Photoelectric Smoke Detector
with Interconnect and Timer
A5366
6
Allegro MicroSystems, Inc.
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
IRED Pulse Period
tired1
No local or remote smoke
6
9
9.6
–
11.9
s
tired2
After 1 of 3 valid samples
6
9
1.8
2.0
2.2
s
tired3
After 2 of 3 valid samples and during local
alarm
6
9
0.8
1.0
1.1
s
tired4
Remote smoke only
6
9
7.2
8.0
8.9
s
tired5
Chamber test, no local alarm
6
9
38.9
–
47.1
s
tired6
Pushbutton test, induced alarm
6
9
225
252
278
ms
IRED Pulse Width
tw(ired)
6
9
94
–
116
μs
IRED Rise Time
tr(ired)
10% to 90%
6
–
–
30
μs
IRED Fall Time
tf(ired)
90% to 10%
6
–
–
200
μs
I/O to Active Delay
td(io)
Local alarm
7
9
–
0
–
s
I/O Charge Dump Duration
tdump
End of local alarm or test
7
9
0.9
1.0
1.1
s
Rising Edge on I/O to Alarm
tr(io)
No local alarm
7
9
–
–
128 ×
tOSC
s
Horn Warning Pulse Period
thorn
Low battery or degraded chamber sensitivity
8, 9
9
38.9
–
47.1
s
Horn Warning Pulse Width
tw(horn)
Low battery or degraded chamber sensitivity
8, 9
9
9.5
–
11.5
ms
Horn On-Time
ton(horn)
Local or remote alarm
8, 9
9
450
500
550
ms
Horn Off-Time
toff1(horn)
Local or remote alarm (see Timing Diagrams
section)
8, 9
9
450
500
550
ms
toff2(horn)
Local or remote alarm (see Timing Diagrams
section)
8, 9
9
1350
1500
1650
ms
1
Limits over the operating temperature range are based on characterization data. Characteristics are production tested at 25°C only.
2
Typical values are at 25°C and are given for circuit design information only.
AC ELECTRICAL CHARACTERISTICS (continued) at TA = –25°C to 75°C1, VSS = 0 V, in typical application (unless otherwise noted)
Characteristic
Symbol
Test Conditions
Test Pin
VDD
Min.
Typ.2
Max.
Units
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