REMOTE CONTROLLER WITH FIVE FUNCTIONS

TX2/RX2





REMOTE CONTROLLER WITH FIVE FUNCTIONS





Features

- Wide operating voltage range: 2.4V to 5.0V

- Low Standby current

- Auto Power-OFF function for TX2

- Few external components needed





General Description

The TX2/RX2 are a pair of CMOS LSIs designed for remote controlled car applications. TX2 is

built with auto Power-OFF function. The TX2/RX2 has five control keys controlling the motions

(i.e. Forward, Backward, Rightward, Leftward and Turbo function) of the remote controlled car.





Pin Assignment Block Diagram

Transmitter TESTB







OSCI Timing

RIGHTB 1 14 LEFTB Oscillator Generator

OSCO

TESTB 2 13 FOSC

GND 3 12 OSCI

RIGHTB

BACKWARDB 4 TX2 11 OSCO

LEFTB PC

FORWARDB 5 10 PC TURBOB Latch Encoding Logic SO

FORWARDB Circuit Circuit SC

TURBOB 6 9 VDD BACKWARDB

SC 7 8 SO









Pin Assignment Block Diagram

Receiver

OSCI

Oscillator Timing

OSCO Generator

VO2 1 16 VI2

GND 2 15 VO1

SI VI1 Decoding

3 14 SI AMP Circuit Counter

OSCI 4 13 VDD

RX2

OSCO 5 12 TURBO

VI1 VO1 P LA

RIGHT 6 11 FORWARD

LEFT 7 10 BACKWARD

RDB VI2 VO2 RIGHT

8 9 LDB LEFT

LDB Latch TURBO

Control BACKWARD

RDB Logic

FORWARD









CS-98046 1 Aug/13/1998

V1.2

TX2/RX2







Absolute Maximum Ratings Comments*



Never allow a stress to exceed the values listed under

DC Supply Voltage.....................................0.3V to 5.0V

"Absolute Maximun Ratings", otherwise the device

Input/Output Voltage...........GND -0.2V to VDD + 0.2V

would suffer from a permanent damage. Nor is a stress at

Operating temperature..............................-10C to 60C

the listed value be allowed to persist over a period, since

Storage Temperature..............................-25C to 125C

an extended exposure to the absolute maximum rating

condition may also affect the reliability of the device, if

not causing a damage thereof.









Electrical Characteristics

TX2



(VDD=4.5V, Fosc = 128KHz, TA=25C, unless otherwise specified.)

Parameter Symbol Min. Typ. Max.

Operating Voltage VDD 2.4V 4.0V 5.0V

Operating Current Idd - - 1mA

Stand-by Current Istb - - 1A

DC O/P Driving Current Idrive 5mA - -

AC O/P Driving Current Idrive 5mA - -

AC O/P Frequency Faudio 500Hz - 1KHz





RX2



(VDD=4.0V, Fosc = 128KHz, TA=25C, unless otherwise specified.)

Parameter Symbol Min. Typ. Max.

Operating Voltage VDD 2.4V 4.0V 5.0V

Operating Current Idd - - 1mA

O/P Driving Current Idrive 1mA - -

O/P Sinking Current Isink 1mA - -

Effect Decoding

Ftolerance -20% - 20%

Frequency Variation









CS-98046 2 Aug/13/1998

V1.2

TX2/RX2





Pin Description

TX2

Pin No. Designation Description

The rightward function will be selected when this pin is connected to

1 RIGHTB

GND.

2 TESTB This pin is used for testing purpose only.

3 GND Negative power supply

The backward function will be selected when this pin is connected to

4 BACKWARDB

GND.

The forward function will be selected when this pin is connected to

5 FORWARDB

GND.

The turbo function will be selected when this pin is connected to

6 TURBOB

GND.

7 SC Output pin of the encoding signal with carrier frequency

8 SO Output pin of the encoding signal without carrier frequency

9 VDD Positive power supply

10 PC Power control output pin

11 OSCO Oscillator output pin

12 OSCI Oscillator input pin

13 FOSC This pin is used for testing mode.

The leftward function will be selected when this pin is connected to

14 LEFTB

GND.



RX2

Pin No. Designation Description

1 VO2 Inverter 2 output pin for power amplify

2 GND Negative power supply

3 SI Input pin of the encoding signal

4 OSCI Oscillator input pin

5 OSCO Oscillator output pin

6 RIGHT Rightward output pin

7 LEFT Leftward output pin

8 RDB Rightward function is disabled when this pin is connected to GND.

9 LDB Leftward function is disabled when this pin is connected to GND.

10 BACKWARD Backward output pin

11 FORWARD Forward output pin

12 TURBO TURBO output pin

13 VDD Positive power supply

14 VI1 Inverter 1 input pin for power amplify

15 VO1 Inverter 1 output pin for power amplify

16 VI2 Inverter 2 input pin for power amplify





CS-98046 3 Aug/13/1998

V1.2

TX2/RX2



Code Format

Encode Rule



(A) Bit Format







1KHz









W1 1KHz 50% Duty cycle







W2

500Hz 75% Duty cycle









Data Format

W2 W2 W2 W2 (n) x W1 W2 W2 W2 W2 (n) x W1 W2 W2 W2 W2



Number of Function Codes (n) W1 Function Key Decode Result

4 End Code

10 Forward Forward

16 Forward & Turbo Forward

22 Turbo Turbo

28 Turbo & Forward & Left Forward & Left

34 Turbo & Forward & Right Forward & Right

40 Backward Backward

46 Backward & Right Backward & Right

52 Backward & Left Backward & Left

58 Left Left

64 Right Right









W2 W2 W2 W2 W2 W2 W2 W2



1 2 3 4 W1 W1 W1 W1 W1 W1

1 2 3 4 n-th



start code

function code





1 word









CS-98046 4 Aug/13/1998

V1.2

TX2/RX2

Encode/Decode Timing

(A)





Any function key









1st word 2nd word 3rd word 1 2 3 4 5 6 7 8

Encode output

end code







Decode output







9ms 9ms







(B)





SI



8 msec (n) W1 8 msec 1 ms







Decode output





T





T= 17 ms + (nW1) x 1 ms









Typical Application Circuit

Transmitter (TX2 Fosc  128 KHz)









B500K



VCC

SI R.F.

14 13 12 11 10 9 8 Circuit

LEFTB FOSC OSCI OSCO PC VDD SO GND





TX2

RIGHTB TESTB GND BACKWARDB FORWARDB TURBOB SC

1 2 3 4 5 6 7









CS-98046 5 Aug/13/1998

V1.2

TX2/RX2



Receiver (RX2 Fosc  128 KHz)





power switch







+ 16 15 14 13 12 11 10 9

100 F - VI2 VO1 VI1 VDD TURBO FORWARD BACKWARD LDB





4.3V RX2

VO2 GND SI OSCI OSCO RIGHT LEFT RDB

VCC 1 2 3 4 5 6 7 8

R.F.

Circuit

GND

B500K









Infrared Application Circuit

Transmitter



+

DC:3V 100  1-4.7 

-





f=114KHz

P hoto Diode





14 13 12 11 10 9 8

LEFTB FOSC OSCI OSCO PC VDD SO





TX2

RIGHTB TESTB GND BACKWARDB FORWARDB TURBOB SC

1 2 3 4 5 6 7

8050









Recevier





100K



VDD

+ 16 15 14 13 12 11 10 9

OUT 57KHz

DC: 5V - 100  F VI2 VO1 VI1 VDD TURBO FORWARD BACKWARD LDB

IR Receiver

1815 GND

RX2

VO2 GND SI OSCI OSCO RIGHT LEFT RDB

1 2 3 4 5 6 7 8



f=114KHz









CS-98046 6 Aug/13/1998

V1.2

TX2/RX2





Testing Circuit

Fosc for TX2 Fosc, RX2 z



FORWARD

TURBO BACKWARD









14 13 12 11 10 9 8 16 15 14 13 12 11 10 9

+

100  -

TX2 RX2



1 2 3 4 5 6 7 1 2 3 4 5 6 7 8









LEFTB RIGHTB BACKWARDB TURBOB RIGHT LEFT

FORWARDB









Bonding Diagram

TX2





Designation X Y



SO SC TURBOB RIGHTB 6.85 -25.80

TESTB 16.05 -25.80

GND 26.55 -25.80

BACKWARDB 26.55 -14.10

FORWARDB 26.55 -4.90

TURBOB 24.95 25.70

SC 7.8 25.7

SO -16.7 25.7

VDD -26.5 12.9

PC -26.5 3.7

OSCO -26.5 -5.7

OSCI -26.5 -15.10

about VDD FOSC -26.5 -24.2

1.5 mm

TX2 LEFTB -2.35 -25.80



PC

FORWARDB





OSCO

BACKWARDB

Note: Substrate is connected to VDD

OSCI

RIGHTB

LEFTB TESTB GND

FOSC







about 1.6 mm









CS-98046 7 Aug/13/1998

V1.2

TX2/RX2

RX2





Designation X Y



VO2 -37.90 3.05

VI1 NC VDD TURBO GND -37.90 -6.15

VO1 NC

FORWARD SI -37.90 -24.55

OSCI -28.6 -30.0

OSCO -7.45 -30.0

VI2 BACKWARD NC

RIGHT 16.75 -30.0

LEFT 37.9 -23.8

RDB 38.2 -14.6

LDB 38.2 -5.1

BACKWARD 37.9 9.9

FORWARD 37.9 22.5

TURBO 23.2 30.0

about VO2 RX2 LDB

NC

3.4 mm -6.0 30.0

VDD

VI1 -28.6 30.0

RDB VO1 -37.90 24.55

GND VI2 -37.90 15.35



LEFT

NC

Unit: in mil

X: 162 Y: 132

SI

OSCI OSCO NC RIGHT

Note: Substrate is connected to VDD









about 4.1 mm









Notice: REALTEK's products are sold by description only, REALTEK reserves the rights to make changes in circuit design and/or specification at

any time

without notice. Accordingly, the reader is cautioned to make sure the latest version of data sheets are available before placing orders.





REALTEK Semiconductor Corp.





HEAD OFFICE: OFFICE:



1F, NO. 11, INDUSTRY E. RD. IX, 3F, NO. 56 WU-KUNG 6 RD.,

SCIENCE-BASED INDUSTRIAL PARK, WU-KU INDUSTRIAL PARK,

HSINCHU, 300 TAIWAN, R.O.C. TAIPEI HSIEN, TAIWAN, R.O.C.

TEL:886-3-5780211 TEL:886-2-2980098

FAX:886-3-5776047 FAX:886-2-2980097









CS-98046 8 Aug/13/1998

V1.2