HT8A977BPE データシートの表示（PDF） - TY Semiconductor

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HT8A977BPE

HT8A977B works as encoder and HT8A978B works as decoder

TY Semiconductor 

Product specification

HT8A977

Description

The HT8A977B and HT8A978B provide

complete control functions to the

remote-controlled toy. The HT8A977B has five

input pins corresponding with the five function

buttons i.e, forward, backward, rightward, leftward

and turbo. The encoding circuit in the HT8A977B

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 HT8A978B 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

HT8A977B and 978B 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 HT8A977B and HT8A978B

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.

FEATURES

 HT8A977B works as encoder and

HT8A978B works as decoder

 Five pins for five control functions

 Operating power-supply voltage: 2.5V to

5.0V (978B), 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)

 Low operating current

 Few external components needed

 Package: 14-pin DIP, 14-pin SOIC, 16-pin

DIP, 16-pin SOIC, die form and wafer form

Ordering Information

Part No.

Package

HT8A977BPE

Lead free 14-pin DIP

HT8A977BWE

Lead free 14-pin SOIC

HT8A978BPE

Lead free16-Pin DIP

HT8A978BLWE

Lead free 16-pin SOIC

http://www.twtysemi.com

sales@twtysemi.com

4008-318-123

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