HoltekHT7612无源红外线(PIR)控制方案———HoltekHT7612无源红

Holtek 公司的HT7612是无源红外线(PIR)控制器, 采用新的架构及设计方式，待机电流大幅降低至仅约15uA，在应用上可减少电池耗电，延长电池使用时间，符合现代节能减碳概念之需求。工作电压2.7V ~ 5.5V,40秒上电延迟, 1~3783秒可调PIR接通时间,输出可驱动继电器,TRIAC和LED等, 工作温度范围为-40℃~ 85℃，广泛应用在感应照明、防盗警报器、访客报知器、感应门、智慧玩具等..本文介绍HT7612主要特性, 方框图以及在TRIAC, 继电器和4.5V DC电源中应用电路图.

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应用:

PIR light control

Motion detectors

Alarm system

Auto door bells

图1.HT7612方框图

图2.HT7612在TRIAC中应用电路图
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.

图3.HT7612在继电器中应用电路图
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

图4.HT7612在4.5V DC电源中应用电路图
Note: Adjust R9 to fit various CDS.
Adjust R6 to obtain the desired output duration.
Adjust R5 to change PIR sensitivity.