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Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
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Features
General Description
• PT8A977P/977W works as encoder and
The PTA977P (or 977W) and PT8A978P (or 978LW)
PT8A978P/978LW works as decoder
provide a complete control functions to the remote-
• Five pins for five control functions
controlled toy. The PT8A977P/977W has five input
• Operating power-supply voltage: 2.5V to 5.0V pins corresponding with the five function buttons i.e,
(977P, 977W, 978P), 2.0V to 5.0V (978LW)
forward, backward, rightward, leftward and turbo. The
• Auto-power-off if no press on any button in 8s or encoding circuit in the PT8A977P/977W sends digital
continuously press on any button over 4 minues codes to the two output pins SO and SC. The digital
• Press on any button as wake up (977P, 977W)
codes correspond to the definite function buttons or
• Manual-power-off with OFF button
their combinations. The SO and SC outputs are used
• One output pin used for external power control (977P, in wireless and infra-red applications respectively.
977W)
• On-chip oscillator with an external resistor
The PT8A978P (or 978LW) has five output pins
• On-chip reversing amplifiers (978P, 978LW)
corresponding with the five actions. The received
• Low operating current
signals are amplified by the three-stage amplifier, and
• Few external components needed
then the appropriate amplified signals are sampled,
• Package: 14-pin DIP, 14-pin SOIC, 16-pin DDaItPaSheet4faUu.clto-mtolerantly checked and decoded to control the
and 16-pin SOIC
actions of the remote-controlled toy.
DataShee
Ordering Information
Par t No.
Package
PT8A977P
14-pin DIP
PT8A977W
14-pin SOIC
PT8A978P
16-pin DIP
PT8A978LW
16-pin SOIC
There is an internal oscillator in the PT8A977P/977W
and 978P/978LW respectively. By adding an external
resistor conveniently, the oscillator will be
constructed. The oscillator frequency can be adjusted
by the external resistor. The relative error between
the frequencies of the two on-chip oscillators in the
PT8A977P/977W and PT8A978P/978LW must be
less than ±25%.
The auto-power-off function is achieved by an internal
counter. The PC output is used to control on/off state
of the external power supply. Pressing OFF button
can also shut down the power supply. Press on any
function button will wake up the chip promptly.
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Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
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Block Diagram
Block Diagram of 977P/977W
OFF
OSCI
OSCO
Oscillator
Timing
Generator
4 Minutes
Counter
PC
Right
Left
Turbo
Forward
Backward
Input
Circuit
Encoding
Circuit
Output
Circuit
SO
SC
Block Diagram of 978P/978LW
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OSCI
OSCO
SI
VI1
Oscillator
Timing
Generator
Latch
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Amp.
Signal Sample &
Fault-Tolerant
Check
Decoding
Circuit
Amp.
VO1
VI2 Amp.
VO2
Output
Circuit
Control
Logic
Right
Left
Turbo
Forward
Backward
LD
RD
DataShee
Pin Configuration
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PT8A977P/977W
14-Pin DIP/14-Pin SOIC
PT8A978P/978LW
16-Pin DIP/16-pin SOIC
Right
Test
GND
Backward
Forward
Turbo
SC
1
2
3
4
5
6
7
14 Left
13 OFF
12 OSCI
11 OSCO
10 PC
9V
CC
8 SO
VO2
GND
SI
OSCI
OSCO
Right
Left
RD
1
2
3
4
5
6
7
8
16 VI2
15 VO1
14 VI1
13 V
CC
12 Turbo
11 Forward
10 Backward
9 LD
Top View
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Data Sheet
PT8A977P/977W/978P/978LW
5-Function Remote Controller
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Pin Description
Pin Description of 977P/977W
Pin No.
Pin Name
1 Right
2 Test
3 GND
4 Backward
5 Forward
6 Turbo
7 SC
8 SO
9 Vcc
10 PC
11 OSCO
12 OSCI
13 OFF
14 Left
Description
With Pull-up resistor, rightward function selected if this pin connected to GND.
With Pull-up resistor, this pin is used for testing mode.
Negative power supply
With Pull-up resistor, backward function selected if this pin connected to GND.
With Pull-up resistor, forward function selected if this pin connected to GND.
With Pull-up resistor, turbo function selected if this pin 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
With Pull-up resistor, this pin is used to shut down the external power supply.
With Pull-up resistor, leftward function selected if this pin connected to GND.
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Pin Description of 978P/978LW
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
VO2
GND
SI
OSCI
OSCO
Right
Left
RD
LD
Backward
Forward
Turbo
Vcc
VI1
VO1
VI2
Description
Output pin for the amplifier 2
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Input pin of the encoding signal
Oscillator input pin
Oscillator output pin
Rightward output pin
Leftward output pin
With Pull-up resistor, rightward function disabled if this pin connected to GND.
With Pull-up resistor, leftward function disabled if this pin connected to GND.
Backward output pin
Forward output pin
Turbo output pin
Positive power supply
Input pin for the amplifier 1
Output pin for the amplifier 1
Input pin for the amplifier 2
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