A5354CA [ALLEGRO]
SMOKE DETECTOR WITH INTERCONNECT; 内连接烟雾探测器
| 型号： | A5354CA |
| 厂家： | 
ALLEGRO MICROSYSTEMS |
| 描述： | SMOKE DETECTOR WITH INTERCONNECT |
| 文件： | 总8页 (文件大小：79K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
5354
SMOKE DETECTOR
WITH INTERCONNECT
The A5354CA is a low-current, CMOS 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 an alarm. In addition,
special features are incorporated to facilitate alignment and test of the
finished smoke detector. This device is designed to comply with
Underwriters Laboratories Specification UL217.
NO CONNECT.
I / O
1
2
3
4
NC
16
15
14
13
12
11
10
9
GUARD
2
DETECT. IN
LOGIC
LOW-V SET
NO CONNECT.
LED
GUARD
1
SENSITIVITY
SET
NC
V
OSC. &
TIMING
The internal oscillator and timing circuitry keeps standby power to
a minimum by powering down the device for 1.66 seconds and sensing
smoke for only 10 ms. Every 24 on/off cycles, a check is made for 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.
5
6
OSC. CAP.
+ SUPPLY
HORN
2
DD
HORN
DRIVER
7
8
TIMING RES.
FEEDBACK
HORN
1
V
– SUPPLY
SS
The A5354CA is supplied in a low-cost, 16-pin dual in-line plastic
package. It is rated for continuous operation over the temperature
range of 0°C to +50°C. Similar devices, with an internal timer to allow
for a period of reduced sensitivity (“hush”), are available as the
A5348CA.
Dwg PC-004-1
FEATURES
ABSOLUTE MAXIMUM RATINGS
(Voltages are referenced to VSS)
■ Interconnect Up to 125 Detectors
■ Piezoelectric Horn Driver
■ Guard Outputs for Detector Input
■ Pulse Testing for Low Battery
■ Power-ON Reset
Supply Voltage Range,
VDD ................................ -0.5 V to +15 V
Reverse Battery (10.5 V) ....................... 20 s
Input Voltage Range,
■ Internal Reverse Battery Protection
■ Built-In Hysteresis Reduces False Triggering
VIN ........................ -0.3 V to VDD + 0.3 V
Input Current, IIN ............................... 10 mA
Operating Temperature Range,
TA ..................................... 0°C to +50°C
Storage Temperature Range,
TS ............................... -55°C to +125°C
CAUTION: CMOS devices have input static
protection but are susceptible to damage when
exposed to extremely high static electrical
charges.
Always order by complete part number: A5354CA .
5354
SMOKE DETECTOR
with INTERCONNECT
FUNCTIONAL BLOCK DIAGRAM AND TYPICAL APPLICATION
+ SUPPLY
V
I / O
2
DD
6
FEEDBACK
8
V
9 V
DD
+
11
HORN
2
10
–
+
HORN
1
3
LOW-V
SET
LOGIC
+V
5
LED
13
+
–
POWER-ON
RESET
SENSITIVITY
SET
TIMING RES.
7
+V
OSC. CAP.
12
OSCILLATOR
& TIMING
+
–
– SUPPLY
9
V
15
4
14
16
1
SS
DETECT.
IN
NO
NO
CONNECTION
CONNECTION
GUARD
GUARD
1
2
+V
Dwg. FC-001-4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1996, Allegro MicroSystems, Inc.
5354
SMOKE DETECTOR
with INTERCONNECT
ELECTRICAL CHARACTERISTICS at TA = +25°C, VDD = 9.0 V, VSS = 0 V, C12 = 0.1 µF,
R7 = 8.2 MΩ (unless otherwise noted).
Limits
Test
Characteristic
Pin
Test Conditions
Operating
Min.
6.0
—
Typ.
9.0
—
Max.
12
Units
V
Supply Voltage Range
Detector Input Current
Input Offset Voltage
6
15
0 to 40% RH, VIN = 0 to 9.0 V
Active Guard
Active Guard
Detect Comparator
No Alarm to Alarm
Guard Amplifier
Smoke Comparator
to VSS
±1.0
±100
±100
±50
170
VDD - 0.5
VDD - 2.0
—
pA
mV
mV
mV
mV
V
14-15
16-15
15-13
13
—
—
—
—
—
—
Hysteresis
90
130
—
Common Mode Range
14-15
13-15
14
2.0
0.5
—
—
V
Active Guard Impedance
Oscillator Period
10
kΩ
kΩ
s
16
to VSS
—
500
1.67
40
—
12
No Alarm
1.34
32
2.00
48
Alarm
ms
ms
V
Oscillator Pulse Width
Low Voltage Threshold
Sensitivity Adjust Voltage
Horn Output Voltage
12
6
8.0
7.2
48.5
—
10
12
TA = 0°C to 50°C
—
7.8
13
V13/VDD, pin 13 open circuit
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
Alarm
50
51.5
0.5
%
10-11
0.1
—
V
—
0.9
V
8.5
6.3
120
8.0
60
8.8
—
—
V
—
V
Horn Output ON Time
Horn Output OFF Time
10-11
10-11
160
10
208
12
ms
ms
ms
s
Low Battery
Alarm
80
104
48
Low Battery
32
40
LED Output ON Current
LED Output ON Time
LED Output OFF Time
5
5
5
VDD = 7.2 V, VOUT = 1.0 V
10
—
—
mA
ms
s
8.0
32
10
12
No Alarm, In Standby
40
48
Continued next page . . .
NOTE 1: Negative current is defined as coming out of (sourcing) the specified device pin.
NOTE 2: Alarm (Smoke) Condition is defined as V < V ; No Alarm (No Smoke) Condition as V > V .
13
15
13
15
5354
SMOKE DETECTOR
with INTERCONNECT
ELECTRICAL CHARACTERISTICS continued
Limits
Typ.
Test
Pin
Characteristic
Test Conditions
Min.
Max.
Units
I/O Current
2
No Alarm, VI/O = VDD - 2.0 V
25
—
—
60
µA
Alarm, VI/O = VDD - 2.0 V
External “Alarm” In
-7.5
3.0
—
—
—
mA
V
I/O Alarm Voltage
I/O Delay
2
2
6
—
“Alarm” Out
3.0
5.0
—
—
s
Supply Current
VDD = 9.0 V, No Alarm, No Loads
VDD = 12 V, No Alarm, No Loads
—
9.0
12
µA
µA
—
NOTE 1: Negative current is defined as coming out of (sourcing) the specified device pin.
NOTE 2: Alarm (Smoke) Condition is defined as V < V ; No Alarm (No Smoke) Condition as V > V .
13
15
13
15
CIRCUIT DESCRIPTION
input. This will keep surface leakage currents to a minimum and
The A5354CA is a low-current CMOS circuit
providing all of the required features for an
ionization-type smoke detector.
provide a method of measuring the input voltage without loading the
ionization chamber. The active guard amplifier is not power strobed
and thus provides constant protection from surface leakage currents.
The detector input has internal diode protection against static damage.
Oscillator. An internal oscillator operates
with a period of 1.67 seconds during no-
smoke conditions. Every 1.67 seconds,
internal power is applied to the entire circuit
and a check is made for smoke. Every 24
clock cycles (40 seconds), the LED is pulsed
and a check is made for low battery by
comparing VDD to an internal reference.
Because very-low currents are used in the
device, the oscillator capacitor at pin 12
should be a low-leakage type (PTFE, polysty-
rene, or polypropylene).
Alarm Circuitry. If smoke is detected, the oscillator period changes to
40 ms and the horn is enabled. The horn output is typically 160 ms
ON, 80 ms OFF. During the OFF time, smoke is again checked and
will inhibit further alarm output if smoke is not sensed. During smoke
conditions the low battery alarm is inhibited and the LED is driven at a
1 Hz rate.
Sensitivity Adjust. The detector sensitivity to smoke is set internally
by a voltage divider connected between VDD and VSS. The sensitivity
can be externally adjusted to the individual characteristics of the
ionization chamber by connecting a resistor between pin 13 and VDD, or
between pin 13 and VSS.
Detector Circuitry. When smoke is de-
tected, the resistor divider network that sets
the sensitivity (smoke trip point) is altered to
increase the sensitivity set voltage (pin 13)
by typically 130 mV with no external connec-
tions to pins 3 or 13. This provides hyster-
esis and reduces false triggering. An active
guard is provided on both pins adjacent to
the detector input (pin 15). The voltage at
pins 14 and 16 will be within 100 mV of the
Low Battery. The low battery threshold is set internally by a voltage
divider connected between VDD and VSS. The threshold can be in-
creased by connecting a resistor between pin 3 and VDD. The thresh-
old can be decreased by connecting a resistor between pin 3 and VSS.
The battery voltage level is checked every 40 seconds during the 10
mA, 10 ms LED pulse. If an LED is not used, it should be replaced
with an equivalent resistor (typically 500 Ω to 1000 Ω) such that the
battery loading remains at 10 mA.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5354
SMOKE DETECTOR
with INTERCONNECT
TYPICAL APPLICATION
200 kΩ
9 V
I/O. A connection is provided at pin 2 to
allow multiple smoke detectors to be
commoned. If any single unit detects smoke
(I/O is driven high), all connected units will
sound their associated horns after a nominal
3 second delay. The LED is suppressed
when an alarm is signaled from an intercon-
nected unit.
16
1
2
3
4
NC
200 Ω
PUSH
TO
TEST
15
14
13
12
11
10
9
LOGIC
TO
OTHER
UNITS
NOTE
2
NC
V
NOTE
1
OSC. &
TIMING
330 Ω
5
6
0.1 µF
Testing. On power up, all internal counters
are reset. Internal test circuitry allows for low
battery check by holding pins 8 and 12 low
during power up, then reducing VDD and
monitoring HORN1 (pin 10). All functional
tests can be accelerated by driving pin 12
with a 2 kHz square wave. The 10 ms strobe
period must be maintained for proper opera-
tion of the comparator circuitry.
DD
HORN
DRIVER
8.2 MΩ
7
8
1 µF
V
SS
0.001 µF
Dwg. EC-005-4
NOTE 1: An external resistor divider is used to adjust sensitivity for the
particular smoke chamber.
NOTE 2: A resistor to ground or VDD may be added to this pin to modify
low battery voltage threshold.
TIMING DIAGRAMS IN TYPICAL APPLICATION
NO ALARM
NO LOW BATTERY
STANDBY MODE
ALARM
NO LOW BATTERY
ALARM AND
LOW BATTERY
NO ALARM
LOW BATTERY
V12
OSC. CAP
10 ms
1.67 s
40 ms
INTERNAL
CLOCK
30 CLOCK CYCLES
24 CLOCK CYCLES
24 CLOCK CYCLES
LED
LED OFF
LED
ON
12 CLOCK CYCLES
6 CLOCK CYCLES
6 CLOCK CYCLES
SMOKE
COMPARATOR
SAMPLE
LOW BATTERY
WARNING
HORN
ON
HORN
OFF
V15 < V13 (SMOKE)
SMOKE
CHAMBER
V15 > V13 (NO SMOKE)
Dwg. WC-003
5354
SMOKE DETECTOR
with INTERCONNECT
I/O OPERATION
REMOTE ALARM MODE
1.67 s
40 ms
INTERNAL
CLOCK
4 CYCLES
2 CYCLES
HORN
ON
OFF
HORN
HORN NOT SELF COMPLETING
WHEN IN REMOTE ONLY ALARM
V2 IN
I/O
LOCAL ALARM MODE
INTERNAL
CLOCK
HORN
ON
OFF
HORN
72 CLOCK CYCLES
V2 OUT
I/O
Dwg. WC-004
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5354
SMOKE DETECTOR
with INTERCONNECT
Dimensions in Inches
(controlling dimensions)
0.014
0.008
9
16
0.430
MAX
0.280
0.240
0.300
BSC
1
8
0.100
0.070
0.045
0.005
BSC
MIN
0.775
0.735
0.210
MAX
0.015
0.150
0.115
MIN
0.022
0.014
Dwg. MA-001-16A in
Dimensions in Millimeters
(for reference only)
0.355
0.204
9
16
10.92
MAX
7.11
6.10
7.62
BSC
1
1.77
1.15
8
2.54
0.13
BSC
MIN
19.68
18.67
5.33
MAX
0.39
3.81
2.93
MIN
0.558
0.356
Dwg. MA-001-16A mm
NOTES: 1. Lead thickness is measured at seating plane or below.
2. Lead spacing tolerance is non-cumulative.
3. Exact body and lead configuration at vendor’s option within limits shown.
5354
SMOKE DETECTOR
with INTERCONNECT
SAFETY & SECURITY ICs
SELECTION GUIDE
Part
Number
Function
A3054KU/SU
A5347CA
A5348CA
A5349CA
A5354CA
A5355CA
A5358CA
Multiplexed Two-Wire Hall-Effect Sensor
Ionization-Type Smoke Detector with Interconnect and Timer
Ionization-Type Smoke Detector with Interconnect, Timer, and Reverse-Battery Protection
Ionization-Type Smoke Detector with Interconnect and Timer for AC Line Operation
Ionization-Type Smoke Detector with Interconnect and Reverse-Battery Protection
Ionization-Type Smoke Detector with Interconnect and Reverse-Battery Protection
Photoelectric-Type Smoke Detector with Interconnect and Timer
Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the
detail specifications as may be required to permit improvements in the design of its products.
The information included herein is believed to be accurate and reliable. However, Allegro
MicroSystems, Inc. assumes no responsibility for its use; nor for any infringements of patents or other
rights of third parties which may result from its use.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
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