a5349 Allegro MicroSystems, Inc., a5349 Datasheet - Page 3

• Manufacturer Part Number: a5349
• Description: Ac Ionization Smoke Detector With Interconnect And Timer
• Manufacturer: Allegro MicroSystems, Inc.

A5349
SENSITIVITY SET
9V
+Supply
LOW-V SET
-Supply
VSS
VDD
Low Supply
SSamp
Sample
Sample
Smoke
LSSamp
1.1 MΩ
600 kΩ
500 kΩ
Band
GUARD1
Gap
+
_
+
_
+
_
Comparator
Low Supply
Smoke
Comparator
Functional Block Diagram
DETECT IN
ION CHAMBER
+ V
LSSamp
SSamp
DD
Logic
I/O
GUARD2
and Timing
Oscillator
AC Ionization Smoke Detector
V
DD
with Interconnect and Timer
Power-on
Reset
TIMER START
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
FEEDBACK
HORN2
HORN1
LED
TIMING RES
OSC CAP
TIMER OUT
+ V
+ V
DD
DD
3