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					                                                                                         STEVAL-IFP007V1
                                         16-bit PLC digital input card demonstration board
                                                                       based on the SCLT3
                                                                                                                       Data brief


Features
■   8/16 input channel topology (SCLT3-8
    chip/STEVAL-IFP007V1 board)
■   Fully integrated current limiter
■   Termination for IEC61131-2 type 1 and 3
    inputs
■   Digital filter in each input
■   SPI communication peripheral
■   Voltage regulator integrated on the chip
■   Thermal alarm
■   Wide range supply voltage operation

Description
                                                                                              STEVAL-IFP007V1
The STEVAL-IFP07V1 demonstration board is
based on the SCLT3-8 protected digital input
termination with serialized state transfer, and                               interface and indicates each sensor logic state
allows the user to evaluate the behavior of the                               with an LED.
SCLT3-8 device in industrial environmental
conditions.
The SCLT3-8 is an eight channel termination
used to interface automation digital inputs. It is
designed for 24 VDC applications, and supports
the type 3 input characteristic in accordance with
standard IEC61131-2 (programmable controllers).
The device integrates an SPI peripheral for
communication with logic devices, ASICs and
microcontrollers.
This demonstration board is capable of
transferring not only the data but also additional
information such as thermal alarms, under
voltage indications and parity bits. The STEVAL-
IFP07V1 is ideal for applications with a high
channel count, while the serial communication
reduces the number of lines which, in most final
applications, require galvanic isolation.
The board accommodates two SCLT3-8 chips
connected to the SPI bus in a "daisy-chain"
configuration. It offers a 16-bit digital input


May 2009                                                       Doc ID 15371 Rev 2                                               1/4
For further information contact your local STMicroelectronics sales office.                                            www.st.com     4
                                                                                                                                                                                                                                                                                                                                                                                                                           1




2/4
                                                                                                                                                                                                                                                                                                                                                                                                                                               Circuit schematic




                                                                                                                                                     _SL AV
                                                                                                                                                  SPI_S AVE             L SB
                                                                                                                                                                                                                                                                                                                                                                                                       Figure 1.

                                                                                                                                                                                                 R5 22
                                                                                                                                                                                                 R50 22R
                                                                                                                                                                                                            VDD
                                                                                                                                                                                                            VD
                                                                                                                                                                                                   C1
                                                                                                                                                                                                   33n
                                                                                                                                                                                                   33nF                                                                                                                                                               _MASTER
                                                                                                                                                                                                                                                                                                                                                                   SPI_MASTER to be connected

                                  CN1
                                  CN                                                                                                         U1                                                                                                                                                                                                                           CN10
                                                                                                                                                                                                                                                                                                                                                                          CN1
                                              R1    2k2   IN0   C4
                                                                C40    1n
                                                                       1nF                                                DV
                                                                                                                          DVR           1                                        38          SGND
                                                                                                                                                                                             SGN
                     Input
                      nput   0          1                                                                           R2                        DV
                                                                                                                                              DVR                      VD
                                                                                                                                                                       VDD                                                                                                                                                                                                  1         2
                                              R3    2k2   IN1   C41
                                                                C4     1n
                                                                       1nF                                                              2                                        37
                     Input
                      nput   1    2                                                                                                           OS
                                                                                                                                              OSC                        NC                                                                                                                                                                                                 3         4
                                              R4    2k2   IN2   C4
                                                                C42    1nF
                                                                       1n                                                 SPM           3                                        36
                      nput
                     Input   2          3                                                                           51k                       SPM                        NC                                                                                                                                                                                                 5         6
                                              R5    2k2   IN3   C43
                                                                C4     1n
                                                                       1nF                                                              4                                        35     nCS_SCL
                                                                                                                                                                                        nCS_SC T1
                     Input
                      nput   3    4                                                                                                           COMp
                                                                                                                                              COM                         CS                                                                                                                                                                                                7         8
                                                                                                          SGN
                                                                                                          SGND            VC_U1
                                                                                                                          VC_U          5                                        34     SCK _S
                                                                                                                                                                                        SC _SCL T1
                                                                                                                                              VC                       SC
                                                                                                                                                                       SCK                                                                                                                                                                                                  9        10
                                  ST70 2x2                                                                                VC
                                                                                                                          VCS           6                                        33                                                                               VDD
                                                                                                                                                                                                                                                                  VD                                                          CRO_VC
                                                                                                                                                                                                                                                                                                                           MI CRO_VCC                                                            _u
                                                                                                                                                                                                                                                                                                                                                                                            CL K _uC
                                                                                                                                              VC
                                                                                                                                              VCS                     MOS
                                                                                                                                                                      MOSI                                                                                                                                                                                                  11       12
                                  CN
                                  CN2                                                                                                   7                                        32                                                                                                                                                                          nCS_uC
                                                                                                                                                                                                                                                                                                                                                             nCS_u                             SO_uC
                                                                                                                                                                                                                                                                                                                                                                                            MI SO_u
                                                                                                    R6                                        COMp
                                                                                                                                              COM                     MI SO                                                                                                                                                                                                 13       14
                                              R8    2k2   IN4   C44
                                                                C4     1nF
                                                                       1n                                                 IN0           8                                        31      SD_
                                                                                                                                                                                         SD_0
                      nput
                     Input 4            1                                              VCC                                                    IN1                     MI SO                                                                                             C1
                                                                                                                                                                                                                                                                        C13                                                       C1
                                                                                                                                                                                                                                                                                                                                  C14                                       15       16
                                              R10
                                              R1    2k2   IN5   C4
                                                                C45    1nF
                                                                       1n                                                 IN1           9                                        30
                      nput
                     Input 5      2                                                                 1k0      C4                               IN2                     COMs                                                                                              10uF/6.3V
                                                                                                                                                                                                                                                                        10u /6.3V                                                 10u /6.3V
                                                                                                                                                                                                                                                                                                                                  10uF/6.3V           MI CRO_VC
                                                                                                                                                                                                                                                                                                                                                         CRO_VCC            17       18
                                              R1
                                              R11   2k2   IN6   C4
                                                                C46    1n
                                                                       1nF                                                IN2          10                                        29               R7       15k
                      nput
                     Input 6            3                                                                    33n
                                                                                                             33nF                             IN3                       REF
                                                                                                                                                                        RE                                                                                                                                                                                                  19       20
                                              R1
                                              R12   2k2   IN7   C47
                                                                C4     1nF
                                                                       1n                                                 IN3          11                                        28
                      nput
                     Input 7      4                                                                                                           IN4                        NC
                                                                                                                                       12                                        27       ED
                                                                                                                                                                                        L ED0                                                                                                                                                                                W20
                                                                                                                                                                                                                                                                                                                                                                          ML W20G
                                                                                                                                              COMp
                                                                                                                                              COM                       L D1
                                  ST70 2x2                                                                                IN4          13                                        26               L ED
                                                                                                                                                                                                    ED1                                                           SGND
                                                                                                                                                                                                                                                                  SGN                                                         CRO_GN
                                                                                                                                                                                                                                                                                                                           MI CR GND
                                                                                                                                              IN5                       L D2
                                  CN3
                                  CN                                                                      SGND
                                                                                                          SGN             IN5          14                                        25       ED
                                                                                                                                                                                        L ED2                                                                                                                                                                                                CR GND
                                                                                                                                                                                                                                                                                                                                                                                          MI CRO_GN
                                                                                                                                              IN6                       L D3                                                                                      VDD
                                                                                                                                                                                                                                                                  VD                U5
                                              R1
                                              R13   2k2        C48
                                                          IN8 C4       1n
                                                                       1nF                                                IN6          15                                        24               L ED
                                                                                                                                                                                                    ED3                     R5 220R
                                                                                                                                                                                                                            R52
                     Input
                      nput   8          1                                                                                                     IN7                       L D4                                       SC _S T1
                                                                                                                                                                                                                   SCK _SCL              SCK _O
                                                                                                                                                                                                                                         SC _OPT                               8
                                              R14
                                              R1    2k2        C49
                                                          IN9 C4       1n
                                                                       1nF                                                IN7          16                                        23       ED
                                                                                                                                                                                        L ED4
                      nput
                     Input   9    2                                                                                                           IN8                       L D5                                                                                                 VD
                                                                                                                                                                                                                                                                             VDD                                                                                             SC
                                                                                                                                                                                                                                                                                                                                                                             SCK
                                              R1
                                              R15   2k2    N10 C50
                                                          IN1 C5       1nF
                                                                       1n                                                              17                                        22               L ED
                                                                                                                                                                                                    ED5                                                                                                                      R48
                                                                                                                                                                                                                                                                                                                             R4 330R
                      nput
                     Input   10         3                                                                                                     COM
                                                                                                                                              COMp                      L D6                                                    C19
                                                                                                                                                                                                                                C1                                                                           A1        1                     _uC
                                                                                                                                                                                                                                                                                                                                        CL K _u                   _uC
                                                                                                                                                                                                                                                                                                                                                             CL K _u
                                                                                                                                                                                                                                                                                                                                                                                                                           Circuit schematic




                                              R1
                                              R16   2k2    N11 C51
                                                          IN1 C5       1nF
                                                                       1n                                                              18                                        21       ED
                                                                                                                                                                                        L ED6                                   100pF
                                                                                                                                                                                                                                100p                                                                                                                                             1
                      nput
                     Input   11   4                                                                                                           NC                        L D7                                                                            SC _OPT
                                                                                                                                                                                                                                                        SCK _O                 7
                                                                                                                                       19                                        20                 ED7
                                                                                                                                                                                                  L ED                                                                                                                       R5 330R
                                                                                                                                                                                                                                                                                                                             R59




                                                                                                                                                          C OM p
                                                                                                                                              NC                        L D8                                                                                                Vo1
                                                                                                                                                                                                                                                                            Vo                                         2                                                          poin
                                                                                                                                                                                                                                                                                                                                                                             Test point
                                  ST70 2x2
                                                                                                                                                                                                                                                                                                             C1
                                  CN4
                                  CN
                                                                                                                                                                   SCL    8BT8
                                                                                                                                                                   SC T3- 8BT                                              SGND
                                                                                                                                                                                                                           SGN                                                                                                                   CR GND
                                                                                                                                                                                                                                                                                                                                              MI CRO_GN
                                                                                                                                                                                                                                                                                                                                                                                                       Schematic diagram




                                                                                                                                                         39
                                              R17
                                              R1    2k2    N12 C52
                                                          IN1 C5       1n
                                                                       1nF                                                                                                                                                                                                                                                   R49
                                                                                                                                                                                                                                                                                                                             R4 330R                                         CS
                      nput
                     Input   12         1                                                                                                                                                                                                                                                                    C2        3
                                              R18
                                              R1    2k2    N13 C53
                                                          IN1 C5       1n
                                                                       1nF                                                                                                                                                     R53
                                                                                                                                                                                                                               R5 220R                                                                                                                       nCS_u
                                                                                                                                                                                                                                                                                                                                                             nCS_uC
                      nput
                     Input   13   2                                                                                                                                                                                nCS_SCL
                                                                                                                                                                                                                   nCS_SC T1             nCS_O T
                                                                                                                                                                                                                                         nCS_OP         nCS_OP
                                                                                                                                                                                                                                                        nCS_O T                6                                                                                                 1
                                              R20
                                              R2    2k2    N14 C54
                                                          IN1 C5       1n
                                                                       1nF                                                                                                                                                                                                                                                   R6 330R
                                                                                                                                                                                                                                                                                                                             R60
                      nput
                     Input   14         3                                                                                                                                                                                                                               C2 VoVo2                                       4                   nCS_u
                                                                                                                                                                                                                                                                                                                                           nCS_uC
                                              R21
                                              R2    2k2    N15 C55
                                                          IN1 C5       1n
                                                                       1nF                                                       GN
                                                                                                                                 GND                                                                        SGND
                                                                                                                                                                                                            SGN                                                                                                                                                                   poin
                                                                                                                                                                                                                                                                                                                                                                             Test point
                      nput
                     Input   15   4                                                                                                                                                                                             C2
                                                                                                                                                                                                                                C20                                     100n
                                                                                                                                                                                                                                                                        100nF                                A2
                                                                                                                                                                                                                                100pF
                                                                                                                                                                                                                                100p                                           5               Shi
                                                                                                                                                                                                                                                                                               Shield
                                  ST70 2x2
                                                                                                                                                                                                                                                                             GN
                                                                                                                                                                                                                                                                             GND                                                                                             MI SO
                                                                                                                                                                                                                                                                                                                 73L
                                                                                                                                                                                                                                                                                                        ACP L -K 73                                             SO_uC
                                                                                                                                                                                                                                                                                                                                                             MI SO_u
                                                                             GND
                                                                             GN                                                                                                                                                                                                                                                                                                  1
                                                                                                                                                                                                                           SGND
                                                                                                                                                                                                                           SGN                                    SGND
                                                                                                                                                                                                                                                                  SGN
                                                                                                                                                                                                                                                                                                                                                                                  poin
                                                                                                                                                                                                                                                                                                                                                                             Test point
                                                                                                                                                                                                                                                                                 U6                                       CRO_VC
                                                                                                                                                                                                                                                                                                                       MI CRO_VCC
                                                                                                                                                                                                                                                                 R57
                                                                                                                                                                                                                                                                 R5 330R
                                                                                                                                                                                                                                                      SO_SC
                                                                                                                                                                                                                                                   MI SO_SCL T                 1 A                           VD
                                                                                                                                                                                                                                                                                                             VDD       6
                                                                                                                                                                                                                                                                                                                                                                              CRO
                                                                                                                                                                                                                                                                                                                                                                       GND_MI CR
                                                                                                                                                                                                                                                                                                                                                                CRO_GN
                                                                                                                                                                                                                                                                                                                                                             MI CR GND
                                                                                                                                                                                                                                                                                                                                                                           1
                                                                                                                                                                                                                                                                               2                             Vo        5           SO_u
                                                                                                                                                                                                                                                                                                                                MI SO_uC
                                                                                                                                                                                                                                                                                                                                                                                  poin
                                                                                                                                                                                                                                                                                                                                                                             Test point
                                                                                                                                                                                                                                                                              NC
                                                                      VCC                                                                                                             VDD
                                                                                                                                                                                      VDD4
                                                                                 R43
                                                                                 R4                                                                                                              R51 22R
                                                                                                                                                                                                 R5 22                                                                                                                          C25
                                                                                                                                                                                                                                                                                                                                C2
                                  CN
                                  CN9                                                           VC
                                                                                                VCS
                                                                                                                                                                                                            VD
                                                                                                                                                                                                            VDD                                                  R5 330R
                                                                                                                                                                                                                                                                 R58




Doc ID 15371 Rev 2
                                                                                                                                                                                                                                                                               3           Shi
                                                                                                                                                                                                                                                                                           Shield                      4        100nF
                                                                                                                                                                                                                                                                                                                                100n
                                        1                                        1M5                                                                                                               C18
                                                                                                                                                                                                   C1
                                                                                             R44
                                                                                             R4                                                                                                                                                                                     C                    GN
                                                                                                                                                                                                                                                                                                         GND
                                        2                                                                                                                                                          33n
                                                                                                                                                                                                   33nF
                                                                                             120k                                                                                                                                                                                                          W70L
                                                                                                                                                                                                                                                                                                    ACP L -W70
                                  ST04 2pin                                                                                                                                                                                                                SGN
                                                                                                                                                                                                                                                           SGND                                                           CR GND
                                                                                                                                                                                                                                                                                                                       MI CRO_GN
                                                                                                                                             U2                                                                             R54
                                                                                                                                                                                                                            R5 220R
                                                                                                                                                                                                                   SC _S T2
                                                                                                                                                                                                                   SCK _SCL              SCK _O
                                                                                                                                                                                                                                         SC _OPT
                                                                                                                          DVR
                                                                                                                          DV            1                                        38          SGN
                                                                                                                                                                                             SGND
                                                                                                                    R19
                                                                                                                    R1                        DV
                                                                                                                                              DVR                      VD
                                                                                                                                                                       VDD
                                                                 GN
                                                                 GND    SGND
                                                                        SGN            SGND
                                                                                       SGN                                              2                                        37
                                                                                                                                              OS
                                                                                                                                              OSC                        NC                                                     C21
                                                                                                                                                                                                                                C2
                                                                                                                          SPM           3                                        36                                             100p
                                                                                                                                                                                                                                100pF
                                                                                                                    51k                       SPM                        NC
                                                                                                                                        4                                        35     nCS_SCL
                                                                                                                                                                                        nCS_SC T2
                                                                                                                                              COM
                                                                                                                                              COMp                        CS
                                                                                                          SGN
                                                                                                          SGND            VC_U2
                                                                                                                          VC_U          5                                        34     SCK _S
                                                                                                                                                                                        SC _SCL T2
                                                                                                                                              VC                       SC
                                                                                                                                                                       SCK
                                                                                                                          VC
                                                                                                                          VCS           6                                        33      SD_0f
                                                                                                                                              VC
                                                                                                                                              VCS                     MOS
                                                                                                                                                                      MOSI                                                 SGN
                                                                                                                                                                                                                           SGND
                                                                                                                                        7                                        32
                                                                                                    R22
                                                                                                    R2                                        COMp
                                                                                                                                              COM                     MI SO
                                                                                                                          IN8           8                                        31        SO_SC
                                                                                                                                                                                        MI SO_SCL T                            R55
                                                                                                                                                                                                                               R5 220R
                                                                                       VCC                                                    IN1                     MI SO                                        nCS_SC T2
                                                                                                                                                                                                                   nCS_SCL               nCS_OP
                                                                                                                                                                                                                                         nCS_O T
                                                                                                                          IN9           9                                        30
                                                                                                    1k0      C6                               IN2                     COMs
                                                                       GND_P
                                                                       GND_ WR                                            IN1
                                                                                                                           N10         10                                        29               R2
                                                                                                                                                                                                  R24      15k
                                                                                                             33nF
                                                                                                             33n                              IN3                       REF
                                                                                                                                                                        RE                                                      C22
                                                                                                                                                                                                                                C2
                                                          GND
                                                          GN                                                              IN1
                                                                                                                           N11         11                                        28                                             100pF
                                                                                                                                                                                                                                100p
                                                                             1                                                                IN4                        NC
                                                                                                                                       12                                        27       ED
                                                                                                                                                                                        L ED8
                                                                                                                                              COMp
                                                                                                                                              COM                       L D1
                                                                              point
                                                                         Test poin                                         N12
                                                                                                                          IN1          13                                        26                 ED9
                                                                                                                                                                                                  L ED
                                                                                                                                              IN5                       L D2
                                                                                                          SGND
                                                                                                          SGN             IN1
                                                                                                                           N13         14                                        25     L ED10
                                                                                                                                              IN6                       L D3                                               SGND
                                                                                                                                                                                                                           SGN
                                                                                                                           N14
                                                                                                                          IN1          15                                        24               L ED11
                                                                                                                                              IN7                       L D4
                                                                                                                           N15
                                                                                                                          IN1          16                                        23     L ED12                                 R5 220R
                                                                                                                                                                                                                               R56
                                                                                                                                              IN8                       L D5                                       SD_0f                   SD_
                                                                                                                                                                                                                                           SD_0
                                                                                                                                       17                                        22               L ED13
                                                                                                                                              COM
                                                                                                                                              COMp                      L D6
                                                                                                                                       18                                        21     L ED14
                                                                                                                                              NC                        L D7                                                    C2
                                                                                                                                                                                                                                C23
                                                                                                                                       19                                        20               L ED15




                                                                                                                                                          C OM p
                                                                                                                                              NC                        L D8                                                    100pF
                                                                                                                                                                                                                                100p
                                                                                                                                                                                                                                                                                          solation barrier
                                                                                                                                                                                                                                                                                         Isolation barrie
                                                                                                                                                                   SCL    8BT8
                                                                                                                                                                   SC T3- 8BT




                                                                                                                                                         39
                                                                                                                                                                                                                           SGND
                                                                                                                                                                                                                           SGN

                                                                                                                                 GND
                                                                                                                                 GN           VDD
                                                                                                                                              VDD4                    VDD4
                                                                                                                                                                      VDD                                   SGND
                                                                                                                                                                                                            SGN



                                                                                                                                       DVR
                                                                                                                                       DV         JMP
                                                                                                                                                  JM 1      SPM           JMP
                                                                                                                                                                          JM 2




                                                                                                                                              SGND
                                                                                                                                              SGN                     SGND
                                                                                                                                                                      SGN
                                                                                                                                                                                                                                                                                                                                                                                                                                               STEVAL-IFP007V1
STEVAL-IFP007V1                                                                     Revision history


2        Revision history

         Table 1.     Document revision history
               Date        Revision                              Changes

           17-Feb-2009        1       Initial release.
           05-May-2009        2       Updated picture on cover page and schematic diagram (Figure 1)




                                      Doc ID 15371 Rev 2                                               3/4
                                                                                                                     STEVAL-IFP007V1




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4/4                                                         Doc ID 15371 Rev 2