Datasheet

RE46C122
CMOS Ionization Smoke Detector ASIC with R&E International
Interconnect and Timer Mode
A Subsidiary of Microchip Technology Inc.
Product Specification
Timing Diagram (non Timer Mode)
Standby Mode; No Low Battery; No Alarm Alarm; No Low Battery Alarm; Low Battery
Oscillator
1.67S 10.5mS
Internal Clock
24 Clock Cycles (40 S)
LED
Sample Smoke
Low Battery Warning Chirp
Horn
See Figure Below for Complete Horn Cycle
T
IODLY1
IO (Pin 2) as Output
Timing not same scale as above
IO Charge Dump
T
IOFILT
IO ( Pin 2) as Input
LED supressed in remote alarm mode
T
IODLY2
Horn
Start of horn temporal pattern is not synchronized to an external alarm Horn pattern not self completing for external alarm,see timing below for complete horn cycle
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
T
HON1
T
HOF1
Complete Temporal Horn Pattern
Pin 15 > Pin 13 Pin 15 > Pin 13Pin 13 > Pin 15; 130mV Level Shift on Pin 13
No Alarm; Low Battery
T
HOF2
24 Clock Cycles (1S)
© 2009 Microchip Technology Inc. DS22173B-page 8