a5355ca Allegro MicroSystems, Inc., a5355ca Datasheet - Page 5

• Manufacturer Part Number: a5355ca
• Description: Smoke Detector With Interconnect
• Manufacturer: Allegro MicroSystems, Inc.

COMPARATOR
INTERNAL
CHAMBER
OSC. CAP
5355
SMOKE DETECTOR
WITH INTERCONNECT
CLOCK
SMOKE
SMOKE
HORN
V12
LED
1.67 s
V15 < V13 (NO SMOKE)
SAMPLE
24 CLOCK CYCLES
LED OFF
NO LOW BATTERY
STANDBY MODE
NO ALARM
10 ms
NOTE 1: An external resistor divider is used to adjust sensitivity for the particular
NOTE 2: A resistor to ground or V
TIMING DIAGRAMS IN TYPICAL APPLICATION
OTHER
UNITS
TO
9 V
LED
ON
smoke chamber.
battery voltage threshold.
NOTE
1 F
200
2
8.2 M
330
40 ms
HORN
ON
12 CLOCK CYCLES
TYPICAL APPLICATION
1
2
3
4
5
6
7
8
NC
NC
V
OFF
DD
NO LOW BATTERY
DRIVER
LOGIC
TIMING
OSC. &
HORN
ALARM
24 CLOCK CYCLES
DD
V15 > V13 (SMOKE)
may be added to this pin to modify low
V
SS
6 CLOCK CYCLES
16
15
14
13
12
11
10
9
0.1 F
6 CLOCK CYCLES
LOW BATTERY
ALARM AND
0.001 F
NOTE 1
PUSH
Dwg. EC-005-5
TEST
TO
30 CLOCK CYCLES
LOW BATTERY
NO ALARM
LOW BATTERY
WARNING
Dwg. WC-003-1