A5348 Datasheet, PDF (3/9 Pages) Allegro MicroSystems – The A5348 is a low-current, BiCMOS circuit providing all of the required features for an ionization-type smoke detector.

A5348
Ionization Smoke Detector
with Interconnect and Timer
Functional Block Diagram
+Supply
9V
VDD
LBSamp
Band
Gap
LOW-V SET
Low Battery
Sample
600 kΩ
Low Battery
Comparator
_
+
500 kΩ
SENSITIVITY SET
SSamp
Smoke
Sample
1.1 MΩ
+
_
Smoke
Comparator
-Supply
VSS
+
_
I/O
V_DD
Logic
Power-on
Reset
LBSamp
SSamp
Oscillator
and Timing
GUARD1
DETECT IN GUARD2
+ V_DD
ION CHAMBER
TIMER START
FEEDBACK
HORN2
HORN1
LED
+ V_DD
TIMING RES
OSC CAP
TIMER OUT
+ V_DD
Allegro MicroSystems, Inc.
3
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com