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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 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
Transmitter
Block Diagram
T EST B
OSCI
RIGHT B
1
14
LEFT B
T EST B
2
13
FOSC
GND
3
12
OSCI
BACKWARDB
4
11
OSCO
FORWARDB
5
10
PC
T URBOB
6
9
VDD
SC
7
8
SO
TX2
Pin Assignment
Receiver
T iming
Generator
Oscillator
OSCO
RIGHT B
LEFT B
T URBOB
FORWARDB
BACKWARDB
Latch
Circuit
Encoding
Circuit
Logic
PC
SO
SC
Block Diagram
OSCI
VO2
1
16
VI2
GND
2
15
VO1
SI
3
14
VI1
OSCI
4
13
VDD
OSCO
5
12
T URBO
RIGHT
6
11
FORWARD
LEFT
7
10
BACKWARD
RDB
8
9
RX2
LDB
T iming
Generator
Oscillator
OSCO
AMP
SI
VI1
VO1
VI2
VO2
Decoding
Circuit
PLA
LDB
RDB
CS-98046
V1.2
1
Counter
Control
Logic
Latch
RIGHT
LEFT
T URBO
BACKWARD
FORWARD
Aug/13/1998
TX2/RX2
Absolute Maximum Ratings
Comments*
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 stress at
the listed value be allowed to persist over a period, since
an extended exposure to the absolute maximum rating
condition may also affect the reliability of the device, if
not causing a damage thereof.
DC Supply Voltage.....................................0.3V to 5.0V
Input/Output Voltage...........GND -0.2V to VDD + 0.2V
Operating temperature..............................-10C to 60C
Storage Temperature..............................-25C to 125C
Electrical Characteristics
TX2
(VDD=4.5V, Fosc = 128KHz, TA=25C, unless otherwise specified.)
Parameter
Symbol
Min.
Operating Voltage
VDD
2.4V
Operating Current
Idd
Stand-by Current
Istb
DC O/P Driving Current
Idrive
5mA
AC O/P Driving Current
Idrive
5mA
AC O/P Frequency
Faudio
500Hz
Typ.
4.0V
-
Max.
5.0V
1mA
1A
1KHz
Typ.
4.0V
-
Max.
5.0V
1mA
-
-
20%
RX2
(VDD=4.0V, Fosc = 128KHz, TA=25C, unless otherwise specified.)
Parameter
Symbol
Min.
Operating Voltage
VDD
2.4V
Operating Current
Idd
O/P Driving Current
Idrive
1mA
O/P Sinking Current
Isink
1mA
Effect Decoding
Ftolerance
-20%
Frequency Variation
CS-98046
V1.2
2
Aug/13/1998
TX2/RX2
Pin Description
TX2
Pin No.
Designation
1
RIGHTB
2
3
TESTB
GND
4
BACKWARDB
5
FORWARDB
6
TURBOB
7
8
9
10
11
12
13
SC
SO
VDD
PC
OSCO
OSCI
FOSC
14
LEFTB
RX2
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Designation
VO2
GND
SI
OSCI
OSCO
RIGHT
LEFT
RDB
LDB
BACKWARD
FORWARD
TURBO
VDD
VI1
VO1
VI2
CS-98046
V1.2
Description
The rightward function will be selected when this pin is connected to
GND.
This pin is used for testing purpose only.
Negative power supply
The backward function will be selected when this pin is connected to
GND.
The forward function will be selected when this pin is connected to
GND.
The turbo function will be selected when this pin is connected to
GND.
Output pin of the encoding signal with carrier frequency
Output pin of the encoding signal without carrier frequency
Positive power supply
Power control output pin
Oscillator output pin
Oscillator input pin
This pin is used for testing mode.
The leftward function will be selected when this pin is connected to
GND.
Description
Inverter 2 output pin for power amplify
Negative power supply
Input pin of the encoding signal
Oscillator input pin
Oscillator output pin
Rightward output pin
Leftward output pin
Rightward function is disabled when this pin is connected to GND.
Leftward function is disabled when this pin is connected to GND.
Backward output pin
Forward output pin
TURBO output pin
Positive power supply
Inverter 1 input pin for power amplify
Inverter 1 output pin for power amplify
Inverter 2 input pin for power amplify
3
Aug/13/1998
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
4
10
16
22
28
34
40
46
52
58
64
W2
W2
W2
1
2
3
Function Key
Forward
Forward & Turbo
Turbo
Turbo & Forward & Left
Turbo & Forward & Right
Backward
Backward & Right
Backward & Left
Left
Right
W2
4
Decode Result
End Code
Forward
Forward
Turbo
Forward & Left
Forward & Right
Backward
Backward & Right
Backward & Left
Left
Right
W2
W1
W1
W1
W1
W1
1
2
3
4
n-th
W2
W2
W2
W1
start code
function code
1 word
CS-98046
V1.2
4
Aug/13/1998
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
(n) W1
8 msec
8 msec
1 ms
Decode output
T
T = 17 ms + (nW1) x 1 ms
Typical Application Circuit
Transmitter (TX2 Fosc  128 KHz)
B500K
14
LEFT B
13
FOSC
12
OSCI
11
OSCO
10
9
PC
SI
8
SO
VDD
VCC
R.F.
Circuit
GND
TX2
RIGHT B
1
CS-98046
V1.2
T EST B
2
GND
3
BACKWARDB
FORWARDB
5
4
5
T URBOB
6
SC
7
Aug/13/1998
TX2/RX2
Receiver (RX2 Fosc  128 KHz)
power switch
16
VI2
+
-
100 F
13
VDD
14
VI1
15
VO1
12
T URBO
10
BACKWARD
11
FORWARD
9
LDB
RX2
4.3V
VO2
VCC
R.F.
Circuit
GND
GND
1
2
SI
OSCI
3
4
OSCO
RIGHT
LEFT
RDB
6
7
8
5
B500K
Infrared Application Circuit
Transmitter
DC:3V
+
100 
-
1-4.7 
f=114KHz
Photo Diode
13
FOSC
14
LEFT B
11
OSCO
12
OSCI
10
9
PC
8
SO
VDD
TX2
RIGHT B
1
T EST B
BACKWARDB
GND
2
3
FORWARDB
T URBOB
5
4
SC
6
7
8050
Recevier
100K
VDD
DC: 5V
+
- 100  F
16
VI2
15
VO1
14
VI1
13
VDD
12
T URBO
11
FORWARD
10
BACKWARD
9
LDB
OUT 57KHz
IR Receiver
1815
GND
RX2
VO2
1
GND
2
SI
OSCI
3
4
OSCO
5
RIGHT
LEFT
RDB
6
7
8
f=114KHz
CS-98046
V1.2
6
Aug/13/1998
TX2/RX2
Testing Circuit
Fosc for TX2 Fosc, RX2 z
FORWARD
T URBO
100 
14
+
-
13
12
11
10
9
16
8
15
14
13 12
TX2
1
LEFT B
2
3
4
BACKWARD
11
10
9
6
7
8
RX2
5
6
1
7
2
RIGHT B BACKWARDB T URBOB
FORWARDB
3
4
5
RIGHT LEFT
Bonding Diagram
TX2
Designation
SC
SO
about
1.5 mm
VDD
T URBOB
TX2
PC
RIGHT B
T EST B
GND
BACKWARDB
FORWARDB
T URBOB
SC
SO
VDD
PC
OSCO
OSCI
FOSC
LEFT B
X
6.85
16.05
26.55
26.55
26.55
24.95
7.8
-16.7
-26.5
-26.5
-26.5
-26.5
-26.5
-2.35
Y
-25.80
-25.80
-25.80
-14.10
-4.90
25.70
25.7
25.7
12.9
3.7
-5.7
-15.10
-24.2
-25.80
FORWARDB
OSCO
BACKWARDB
Note: Substrate is connected to VDD
OSCI
LEFT B
RIGHT B
T EST B
GND
FOSC
about 1.6 mm
CS-98046
V1.2
7
Aug/13/1998
TX2/RX2
RX2
Designation
VO1
VI1
NC
VDD
T URBO
FORWARD
VI2
about
3.4 mm
BACKWARD
RX2
VO2
LDB
RDB
GND
Y
-37.90
-37.90
3.05
-6.15
-37.90
-28.6
-7.45
-24.55
-30.0
-30.0
16.75
37.9
38.2
38.2
37.9
37.9
23.2
-30.0
-23.8
-14.6
-5.1
9.9
22.5
30.0
-6.0
-28.6
-37.90
-37.90
30.0
30.0
24.55
15.35
LEFT
NC
SI
VO2
GND
NC
SI
OSCI
OSCO
NC
RIGHT
LEFT
RDB
LDB
BACKWARD
FORWARD
T URBO
NC
VDD
VI1
VO1
VI2
X
Unit : in mil
X: 162 Y: 132
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,
SCIENCE-BASED INDUSTRIAL PARK,
HSINCHU, 300 TAIWAN, R.O.C.
TEL:886-3-5780211
FAX:886-3-5776047
3F, NO. 56 WU-KUNG 6 RD.,
WU-KU INDUSTRIAL PARK,
TAIPEI HSIEN, TAIWAN, R.O.C.
TEL:886-2-2980098
FAX:886-2-2980097
CS-98046
V1.2
8
Aug/13/1998