PT8A971AP Datasheet, PDF (1/10 Pages) List of Unclassifed Manufacturers – 5-Function Remote Controller

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)
General Description
The PT8A971AP and PT8A972AP is a pair of CMOS
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.
Block Diagram
Block Diagram of PT8A971AP
OFF
OSCI
OSCO
Oscillator
Timing
Generator
4 Minutes
Counter
PC
Right
Left
Turbo
Forward
Backward
Input
Circuit
Encoding
Output
SO
Circuit
Circuit
SC
PT0066(28/08/01)
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