A5348 Datasheet PDF - Allegro

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A5348
Allegro

Part Number A5348
Description Ionization Smoke Detector
Page 9 Pages


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A5348
Ionization Smoke Detector
with Interconnect and Timer
Features and Benefits
Low average standby current for long battery life
Interconnect up to 125 detectors
Piezoelectric horn driver
Guard outputs for detector input
Pulse testing for low battery
Power-on reset (POR)
Internal reverse battery protection
Timer (Hush) mode for enabling reduced sensitivity period
Built-in hysteresis reduces false triggering
Package: 16-pin DIP (suffix A):
Description
The A5348 is a low-current, BiCMOS circuit providing
all of the required features for an ionization-type smoke
detector. A networking capability allows as many as 125
units to be interconnected so that if any unit senses smoke all
units will sound their alarm. In addition, special features are
incorporated to facilitate alignment and test of the finished
smoke detector.
The internal oscillator and timing circuitry keep standby power
to a minimum by powering down the device for 1.66 seconds
and sensing for smoke for only 10 ms. Every 24 on-off cycles,
a check is made for a low battery condition. By substituting
other types of sensors or a switch for the ionization detector,
this very-low–power device can be used in numerous other
battery-operated safety/security applications.
The A5348 is supplied in a low-cost 16-pin dual in-line plastic
package (DIP). It is rated for continuous operation over the
temperature range of –10°C to 60°C. The Pb (lead) free version
(suffix –T) has 100% matte tin leadframe plating.
Not to scale
Typical Application
50 kΩ
To / from
other units
9V
Timer
Mode
1
200 Ω 2
C3
4
330 Ω 5
200 kΩ
TIMER START
GUARD2
I/O DETECT IN
A5348
LOW-V SET
GUARD1
TIMER OUT
SENSITIVITY SET
LED OSC CAP
16
15
14
13
12
8.2 MΩ
6 VDD
7 TIMING RES
11
HORN2
10
HORN1
1 μF 8 FEEDBACK
9
VSS
B
200 k Ω
Push
to Test
A
0.1 μF
A Use an external resistor to adjust
sensitivity for a particular smoke chamber.
B Select resistor to reduce sensitivity
during Timer mode.
C A resistor to VSS or VDD may
be added to this pin to modify
low battery voltage threshold.
D Value of component will vary, based on
the piezoelectric horn used.
1.5 MΩ
D
220 kΩ
D
0.001 μF
D
26110.3 Rev. 4



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A5348
Ionization Smoke Detector
with Interconnect and Timer
Selection Guide
Part Number
A5348CA-T
A5348CA
Pb-Free
Yes
Packing
25 pieces per tube
Absolute Maximum Ratings*
Characteristic
Symbol
Notes
Rating
Units
Supply Voltage Range
VDD Referenced to VSS
–0.5 to 15
V
Input Voltage Range
VIN Referenced to VSS
–0.3 to VDD+ 0.3 V
Reverse Battery Condition Duration
tRBAT
10.5 V
20 s
Input Current
IIN
10 mA
Operating Ambient Temperature
TA
–10 to 60
ºC
Junction Temperature
TJ(max)
150 ºC
Storage Temperature Range
Tstg
–55 to 125
ºC
* CAUTION:BiCMOS devices have input static protection but are susceptible to damage when exposed to extremely high static electrical charges.
THERMAL CHARACTERISTICS
Characteristic
Symbol
Test Conditions*
Package Thermal Resistance
RθJA 4-layer PCB based on JEDEC standard
*Additional thermal information available on Allegro website.
Value Units
38 ºC/W
Pin-out Diagram
TIMER START 1
I/O 2
LOW-V SET 3
TIMER OUT 4
LED 5
VDD 6
TIMING RES 7
FEEDBACK 8
16 GUARD2
15 DETECT IN
14 GUARD1
13 SENSITIVITY SET
12 OSC CAP
11 HORN2
10 HORN1
9 VSS
Terminal List Table
Number
Name
Function
1 TIMER START Input to start reduced sensitivity timer mode
2 I/O Input/output to interconnected detectors
3
LOW-V SET
Optionally used with a resistor to adjust low-battery
threshold
4
TIMER OUT
Optionally used with a resistor to adjust sensitivity
during timer mode
5 LED Output to drive visible LED
6
VDD
Positive supply voltage
7
TIMING RES
Terminal for timing resistor, sets internal bias
(affects timing)
8 FEEDBACK Input for driving piezoelectric horn
9
VSS
Negative supply voltage
10
HORN1
Output for driving piezoelectric horn
11
HORN2
Complementary output for driving piezoelectric horn
12
OSC CAP
Terminal for charging/discharging an external
capacitor to run the oscillator
13
SENSITIVITY SET
Optionally used with a resistor to adjust sensitivity
for a specific chamber
14
GUARD1
Active guard 1 for detector input
15 DETECT IN Input from detector chamber
16
GUARD2
Active guard 2 for detector input
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
2



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A5348
Ionization Smoke Detector
with Interconnect and Timer
Functional Block Diagram
+Supply
9V VDD
LBSamp
Band
Gap
LOW-V SET
SENSITIVITY SET
Low Battery
Sample
600 kΩ
Low Battery
Comparator
_
+
500 kΩ
SSamp
Smoke
Sample
1.1 MΩ
+
_
Smoke
Comparator
-Supply
VSS
+
_
I/O
VDD
Logic
Power-on
Reset
LBSamp
SSamp
Oscillator
and Timing
GUARD1
DETECT IN GUARD2
+ VDD
ION CHAMBER
TIMER START
FEEDBACK
HORN2
HORN1
LED
+ VDD
TIMING RES
OSC CAP
TIMER OUT
+ VDD
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
3



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A5348
Ionization Smoke Detector
with Interconnect and Timer
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)
Characteristic
Supply Voltage Range
Supply Current
Detector Input Current
Input Offset Voltage
Hysteresis
Common Mode Range
Active Guard Impedance
Oscillator Period
Oscillator Pulse Width
Timer Mode Duration
Symbol
Test Conditions
VDD Operating
IDD
VDD = 9.0 V, no alarm, no loads
VDD = 12 V, no alarm, no loads
IDETECTIN 0% to 40% RH, VIN = 0 to 9.0 V
VOS(GUARD1) Active GUARD1
VOS(GUARD2) Active GUARD2
VOS Detect comparator
VHYS No alarm to alarm
VCM(guard) Guard amplier
VCM Smoke comparator
ZAG1 GUARD1 to VSS
ZAG2 GUARD2 to VSS
tosc No alarm
tosc(alarm) Local or remote alarm
tw(osc)
ttimer
After TIMER START high-to-low,
no smoke
Test Pin
6
6
6
15
14, 15
16, 15
15, 13
13
14, 15
13, 15
14
16
12
12
12
4
Min.
6.0
90
2.0
0.5
1.34
37.50
8.0
8.0
Typ.
9.0
5.0
130
10
500
1.67
41.67
10
10
Low-Battery Threshold
VDD(th)
TA = 0°C to 50°C,
LOW-V SET open circuit
6 7.2 —
Sensitivity Adjust Voltage
VSET
VSENSITIVITYSET / VDD,
SENSITIVITY SET open circuit
13
48.5
50
Horn Output Voltage
Horn Output On-Time
Horn Output Off-Time
TIMER START Logic Levels
TIMER START Input Current
TIMER OUT Pulldown Current
LED Output-On Current
LED Output On-Time
LED Output Off-Time
VOL
VOH
ton(horn)
tw(horn)
toff(horn)
thorn
VIH
VIL
IIN
IPD
ILED
tw(LED)
tLED1
tLED2
tLED3
tLED4
IOUT = 16 mA, VDD = 9.0 V
IOUT = 16 mA, VDD = 7.2 V
IOUT = –16 mA, VDD = 9.0 V
IOUT = –16 mA, VDD = 7.2 V
Local or remote alarm
Low battery
Local or remote alarm
Low battery
VTIMERSTART = 9.0 V
VTIMEROUT = 0.5 V
VDD = 7.2 V, VLED = 1.0 V
No alarm, in standby
No alarm, timer mode
Local alarm or test alarm
Remote alarm, no local smoke
10, 11
10, 11
10, 11
10, 11
10,11
10, 11
10, 11
10, 11
1
1
1
4
5
5
5
5
5
5
— 0.1
——
8.5 8.8
6.3 —
120 160
8 10
60 80
32 40
3.5 —
——
20 —
500 —
10 —
8.0 10
32 40
8.0 10
0.76 0.97
No LED
pulses
Max.
12
9.0
12
±1.0
±100
±100
±50
170
VDD – 0.5
VDD – 2.0
2.00
45.84
12
12
7.8
51.5
0.5
0.9
208
12
104
48
1.5
80
12
48
12
1.14
Units
V
μA
μA
pA
mV
mV
mV
mV
V
V
kΩ
kΩ
s
ms
ms
min
V
%VDD
V
V
V
V
ms
ms
ms
s
V
V
μA
μA
mA
ms
s
s
s
s
Continued on the next page…
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
4



A5348 datasheet pdf
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A5348 pdf
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