UT8803 datasheet(4/6 Pages) UTC

4 / 6 page

UT8803

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

4 of 6

www.unisonic.com.tw

QW-R502-094,B

FUNCTIONAL DESCRIPTION

1. The PIR amplifier (the first and second stage Op Amp) amplifies PIR signal. Its multiple can be adjust through

resistance and capacitance outside.

2. If the amplificatory PIR signal voltage is higher than VH (Typ 1.8V) or lower than VL (Typ 1.15V), the Window

Comparer

outputs high level.

3. The Pulse Width Detector detects the Window Comparer’s pulse width, if the high pulse width is more than

768*TTb, this pulse is in effect, and the RELAY or the traic is triggered. Otherwise, it is ignored.

4. When an availability PIR signal is detected, the RELAY outputs high level, and the TRAIC outputs pulse, and the

Counter

starts to count, but if a new availability PIR signal appears, the Counter restarts to count. After

245760*TTci, the RELAY and TRIAC stop output.

5. Pin CDS connect a CDS, it can control pin RELAY to keep low level in the daytime.

6. When the AC power crosses zero line, the Zero Cross Detector generates a pulse, and permits the TRIAC to be

triggered, after 32*TTb.

UT8803 Datasheet(PDF) 4 Page - Unisonic Technologies