currency exchange calculator currency exchange calculator by BeunaventuraLongjas

VIEWS: 347 PAGES: 5

More Info
									8 digits LCD Currency Exchange Calculator                                                  A6680-05

General Description

   The A6680-05 is a CMOS LSI specially designed for 8-digits currency exchange calculation.
Besides the normal standard calculating (+, -, *, ? , percentage) and auto power-off functions, it has
the operations of currency exchange rate storage and exchange calculation. With fixing the exchange
calculation result to 2 decimal points, it gives a more practical currency exchange function. It is
designed for 1/2 bias, 1/3 duty cycle LCD with a 1.5V power supply.

Features

. Four standard functions (+, -, *, ? )
. Currency exchange rate storage after confirmation
. Multiplied by the stored rate
. Divided by the stored rate
. Mark-up and mark-down calculations
. Percentage calculations
. Chain multiplication and division
. Power calculations
. Rough estimate calculations
. Auto power off selectable

PAD Configuration

    25 24 23 22 21 20 19 18 17 16 15 14 13 12
          A7 C6 B6 A6 C5 B5 A5 C4 B4 A4 C3 B3
  26 B7
                                        A3 11
  27 C7
                                         C2 10
  28 A8
                                         B2 9
  29 B8
                                         A2 8
  30 C8
                                         C1 7
  31 H2            A6680-05
                                         B1 6
  32 H3         2.1mm? 2.2mm
                                         A1 5
  33
                                         H1 4
  34 GND
                                       VGG 3
  35 VCC
                                         S2 2
  36 VA
                                         S1 1
  37 VB
 38 39 40 41 42 43 44 45 46 47 48 49 50
 CG1 CG K3 K2 KA2KA3KA4KA5P2 P1 K5 K6 K4

 *Substrate should be connected to GND,




                                                 1                           DS-A6680-05-001
8 digits LCD Currency Exchange Calculator                                                   A6680-05

Pin Assignment

 No.     Name               Description               No.     Name        Description
  1       S1                    Test                  26       B7       Display output
  2       S2                APO input                 27       C7       Display output
  3      VGG               Power Supply               28       A8       Display output
  4       H1               Display output             29       B8       Display output
  5       A1               Display output             30       C8       Display output
  6       B1               Display output             31       H2       Display output
  7       C1               Display output             32       H3       Display output
  8       A2               Display output             33      NC3       No connection
  9       B2               Display output             34      GND           Ground
 10       C2               Display output             35      VCC      Capacitor terminal
 11       A3               Display output             36       VA      Capacitor terminal
 12       B3               Display output             37       VB      Capacitor terminal
 13       C3               Display output             38      CGI      Resistor terminal
 14       A4               Display output             39       CG      Resistor terminal
 15       B4               Display output             40       K3          Key input
 16       C4               Display output             41       K2          Key input
 17       A5               Display output             42      KA2        Strobe output
 18       B5               Display output             43      KA3        Strobe output
 19       C5               Display output             44      KA4        Strobe output
 20       A6               Display output             45      KA5        Strobe output
 21       B6               Display output             46       P2        Strobe output
 22       C6               Display output             47       P1        Strobe output
 23       A7               Display output             48       K5          Key input
 24      NC1               No connection              49       K6          Key input
 25      NC2               No connection              50       K4          Key input


Absolute Maximum Rating

          ITEMS                    SYMBOL                RATING               UNIT
DC Supply Voltage                    VGG                  1.2~1.8              V
Input Voltage                        Vin              -0.3~ VGG +0.3           V
Operating Temperature                Topr                 0~+40                ?C
Storage Temperature                  Tstor               -10~+80               ?C
Note 1. Maximum voltage on any pin with respect to the GND.




DC characteristics
                                                  2                         DS-A6680-05-001
8 digits LCD Currency Exchange Calculator                                                           A6680-05


VGG = 1.5V, Vss =0V, Ta = 25?C unless otherwise specified.
        ITEMS            SYMB.        CONDITION                       MIN.         TYP.     MAX.      UNIT
   Operating Voltage       VGG                                         1.2          1.5      1.8        V
         Power             SIGG         Display Off                                 0.1      0.5       µA
       Dissipation         DIGG          Operating                                  4.5      8.0       µA

Input Voltage
       Low level              Vil                                                             0.4       V
       High level             Vih                                    VGG-0.4                            V
Output Voltage
VA, VB, VC, Segments          Voa              No load                  2.8                             V
          and                 Vob              No load                  1.3                   1.7       V
       Commons                Voc              No load                                        0.2       V
Keyboard pins
      Low level               Vol             Iol=15µA                                       0.15       V
      High level              Voh                                   VGG-0.15                            V
    Display Freq.             Fo           VGG=1.3V while              40                               Hz
                                            display is on

LCD connector




              RATE
              LC
              FC

                 H2 H3 C8 B8 A8 C7 B7 A7 C6 B6 A6 C5 B5 A5 C4 B4 A4 C3 B3 A3 C2 B2 A2 C1 B1 A1 H1



       RATE
       LC
    H1 FC

    H2
                  C8 B8A8 C7 B7A7C6 B6A6 C5 B5A5 C4 B4A4C3 B3A3C2 B2A2C1 B1A1
    H3




                                                  3                                DS-A6680-05-001
8 digits LCD Currency Exchange Calculator                                                A6680-05

Application Circuit (for use with a battery)

?


           RATE
           LC
           FC




                    25 24 23 22 21 20 19 18 17 16 15 14 13 12
                          A7 C6 B6 A6 C5 B5 A5 C4 B4 A4 C3 B3
                   26 B7
                                                        A3 11
                   27 C7
                                                        C2 10
                   28 A8
                                                         B2 9
                   29 B8
                                                         A2 8
                   30 C8
                                                         C1 7
                   31 H2
                                     A6680-05            B1 6
                   32 H3
                                                         A1 5
                   33
                                                         H1 4
                   34 GND
    0.1u                                               VGG 3                            33u optional
                   35 VCC
                                                                         1.5V
                                                         S2 2
                   36 VA
            0.1u                                         S1 1
                   37 VB
                    38 39 40 41 42 43 44 45 46 47 48 49 50
                   CG1 CG K3 K2 KA2KA3KA4KA5P2 P1 K5 K6 K4
                                                                                 Auto power off
                                                                                    condition

                      3       6        -         +        ?      ON/AC          Pin    APO      APO
                                                                                      Enable   Disable
                      2       5        9                  ?       OFF           S1      L        H
                                                                                S2      H         L
                      1       4        8       LC? FC   FC? LC   ON/CE

                     STO      .                          +/-

                      0     CHK        7         %        =



* Substrate should be connected to GND.

Operation Description
                                                 4                       DS-A6680-05-001
8 digits LCD Currency Exchange Calculator                                                     A6680-05


 ?
? Use key 0~9, ? , ? , ? , ? , ? … for standard arithmetic calculation.
 ?
? Press key STO, blink the LCD display to indicate that the current value will be stored as
   currency exchange rate. Press key STO again to confirm the storage operation and other key to
   cancel it.
 ?
? Press key CHK to display the stored exchange rate.
 ?
? Use key “ ? LC”to multiply the current value by the stored rate and switch on the LCD
              FC
   symbol LC. No response to consecutive operations on this key.
 ?
? Use key “ ? FC”to divide the current value by the stored rate and switch on the LCD
              LC
   symbol FC. No response to consecutive operations on this key.
 ?
? Symbols:                  ? : negative number.
                            E: error.
                       RATE: exchange rate indicator. *
                           LC: local currency indicator.
                           FC: foreign currency indicator.


* RATE is defined as the rate of ONE foreign currency (FC) to how many local currency (LC).




                                                    5                              DS-A6680-05-001

								
To top