Holtek 公司的HT7612是無源紅外線(PIR)控制器, 采用新的架構及設計方式，待機電流大幅降低至僅約15uA，在應用上可減少電池耗電，延長電池使用時間，符合現代節能減碳概念之需求。工作電壓2.7V ~ 5.5V,40秒上電延遲, 1~3783秒可調PIR接通時間,輸出可驅動繼電器,TRIAC和LED等, 工作溫度范圍為-40℃~ 85℃，廣泛應用在感應照明、防盜警報器、訪客報知器、感應門、智慧玩具等..本文介紹HT7612主要特性, 方框圖以及在TRIAC, 繼電器和4.5V DC電源中應用電路圖.

HT7612: General Purpose PIR Controller

The HT7612 is PIR controller specifically designed to interface to PIR sensors to implement motion sensing application products such as intruder alarms. The controller has the features of PIR sensitivity adjustment and a CDS can be connected to the controller for automatic detection. The HT7612 is available in low profile NSOP & DIP packages.

HT7612主要特性:

Operating voltage: 2.7V ~ 5.5V

Standby current typical 15uA

CDS input

High noise immunity

40 second power-on delay

10 second high speed warm-up for test mode

1~3783 second adjustable PIR turn on time.

Output drive for Relay, TRIAC and LED

Output drive buzzer alarm

Low voltage detector

Override function

16-pin DIP/NSOP package

HT7612應用:

PIR light control

Motion detectors

Alarm system

Auto door bells

圖1.HT7612方框圖

圖2.HT7612在TRIAC中應用電路圖
Note: Adjust R9 to fit various CDS.
Adjust R6 to obtain the desired output duration.
Adjust R5 to change PIR sensitivity.
Change the value of C10 to 0.33_F/600V for AC 220V application.

圖3.HT7612在繼電器中應用電路圖
Note: Adjust R9 to fit various CDS.
Adjust R6 to obtain the desired output duration.
Adjust R5 to change PIR sensitivity.
Change the value of C10 to 0.33_F/600V for AC 220V application

圖4.HT7612在4.5V DC電源中應用電路圖
Note: Adjust R9 to fit various CDS.
Adjust R6 to obtain the desired output duration.
Adjust R5 to change PIR sensitivity.