Data Sheet
PT8A977B/9781 5-Function Remote
Controller for 1V Micro Cars
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Features
• PT8A977B works as encoder and PT8A9781
works as decoder
• Four control functions
• Operating power-supply voltage: 1.8V to 5.0V(977B)
1.0V to 1.5V (9781)
• Auto-power-off and oscillation-off if no press on
any button (977B)
• Press on any button to wake up (977B)
• On-chip oscillator with an external resistor (977B)
• On-chip oscillator with an external resistor and
capacitor (9781)
• On-chip amplifiers (9781)
• Low operating current
• Few external components needed
General Description
The PT8A977B and PT8A9781 provide a complete
control functions to the remote-controlled toy. The
PT8A9781 has four output pins corresponding with
the four actions i.e, forward, backward, right, left.
The received signals are amplified by the three-stage
amplifier, and then the appropriate amplified signals
are sampled, fault-tolerantly checked and decoded
to control the actions of the remote-controlled toy.
There is an internal oscillator in the PT8A9781. By
adding an external resistor and capacitor conveniently,
the oscillator will be constructed. The external resistor
and capacitor can adjust the oscillator frequency. The
relative error between the frequencies of the two on-
chip oscillators in the PT8A977B and PT8A9781 must
be less than
±
25%.
Package
14-pin DIP
14-pin SOIC
Die Form
16-pin SOIC
Die Form
Ordering Information
Part No.
PT8A977BP
PT8A977BW
PT8A977BDE
PT8A9781W
PT8A9781DE
PT0118(02/04)
1
Ver:3
Data Sheet
PT8A977B/9781 5-Function Remote
Controller for 1V Micro Cars
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Block Diagram
Block Diagram of 977B
OFF
OSCI
OSCO
Oscillator
Timing
Generator
PC
Forward
Backward
Left
Right
Turbo
Input
Circuit
Encoding
Circuit
Output
Circuit
SO
SC
Block Diagram of 9781
OSCI
OSCO
Oscillator
Timing
Generator
Signal Sample &
Fault-Tolerant
Check
Latch
Output
Circuit
Voltage
Booster
SI
Amp
Decoding
Circuit
Right
Left
Backward
Forward
FOUT
VI1
Amp
VO1
VI2
Amp
VO2
VR
Voltage
Reference
Pin Configuration
PT8A977BP/977BW
14-Pin DIP/14-Pin SOIC
Right
Test
GND
Backward
Forward
Turbo
SC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
Left
OFF
OSCI
OSCO
PC
V
CC
SO
VO2
SI
GND
OSCI
OSCO
Left
FOUT
Forward
PT8A9781W
16-Pin SOIC
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VI2
VR
VO1
VI1
V
CC
NC
Right
Backward
Top View
PT0118(02/04)
2
Ver:3
Data Sheet
PT8A977B/9781 5-Function Remote
Controller for 1V Micro Cars
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Pad Location
PT8A977BDE
Test
Right
GND
Left
OFF
OSCI
Die_No
Backward
Forward
OSCO
Turbo
SC
SO
V
CC
PC
X
Y
1160
µ
m
Pad Coordinates
Pad Name
Right
Test
GND
Backward
Forward
Turbo
X Coordinate
1048.5
1033
903
773
643
513
Y Coordinate
388
100
100
100
100
100
Pad Name
SO
V
CC
PC
OSCO
OSCI
OFF
Left
X Coordinate
96
96
270
510.5
1048.5
1048.5
1048.5
Y Coordinate
469.5
714
918.5
937.5
790.5
658
523
SC
269.5
115
Note: Substrate is connected to V
CC
PT0118(02/04)
1245
µ
m
3
Ver:3
Data Sheet
PT8A977B/9781 5-Function Remote
Controller for 1V Micro Cars
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Pad Location
PT8A9781DE
SI
AGND
VO2
VI2
VR
VO1
DGND
VI1
1240um
OSCI
AVDD
DVDD
OSCO
RIGHT
Forward Backward
Die No.
LEFT
FOUT
1140um
Pad Coordinate File
Pad Name
X Coordinate
Y Coordinate
451.4
451.4
313
192.6
40.8
-227.7
-373.7
-451.3
-451.3
Pad Name
Backward
Right
DVDD
AVDD
VI1
VO1
VR
VI2
X Coordinate
127.3
398.9
398.9
398.9
398.9
398.9
280.9
160.7
Y Coordinate
-451.3
-354.4
-234
-88
26.6
178.4
451.4
451.4
VO2
8.9
SI
-105.7
AGND
-398.9
DGND
-398.9
OSCI
-398.9
OSCO
-398.9
Left
-398.9
FOUT
-188
Forward
2.7
Note: Substrate is connected to GND
PT0118(02/04)
4
Ver:3
Data Sheet
PT8A977B/9781 5-Function Remote
Controller for 1V Micro Cars
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Pin/Pad Description
Pin/Pad Description of 977B
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Pin/Pad Name
Right
Test
GND
Backward
Forward
Turbo
SC
SO
V
cc
PC
OSCO
OSCI
OFF
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.
Pin/Pad Description of 9781
Pin No.
1
2
3
4
5
6
7
8
9
10
12
13
14
15
16
Pin/Pad Name
VO2
SI
AGND
GND
OSCI
OSCO
Left
FOUT
Backward
Forward
Right
V
CC
VI1
VO1
VR
VI2
DVDD
AVDD
DGND
Description
Output pin for the amplifier 2
Input pin of the encoding signal
Analog ground, bonded to DGND as GND
Digital ground, bonded to AGND as GND
Oscillator input pin
Oscillator output pin
Leftward output pin
Output pulse with 50% duty cycle, fequency is about 64kHz.
Backward output pin
Forward output pin
Rightward output pin
Digital power supply, bonded to AVDD as V
CC
Analog power supply, bonded to DVDD as V
CC
Input pin for the amplifier 1
Output pin for the amplifier 1
Amplifier bias voltage
Input pin for the amplifier 2
Note:
additional V
CC
may be needed for on-chip analog circuit.
PT0118(02/04)
5
Ver:3
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