8A978P – PT8A978P

Part Number : 8A978P

Function : PT8A978P

Manufactures : Pericom

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Description :

Data Sheet PT8A977P/977W/978P/978LW 5-Function Remote Controller Features • PT8A977P/977W works as encoder and PT8A978P/978LW works as decoder • Five pins for five control functions • Operating power-supply voltage: 2.5V to 5.0V (977P, 977W, 978P), 2.0V to 5.0V (978LW) • Auto-power-off if no press on any button in 8s or continuously press on any button over 4 minues • Press on any button as wake up (977P, 977W) • Manual-power-off with OFF button • One output pin used for external power control (977P, 977W) • On-chip oscillator with an external resistor • On-chip reversing amplifiers (978P, 978LW) • Low operating current • Few external components needed • Package: 14-pin DIP, 14-pin SOIC, 16-pin DIP and 16-pin SOIC General Description The PTA977P (or 977W) and PT8A978P (or 978LW) provide a complete control functions to the remotecontrolled toy. The PT8A977P/977W has five input pins corresponding with the five function buttons i.e, forward, backward, rightward, leftward and turbo. The encoding circuit in the PT8A977P/977W 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 PT8A978P (or 978LW) 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. There is an internal oscillator in the PT8A977P/977W Ordering Information Pa r t No. PT8A977P PT8A977W PT8A978P PT8A978LW Pa ck a ge 14-pin DIP 14-pin SOIC 16-pin DIP 16-pin SOIC 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. PT0074(10/01) 1 Ver:1 Free Datasheet PT8A977P/977W/978P/978LW 5-Function Remote ControllerBlock Dia […]

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8A978P Datasheet


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