Data Sheet
PT8A971AP/972AP
5-Function Remote Controller
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Features
• The PT8A971AP works as the encoder and the
PT8A972AP works as the decoder
• Five pins for five control functions
• Operating power supply voltage: 2.5 to 5.0V
• Auto-power-off if no press on any button in 8s or
continuously press on any button over 4 minutes
(971AP)
• Press on any button to wake up
• Manual-power-off with OFF button (971AP)
• One output pin used for external power control
• On-chip oscillator with an external resistor
• Low operating current
• Few external components needed
• Package: 14-pin DIP (971AP) and 16-pin DIP
(972AP)
LSIs designed to provide a complete control functions
to remote-controlled toy. The PT8A971AP has five
input pins corresponding with the five function
buttons - forward, backward, right, left and turbo. The
encoding circuit in the PT8A971AP sends digital
codes to the two output pins SO and SC. The digital
codes correspond to the definite function buttons and
their combinations. The SO and SC outputs are used
in wireless and infrared applications respectively.
There is an internal oscillator in the PT8A971AP and
PT8A972AP respectively. The oscillator frequency
can be adjusted by the external resistor. The relative
error between the frequencies of the two on-chip
oscillators in the PT8A971AP and PT8A972AP must
be less than ±25%.
The auto-power-off function is achieved by internal
counters. Pressing OFF button can also shut down
the power supply. Press on any function button will
wake up the chip promptly.
General Description
The PT8A971AP and PT8A972AP is a pair of CMOS
Block Diagram
Block Diagram of PT8A971AP
OFF
OSCI
Oscillator
OSCO
Timing
Generator
4 Minutes
Counter
PC
Right
Left
Turbo
Forward
Backward
Input
Circuit
Encoding
Circuit
Output
Circuit
SO
SC
PT0066(28/08/01)
1
Ver:0
Data Sheet
PT8A971AP/972AP
5-Function Remote Controller
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Block Diagram of PT8A972AP
ON/OFF
OSCI
Oscillator
OSCO
Timing
Generator
5 Minutes
Counter
Power
Control
PC
SI
Amp.
Sig. Sample &
Fault-Tolerant
Check
VO1
Decoding
Circuit
Right
Left
Output
Circuit
Latch
Turbo
Forward
Backward
VI1
Amp.
VI2
Amp.
VO2
Pin Configuration
PT8A971AP
14-Pin PDIP
OFF
Backward
GND
Forward
NC
Turbo
SC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Top View
Top View
Right
Left
OSCI
OSCO
PC
V
CC
SO
VI2
VO2
SI
OSCI
OSCO
PC
ON/OFF
Right
PT8A972AP
16-Pin PDIP
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
GND
VO1
VI1
V
CC
Turbo
Forward
Backward
Left
PT0066(28/08/01)
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Ver:0
Data Sheet
PT8A971AP/972AP
5-Function Remote Controller
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Pin Description
Pin Description of PT8A971AP
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Na me
O FF
Backward
GND
Forward
NC
Turbo
SC
SO
V
CC
PC
O SC O
O SC I
Left
Right
I
O
O
P
O
O
I
I
I
Type
I
I
GND
I
De s cr ipt ion
Cuts off external power supply to the PT8A971A when Low.
Backward function selected if this pin connected to GND, with pull- up resistor.
Ground
Forward function selected if this pin connected to GND, with pull- up resistor.
No Connection
Turbo function selected if this pin connected to GND, with pull- up resistor.
Output pin of the encoding signal with carrier frequency
Output pin of the encoding signal without carrier frequency
Power supply
Power control output pin
Oscillator output pin
Oscillator input pin
Leftward function selected if this pin connected to GND, with pull- up resistor.
Rightward function selected if this pin connected to GND, with pull- up resistor.
Pin Description of PT8A972AP
Pin No
1, 14
2, 15
3
4
5
6
7
8
9
10
11
12
13
16
PT0066(28/08/01)
Pin Na me
VI2, VI1
VO2, VO1
SI
O SC I
O SC O
PC
ON/OFF
Right
Left
Backward
Forward
Turbo
V
CC
GND
Type
I
O
I
I
O
O
I
O
O
O
O
O
P
GND
Input pins of amplifiers 1 and 2
Output pins of amplifiers 1 and 2
Input pin for encoded signal
Oscillator input pin
Oscillator output pin
Power Control output pin
On/Off pin
Right output pin
Left output pin
Backward output pin
Forward output pin
Turbo output pin
Power supply
Ground
De s cr ipt ion
3
Ver:0
Data Sheet
PT8A971AP/972AP
5-Function Remote Controller
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Code Format
(W1 is for function codes and W2 for start codes)
W1
W1: 1kHz 50% Duty Cycle (Typical)
W2
W2: 500Hz 75% Duty Cycle (Typical)
Word Format
Start Code: 4 x W2
1 Word
Function Code: n x W1
Encoding and Decoding Timing
Encoding String:
W2, W2, W2, W2, (n)xW1, W2, W2, W2, W2, (n)xW1, W2, W2, W2, W2, (n)xW1, ... ...
Press Any Button
on PT8A971AP
Encoding Output
from PT8A971AP
1st word 2nd word
last word
Function Codes
1
2
3
14 15
End Codes
Decoding Output
from PT8A972AP
9ms
9ms
PT0066(28/08/01)
4
Ver:0
Data Sheet
PT8A971AP/972AP
5-Function Remote Controller
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Encoding Input and Decoding Result
Number of Function Codes (n) W1
4±1
10 ± 1
16 ± 1
22 ± 1
28 ± 1
34 ± 1
40 ± 1
46 ± 1
52 ± 1
58 ± 1
64 ± 1
End Code
Forward (Pulse)
Forward (High level)
Turbo
Forward (High level) & Left
Forward (High level) & Right
Backward
Backward & Right
Backward & Left
Left
Right
Decoding Results
PC Output Timing
PC Timing of PT8A971AP
V
CC
OFF
PC
8s
V
CC
OFF
PC
£
8s
Note:
Pins 2, 4, 6, 13 and 14 are High.
V
CC
Pins 2, 4, 6, 13, 14
PC
8s
8s
4 min
PC Timing of PT8A972AP
V
CC
ON/OFF
SI
PC
5 minutes
PT0066(28/08/01)
5 minutes
5
Ver:0
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