Ionization Smoke Detector
with Interconnect and Timer
A5367
4
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
ELECTRICAL CHARACTERISTICS1,2
at TA = 25°C, VDD = 9.0 V, VSS = 0 V, COSCCAP = 0.1 μF,
RTIMINGRES = 8.2 MΩ (unless otherwise noted)
Continued on the next page…
Characteristic
Symbol
Test Conditions
Test Pin
Min.
Typ.
Max.
Units
Supply Voltage Range
VDD
Operating
6
6.0
9.0
12
V
Supply Current
IDD
VDD = 9.0 V, no alarm, no loads
6
—
5.0
9.0
μA
VDD = 12 V, no alarm, no loads
6
—
12
μA
Detector Input Current
IDETECTIN 0% to 40% RH, VIN = 0 to 9.0 V
15
—
±1.0
pA
Input Offset Voltage
VOS(GUARD1) Active GUARD1
14, 15
—
±100
mV
VOS(GUARD2) Active GUARD2
16, 15
—
±100
mV
VOS
Detect comparator
15, 13
—
±50
mV
Hysteresis
VHYS
No alarm to alarm
13
90
130
170
mV
Common Mode Range
VCM(guard) Guard amplier
14, 15
2.0
—
VDD – 0.5
V
VCM
Smoke comparator
13, 15
0.5
—
VDD – 2.0
V
Active Guard Impedance
ZAG1
GUARD1 to VSS
14
—
10
—
kΩ
ZAG2
GUARD2 to VSS
16
—
500
—
kΩ
Oscillator Period
tosc
No alarm
12
1.34
1.67
2.00
s
tosc(alarm) Local or remote alarm
12
37.50
41.67
45.84
ms
Oscillator Pulse Width
tw(osc)
12
8.0
10
12
ms
Timer Mode Duration
ttimer
After TIMER START high-to-low,
no smoke
4
8.0
10
12
min
Low-Battery Threshold
VDD(th)
TA = 0°C to 50°C,
LOW-V SET open circuit
6
7.2
—
7.8
V
Sensitivity Adjust Voltage
VSET
VSENSITIVITYSET / VDD,
SENSITIVITY SET open circuit
13
48.5
50
51.5
%VDD
Horn Output Voltage
VOL
IOUT = 16 mA, VDD = 9.0 V
10, 11
—
0.1
0.5
V
IOUT = 16 mA, VDD = 7.2 V
10, 11
—
0.9
V
VOH
IOUT = –16 mA, VDD = 9.0 V
10, 11
8.5
8.8
—
V
IOUT = –16 mA, VDD = 7.2 V
10, 11
6.3
—
V
Horn Output On-Time
ton(horn)
Local or remote alarm
10,11
450
500
550
ms
tw(horn)
Low battery
10, 11
8.0
10
12
ms
Horn Output Off-Time
toff1(horn)
Local or remote alarm
(see Timing Diagrams section)
10, 11
450
500
550
ms
toff2(horn)
Local or remote alarm
(see Timing Diagrams section)
10, 11
1350
1500
1650
ms
thorn
Low battery
10, 11
32
40
48
s
TIMER START Logic Levels
VIH
1
4.5
—
V
VIL
1
—
2.5
V
TIMER START Input Current
IIN
VTIMERSTART = 9.0 V
1
20
—
80
μA
TIMER OUT Pulldown Current
IPD
VTIMEROUT = 0.5 V
4
500
—
μA
LED Output-On Current
ILED
VDD = 7.2 V, VLED = 1.0 V
5
10
—
mA
LED Output On-Time
tw(LED)
5
8.0
10
12
ms
LED Output Off-Time
tLED1
No alarm, in standby
5
32
40
48
s
tLED2
No alarm, timer mode
5
8.0
10
12
s
tLED3
Local alarm or test alarm
5
0.76
0.97
1.14
s
tLED4
Remote alarm, no local smoke
5
—
No LED
pulses
—s