General Purpose PIR Controller
The HT761X is a CMOS LSI chip designed for use in automatic PIR
lamp control. It can operate with a 2-wire configuration for triac
applications or with a 3-wire configuration for relay applications.
The chip is equipped with operational amplifiers, a comparator, timer,
a zero crossing detector, control circuit, a voltage regulator, a
system oscillator, and an output timing oscillator.
Its PIR sensor detects infrared power variations induced by the motion
of a human body and transforms it to a voltage variation. If the PIR
output voltage variation conforms to the criteria (refer to the functional
description), the lamp is turned on with an adjustable duration.
The HT761X offers three operating modes (ON, AUTO, OFF) which can
be set through the MODE pin. While the chip is working in the AUTO
mode the user can override it and switch to the TEST mode, or manual
ON mode, or return to the AUTO mode by switching the power switch.
The chip is enclosed in a 16 pin DIP/SOP.
- Operating voltage: 5V~12V
- Standby current: 100uA (Typ.)
- On-chip regulator
- Adjustable output duration
- CDS input
- 40 second warm-up
- ON/AUTO/OFF selectable by MODE pin
- Override function
- Auto-reset if the ZC signal disappears over 3 seconds
- 16-pin DIP package