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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 isbuilt 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.

TimingGenerator

OSCI

VO2

GND

SI

OSCO

BACKWARD

FORWARD

TURBO

VDD

VI1

VO1

VI2

OSCIRX2

1

2

3

4

5

6

7

8 9

10

11

14

13

12

Pin AssignmentReceiver

Block Diagram

LEFT

RIGHT

OSCOOscillator

CounterDecodingCircuit

RIGHT

SI

PLA

15

16

RDB LDB

AMP

LEFTTURBOBACKWARDFORWARD

LatchControlLogic

LDB

RDB

VI1 VO1

VI2 VO2

CS-98046 1 Aug/13/1998V1.2

TimingGenerator

OSCIRIGHTB

TESTB

GND

FORWARDB

SO

VDD

PC

OSCO

OSCI

FOSC

LEFTB

BACKWARDB TX2

1

2

3

4

5

6

7 8

9

10

11

14

13

12

Pin AssignmentTransmitter

Block Diagram

SC

TURBOB

OSCO

TESTB

RIGHTBLEFTB

TURBOBFORWARDB

BACKWARDB

Oscillator

LatchCircuit

EncodingCircuit

LogicPCSOSC

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TX2/RX2

Absolute Maximum Ratings Comments*

Electrical Characteristics

TX2

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

Parameter Symbol Min. Typ. Max.

Operating Voltage VDD 2.4V 4.0V 5.0VOperating Current Idd - - 1mA

Stand-by Current Istb - - 1A

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=25C, 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 DecodingFrequency Variation Ftolerance

-20% - 20%

CS-98046 2 Aug/13/1998V1.2

DC Supply Voltage.....................................0.3V to5.0VInput/Output Voltage...........GND -0.2V to VDD + 0.2VOperating temperature..............................-10C to 60CStorage Temperature..............................-25C to 125C

Never allow a stress to exceed the values listed under"Absolute Maximun Ratings", otherwise the device

would suffer from a permanent damage. Nor is a stressat the listed value be allowed to persist over a period,since an extended exposure to the absolute maximumrating condition may also affect the reliability of thedevice, if not causing a damage thereof.

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TX2/RX2

Pin Description

TX2Pin No. Designation Description

1 RIGHTBThe rightward function will be selected when this pin is connected toGND.

2 TESTB This pin is used for testing purpose only.

3 GND Negative power supply

4 BACKWARDBThe backward function will be selected when this pin is connected toGND.

5 FORWARDBThe forward function will be selected when this pin is connected toGND.

6 TURBOB

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

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.

14 LEFTBThe leftward function will be selected when this pin is connected toGND.

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

Code Format

CS-98046 3 Aug/13/1998V1.2

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TX2/RX2Encode Rule

(A) Bit Format

W1 1KHz 50% Duty cycle

W2500Hz 75% Duty cycle

1KHz

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)

W1Function 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 W2W2 W2W2W2W2

W1 W1W1W1 W1 W11 2 3 4

1 2 3 4 n-th

start code

function code

1 word

CS-98046 4 Aug/13/1998V1.2

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TX2/RX2

Encode/Decode Timing(A)

Any function key

Encode output

Decode output

1st word 2nd word 3rd word 1 32 4 5 6 7 8

end code

9ms 9ms

(B)

8 msec (n) W1 8 msec 1 ms

T

T= 17 ms + (nW1) x 1 ms

SI

Decode output

Typical Application Circuit

Transmitter (TX2 Fosc 128 KHz)

LEFTB FOSC OSCO

TESTB BACKWARDB

TX2

OSCI PC VDD SO

FORWARDB TURBOB SCRIGHTB

2 5 6 7

81011121314

3

B500K

9

GND

1

SI

VCC

R.F.Circuit

GND

4

CS-98046 5 Aug/13/1998V1.2

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TX2/RX2

Receiver (RX2 Fosc 128 KHz)

VI2 VO1 VDD

GND OSCI

RX2

VI1 TURBO FORWARD BACKWARD

OSCO RIGHT LEFTVO2

2 5 6 7 8

1011121314

3

B500K

9

SI

1VCCR.F.

CircuitGND

4

LDB

RDB

1516+

-

4.3V

100F

power switch

Infrared Application CircuitTransmitter

LEFTB FOSC OSCO

TESTB BACKWARDB

TX2

OSCI PC VDD SO

FORWARDB TURBOB SCRIGHTB

2 5 6 7

81011121314

3

9

GND

1 4

+

-DC:3V100 1-4.7

Photo Diode

8050

f=114KHz

Recevier

VI2 VO1 VDD

GND OSCI

RX2

VI1 TURBO FORWARD BACKWARD

OSCO RIGHT LEFTVO2

2 5 6 7 8

1011121314

3

9

SI

1 4

LDB

RDB

1516+

-

f=114KHz

OUT

VDD

57KHzIR Receiver

GND

100 FDC: 5V

1815

100K

CS-98046 6 Aug/13/1998V1.2

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TX2/RX2

Testing Circuit

Fosc for TX2 Fosc, RX2 128 z

TX2

2 5 6 7

81011121314

3

9

1 4

RX2

2 5 6 7 8

1011121314

3

9

1 4

1516+

-100

LEFTB RIGHTB BACKWARDB

FORWARDB

TURBOB

TURBO

FORWARD

BACKWARD

RIGHT LEFT

Bonding Diagram

TX2

RIGHTBTESTBGNDBACKWARDBFORWARDBTURBOBSCSOVDDPCOSCOOSCIFOSCLEFTB

6.8516.0526.5526.5526.5524.957.8-16.7-26.5-26.5-26.5-26.5-26.5-2.35

-25.80-25.80-25.80-14.10-4.9025.7025.725.712.93.7-5.7-15.10-24.2-25.80

about1.5 mm

about 1.6 mm

TX2

Designation X Y

VDD

PC

OSCO

OSCI

LEFTBRIGHTB

SC

FORWARDB

BACKWARDB

SO TURBOB

TESTB GND

FOSC

Note: Substrate is connected to VDD

CS-98046 7 Aug/13/1998V1.2

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TX2/RX2RX2

VO2

GNDNCSIOSCIOSCONCRIGHTLEFTRDBLDBBACKWARDFORWARDTURBONCVDDVI1VO1VI2

-37.90

-37.90

-37.90-28.6-7.45

16.7537.938.238.237.937.923.2

-6.0-28.6-37.90-37.90

3.05

-6.15

-24.55-30.0-30.0

-30.0-23.8-14.6-5.19.922.530.0

30.030.024.5515.35

about3.4 mm

about 4.1 mm

RX2

Designation X Y

VO1

VO2

GND

NC

OSCI OSCO

FORWARD

RDB

LEFT

VI2

LDB

NC RIGHTSI

Note: Substrate is connected to VDD

BACKWARD

VI1 TURBOVDDNC

Unit: in mil

X: 162 Y: 132

REALTEK Semiconductor Corp.

CS-98046 8 Aug/13/1998V1.2

Notice: REALTEK's products are sold by description only, REALTEK reserves the rights to make changes in circuit design and/or specification atany timewithout notice. Accordingly, the reader is cautioned to make sure the latest version of data sheets are available before placing orders.

OFFICE:

3F, NO. 56 WU-KUNG 6 RD.,WU-KU INDUSTRIAL PARK,TAIPEI HSIEN, TAIWAN, R.O.C.TEL:886-2-2980098FAX:886-2-2980097

HEAD OFFICE:

1F, NO. 11, INDUSTRY E. RD. IX,SCIENCE-BASED INDUSTRIAL PARK,HSINCHU, 300 TAIWAN, R.O.C.TEL:886-3-5780211FAX:886-3-5776047