HT6P12-20 データシートの表示（PDF） - Holtek Semiconductor

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HT6P12-20

Learning Car Alarm Decoder

Holtek Semiconductor 

HT6P12

Pin Name

I/O

Internal

Connection

Description

OPT1(SK)

Input: Selection of the siren and chirp sound function:

I/O

CMOS I/O

Pull-High

Hi or Open: Chirp and siren sounds enabled

Low: Chirp and siren sounds disabled

Output: Serial clock output for EEPROM

(connected to the SK pin of EEPROM)

TRIG

I CMOS IN Alarm trigger input pin in the arm state, high active

AL–

I CMOS IN Alarm trigger input pin in the arm state, low active

AL+

I CMOS IN Alarm trigger input pin in the arm state, high active

FLASH

O CMOS OUT Flash output pin to control an external car lamp circuit

RES

I CMOS IN Input pin for resetting the chip inside, low active

VDD

—

—

Positive power supply

OSC

I

—

Oscillator input pin

DIN

I CMOS IN Serial data input pin

LEARN(LED) I/O

CMOS I/O

Pull-High

Input: To set the chip into the learning state or to erase all

EEPROM data when used with the CLEAR(CS) pin,

low active

Output: To sink the LED current for indicating the function

state

OPT2(DO)

Input: Selection of the car lamp flash function during alarm

Hi or Open: Lamp flash enabled

I/O

CMOS I/O

Pull-High

Low: Lamp flash disabled

Output: To activate the LED for indicating the function state

(refer to the function description)

This pin is also used to output the received data to

the EEPROM (connected to the DI pin of EEPROM)

ACC(DI)

An active high signal to the ACC pin can disarm the alarm

I CMOS IN system. This pin is also used to input data from the

EEPROM (connected to the DO pin of EEPROM)

Approximate internal connection circuits

5

2nd Oct ’97

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