Data Sheet
PT8A977B/978B/978BL
5-Function Remote Controller
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Features
• PT8A977B works as encoder and PT8A978B/
978BL works as decoder
• Five pins for five control functions
• Operating power-supply voltage: 2.5V to 5.0V (978B),
2.0V to 5.0V (978BL), 1.8V to 5.0V(977B)
• Auto-power-off and oscillation-off if no press on
any button (977B)
• Press on any button to wake up (977B)
• One output pin used for external power control
(977B)
• On-chip oscillator with an external resistor
• On-chip reversing amplifiers (978B, 978BL)
• Low operating current
• Few external components needed
• Package: 14-pin DIP, 14-pin SOIC,
and 16-pin SOIC
16-pin DIP
Description
The PT8A977B and PT8A978B (or 978BL) provide
complete control functions to the remote-controlled toy.
The PT8A977B has five input pins corresponding with
the five function buttons i.e, forward, backward, rightward,
leftward and turbo. The encoding circuit in the PT8A977B
sends digital codes to the two output pins SO and SC.
The digital codes correspond to the definite function
buttons or their combinations. The SO and SC outputs
are used in wireless and infra-red applications
respectively.
The PT8A978B (or 978BL) has five output pins
corresponding with the five actions. 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.
Ordering Information
P a r t N o.
PT8A977BPE
PT8A977BWE
PT8A977BDE
PT8A978BPE
PT8A978BLWE
PT8A978BDE
Pa ck a ge
Lead free 14- pin DIP
Lead free 14- pin SO IC
Die Form
Lead free 16- pin DIP
Lead free 16- pin SO IC
Die Form
There is an internal oscillator in the PT8A977B and 978B/
978BL 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 PT8A977B and
PT8A978B/978BL must be less than
±25%.
The auto-power-off function is achieved by an internal
counter (977B). The PC output is used to control on/off
state of the external power supply. Press on any function
button will wake up the chip promptly.
PT0085(08/07)
1
Ver:6
Data Sheet
PT8A977B/978B/978BL
5-Function Remote Controller
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Pin/Pad Description
Pin/Pad Description of 977B
Pin No.
Pin/Pad Name
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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 978B/978BL
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin/Pad Name
VO2
GND
SI
OSCI
OSCO
Right
Left
RD
LD
Backward
Forward
Turbo
V
cc
VI1
VO1
VI2
Description
Output pin for the amplifier 2
Negative power supply
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
PT0085(08/07)
5
Ver:6
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