RE46C121 Datasheet, PDF (6/7 Pages) Microchip Technology – CMOS Ionization Smoke Detector ASIC with Interconnect

RE46C120
CMOS Ionization Smoke Detector ASIC
Product Specification
R&E International
A Subsidiary of Microchip Technology Inc.
Standby Mode; No Low Battery; No Alarm
Timing Diagram
Alarm; No Low Battery
Alarm; Low Battery
No Alarm; Low Battery
Oscillator
Internal Clock
LED
DETCOMP (pin1)
Sample (2/3 Duty)
Sample (NFPA72)
Pin 15 > Pin 13
1.67S 10mS
24 Clock Cycles (40 S)
Horn (2/3 Duty Cycle, TONE=VSS)
Horn (NFPA72, TONE=Open)
Pin 13 > Pin 15; 130mV Level Shift on Pin 13
24 Clock Cycles (1S)
T_HON3
T_HOF3
See Figure Below for Complete Temporal Horn Cycle
Pin 15 > Pin 13
Low Battery Warning Chirp
Low Battery Warning Chirp
Notes:
1. Smoke is not sampled when the horn is active so the horn cycle is self completing
2. Low battery warning chirp is suppressed in alarm
T_HON1 T_HOF1
T_HOF2
Complete Temporal Horn Pattern
© 2009 Microchip Technology Inc.
DS22157A-page 6