tx2rx2
TRANSCRIPT
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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