ALLEGRO 5364

Data Sheet
26110.7A
5364
SMOKE DETECTOR
WITH INTERCONNECT
NO CONNECT.
1
I/O
2
LOW-V SET
3
NO CONNECT.
4
LED
5
+ SUPPLY
6
TIMING RES.
7
FEEDBACK
8
NC
LOGIC
NC
V DD
OSC. &
TIMING
HORN
DRIVER
V SS
16
GUARD 2
15
DETECT. IN
14
GUARD 1
13
SENSITIVITY
SET
12
OSC. CAP.
11
HORN 2
10
HORN 1
9
– SUPPLY
Dwg. PC-004-1
The A5364CA 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.
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.
The A5364CA 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
A5368CA.
FEATURES
ABSOLUTE MAXIMUM RATINGS
(Voltages are referenced to VSS)
Supply Voltage Range,
VDD .......................... -0.5 V to +15 V
Reverse Battery (10.5 V) ................ 20 s
Input Voltage Range,
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.
■
■
■
■
■
■
■
■
Interconnect Up to 125 Detectors
Piezoelectric Horn Driver
Guard Outputs for Detector Input
Pulse Testing for Low Battery
Power-ON Reset
Internal Reverse Battery Protection
Built-In Hysteresis Reduces False Triggering
Temporal Horn Pattern
Always order by complete part number: A5364CA .
5364
SMOKE DETECTOR
WITH INTERCONNECT
FUNCTIONAL BLOCK DIAGRAM AND TYPICAL APPLICATION
+ SUPPLY V
I/O
DD
6
9V
2
+
V
FEEDBACK
DD
8
11
HORN
–
+
3
2
10
HORN 1
LOW-V
SET
LOGIC
+V
5
LED
13
POWER-ON
RESET
–
+
SENSITIVITY
SET
TIMING RES.
7
+V
OSC. CAP.
OSCILLATOR
& TIMING
12
–
+
– SUPPLY
9
V
SS
14
DETECT. 15
IN
16
GUARD 1
GUARD 2
1
4
NO
CONNECTION
NO
CONNECTION
+V
Dwg. FC-001-4
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1998, 1999 Allegro MicroSystems, Inc.
5364
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
Min.
Typ.
Max.
Units
Supply Voltage Range
6
Operating
6.0
9.0
12
V
Detector Input Current
15
0 to 40% RH, VIN = 0 to 9.0 V
—
—
±1.0
pA
14-15
Active Guard
—
—
±100
mV
16-15
Active Guard
—
—
±100
mV
15-13
Detect Comparator
—
—
±50
mV
13
No Alarm to Alarm
90
130
170
mV
14-15
Guard Amplifier
2.0
—
VDD - 0.5
V
13-15
Smoke Comparator
0.5
—
VDD - 2.0
V
14
to VSS
—
10
—
kΩ
16
to VSS
—
500
—
kΩ
12
No Alarm
1.34
1.67
2.00
s
32
40
48
ms
8.0
10
12
ms
Input Offset Voltage
Hysteresis
Common Mode Range
Active Guard Impedance
Oscillator Period
Alarm
Oscillator Pulse Width
4
Low Voltage Threshold
6
TA = 0 to 50°C
7.2
—
7.8
V
Sensitivity Adj. Voltage
13
V13/VDD, pin 13 open circuit
48.5
50
51.5
%
IOUT = 16 mA, VDD = 9.0 V
—
0.1
0.5
V
IOUT = 16 mA, VDD = 7.2 V
—
—
0.9
V
IOUT = -16 mA, VDD = 9.0 V
8.5
8.8
—
V
IOUT = -16 mA, VDD = 7.2 V
6.3
—
—
V
Alarm (see figure, time “A”)
450
500
550
ms
Low Battery
8.0
10
12
ms
Alarm (see figure, time “B”)
450
500
550
ms
Alarm (see figure, time “C”)
1350
1500
1650
ms
Low Battery
32
40
48
s
Horn Output Voltage
Horn Output ON Time
Horn Output OFF Time
10-11
10-11
10-11
LED Output ON Current
5
VDD = 7.2 V, VOUT = 1.0 V
10
—
—
mA
LED Output ON Time
5
No Local Alarm; Not Latched
8.0
10
12
ms
LED Output OFF Time
5
No Alarm, In Standby
32
40
48
s
NOTE 1:
NOTE 2:
Continued next page . . .
Negative current is defined as coming out of (sourcing) the specified device pin.
Alarm (Smoke) Condition is defined as V15 < V13; No Alarm (No Smoke) Condition as V15 > V13.
www.allegromicro.com
5364
SMOKE DETECTOR
WITH INTERCONNECT
ELECTRICAL CHARACTERISTICS (continued)
Limits
Test
Characteristic
I/O Current
Pin
2
Test Conditions
Min.
Typ.
Max.
Units
25
—
60
µA
Alarm, VI/O = VDD - 2.0 V
-7.5
—
—
mA
No Alarm, VI/O = VDD - 2.0 V
I/O Alarm Voltage
2
External “Alarm” In
3.0
—
—
V
I/O Delay
2
“Alarm” Out
—
3.0
—
s
Supply Current
6
VDD = 9.0 V, No Alarm, No Loads
—
5.0
9.0
µA
VDD = 12 V, No Alarm, No Loads
—
—
12
µA
NOTE 1:
NOTE 2:
Negative current is defined as coming out of (sourcing) the specified device pin.
Alarm (Smoke) Condition is defined as V15 < V13; No Alarm (No Smoke) Condition as V15 > V13.
CIRCUIT DESCRIPTION
The A5364CA is a low-current CMOS circuit
providing all of the required features for an
ionization-type smoke detector.
Oscillator. An internal oscillator operates
with a period of 1.67 seconds during nosmoke 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, polystyrene, or polypropylene).
Detector Circuitry. When smoke is
detected, 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 connections to pins 3 or 13. This provides hysteresis
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 input.
This will keep surface leakage currents to a minimum and 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.
Alarm Circuitry. If smoke is detected, the oscillator period changes
to 40 ms and the horn is enabled. The horn output is typically 0.5 s
ON, 0.5 s OFF, 0.5 s ON, 0.5 s OFF, 0.5 s ON, 1.5 s OFF (temporal
horn pattern). During the OFF time, smoke is 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.
Low Battery. The low battery threshold is set internally by a voltage
divider connected between VDD and VSS. The threshold can be increased by connecting a resistor between pin 3 and VDD. The threshold
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
5364
SMOKE DETECTOR
WITH INTERCONNECT
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 interconnected
unit.
TYPICAL APPLICATION
1
200 kΩ
200 kΩ
9V
16
NC
200 Ω
2
3
4
14
NC
330 Ω
5
6
12
V DD
8.2 MΩ
8
0.1 µF
11
HORN
DRIVER
7
1 µF
NOTE
1
13
OSC. &
TIMING
10
V SS
9
330 kΩ
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 operation of the comparator circuitry.
NOTE
2
PUSH
TO
TEST
15
LOGIC
1 MΩ
TO
OTHER
UNITS
0.001 µF
Dwg. EC-005-4
NOTE 1: Use an external resistor to adjust sensitivity for a particular smoke
chamber.
NOTE 2: A resistor to ground or VDD may be added to this pin to modify low
battery voltage threshold.
TIMING DIAGRAM IN TYPICAL APPLICATION
NO ALARM
NO LOW BATTERY
STANDBY MODE
ALARM AND
LOW BATTERY
ALARM
NO LOW BATTERY
NO ALARM
LOW BATTERY
V12
OSC. CAP
10 ms
1.67 s
40 ms
24 CLOCK CYCLES
INTERNAL
CLOCK
24 CLOCK CYCLES
LED
30 CLOCK CYCLES
19 CLOCK CYCLES
LED OFF
LED
ON
24 CLOCK CYCLES
13 CLOCK
CYCLES
SMOKE
COMPARATOR
SAMPLE
HORN
SMOKE
CHAMBER
12 CLOCK
CYCLES
12 CLOCK
CYCLES
HORN
ON TIME
"A"
HORN
OFF TIME
"B"
36 CLOCK CYCLES
LOW BATTERY
WARNING
HORN OFF TIME
"C"
V15 < V13 (SMOKE)
V15 > V13 (NO SMOKE)
SHADED AND UNSHADED AREAS
ARE DIFFERENT TIME SCALES
I/O
73 CLOCK CYCLES
Dwg. WC-003-3
www.allegromicro.com
5364
SMOKE DETECTOR
WITH INTERCONNECT
I/O OPERATION
REMOTE ALARM MODE
NO LOW BATTERY
1.67 s
40 ms
INTERNAL
CLOCK
12 CLOCK
CYCLES
HORN
V2 IN
I/O
HORN CYCLE NOT SELF COMPLETING
AFTER REMOTE OR LOCAL ALARM CONDITION IS REMOVED
SHADED AND UNSHADED AREAS
ARE DIFFERENT TIME SCALES
SINGLE HORN PULSE IN PROGRESS IS SELF COMPLETING
AFTER LOCAL ALARM CONDITION IS REMOVED
LOCAL ALARM MODE
NO LOW BATTERY
INTERNAL
CLOCK
12 CLOCK
CYCLES
HORN
72 CLOCK CYCLES
V2 OUT
I/O
Dwg. WC-004-2
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
5364
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
0.070
0.045
0.100
0.775
0.735
8
0.005
BSC
MIN
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
2.54
19.68
18.67
BSC
8
0.13
MIN
5.33
MAX
0.39
3.81
2.93
MIN
0.558
0.356
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.
www.allegromicro.com
Dwg. MA-001-16A mm
5364
SMOKE DETECTOR
WITH INTERCONNECT
SAFETY & SECURITY ICs
Part
Number
A3054KU/SU
A5348CA
A5349CA
A5350CA
A5354CA
A5358CA
A5364CA
A5368CA
Function
Multiplexed two-wire Hall-effect sensor
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
Ionization-type smoke detector with interconnect, reverse-battery protection,
and temporal horn pattern
Ionization-type smoke detector with interconnect, timer, reverse-battery protection,
and temporal horn pattern
The products described here are manufactured under one or more
U.S. patents or U.S. patents pending.
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 performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.
Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.
The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsibility for its use; nor for any infringement 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