RE46C143

CMOS Photoelectric Smoke Detector ASIC with Interconnect

R&E International

Product Specification

A Subsidiary of Microchip Technology Inc.

© 2009 Microchip Technology Inc.

DS22178A-page 11

Timing Diagrams (continued)

Local Alarm Timing (not to scale)

STROBE

IRED

LED

Horn Timing

No Alarm

Local or Remote Alarm

No Alarm

Horn

Interconnect Timing

IO as Output

IO as Input

Notes:

1. Smoke is not sampled when the horn is active. Horn cycle is self completing in local alarm.

2. Low battery warning chirp is suppressed in local or remote alarm

3. IO Dump active only in local alarm, inactive if external alarm