RE46C129

CMOS Ionization Smoke Detector ASIC with Interconnect

R&E International

Product Specification

A Subsidiary of Microchip Technology Inc.

© 2009 Microchip Technology Inc.

DS22172A-page 7

Timing Diagram

Internal Clock

24 Clock Cycles (40 S)

Ouput High Z

LED

Sample Smoke

Low Battery Warning Chirp

Horn

IO (Pin 2) as Output

Timing not same scale as above

IO Charge Dump

IO ( Pin 2) as Input

LED supressed in remote alarm mode

Horn

Start of horn pattern is not synchronized to an external alarm

Horn pattern not self completing for external alarm

Internal Clock

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.

24 Clock Cycles (1S)

Pin 15 < Pin 13

Pin 15 < Pin 13

Pin 15 > Pin 13