a5366 Allegro MicroSystems, Inc., a5366 Datasheet - Page 10

• Manufacturer Part Number: a5366
• Description: Photoelectric Smoke Detector With Interconnect And Timer
• Manufacturer: Allegro MicroSystems, Inc.

A5366
Standby Mode
Low Battery Condition
Degraded Chamber Condition
Chirps occur after 2 consecutive failed tests, and are offset from LED flashes and from chirps that indicate failure of low-battery tests
Low-Battery Test
Low-Battery Test
Chamber Test
OSC CAP Pin
Photo Sample
Chamber Test
Internal Clock
STROBE Pin
Horn Enable
Horn Enable
Sensitivity
IRED Pin
Chamber
VDD Pin
LED Pin
LED Pin
LED Pin
t
w(st)
Chirps occur at the end of a failed “test period,” and are nearly coincident with LED flashes
Failed “test period”
t
w(led)
t
osc
t
st1
LED on
, t
ired1
LED on
Timing Diagrams
LED off
(High-Z)
(Not to Scale)
(Low battery)
LED on
(Degraded chamber)
t
Test event
st5
, t
LED off
(High-Z)
ired5
Photoelectric Smoke Detector
with Interconnect and Timer
t
w(horn)
t
w(horn)
t
horn
t
LED off (High-Z)
horn
t
led1
90%
50%
10%
, t
st5
115 Northeast Cutoff
1.508.853.5000; www.allegromicro.com
Allegro MicroSystems, Inc.
Worcester, Massachusetts 01615-0036 U.S.A.
t
r(ired)
t
w(ired)
t
f(ired)
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