SMOKE DETECTOR

WITH INTERCONNECT

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.

Always order by complete part number: A5364CA .

Data Sheet

26110.7A

ABSOLUTE MAXIMUM RATINGS

(Voltages are referenced to V

)

Supply Voltage Range,

.......................... -0.5 V to +15 V

Reverse Battery (10.5 V) ................ 20 s
Input Voltage Range,

.................. -0.3 V to V

+ 0.3 V

Input Current, I

........................ 10 mA

Operating Temperature Range,

............................... 0

C to +50

Storage Temperature Range,

......................... -55

C to +125

CAUTION: CMOS devices have input static
protection but are susceptible to damage
when exposed to extremely high static
electrical charges.

LOGIC

OSC. &
TIMING

HORN

DRIVER

GUARD

DETECT. IN

GUARD

SENSITIVITY
SET

OSC. CAP.

HORN

SUPPLY

NO CONNECT.

I / O

LOW-V SET

NO CONNECT.

LED

+ SUPPLY

TIMING RES.

FEEDBACK

Dwg. PC-004-1

FEATURES

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

5364

5364

SMOKE DETECTOR

WITH

INTERCONNECT

www.allegromicro.com

Test

Limits

Characteristic

Pin

Test Conditions

Min.

Typ.

Max.

Units

Supply Voltage Range

Operating

6.0

9.0

Detector Input Current

0 to 40% RH, V

= 0 to 9.0 V

±1.0

Input Offset Voltage

14-15

Active Guard

±100

16-15

Active Guard

±100

15-13

Detect Comparator

±50

Hysteresis

No Alarm to Alarm

130

170

Common Mode Range

14-15

Guard Amplifier

2.0

- 0.5

13-15

Smoke Comparator

0.5

- 2.0

Active Guard Impedance

to V

500

Oscillator Period

No Alarm

1.34

1.67

2.00

Alarm

Oscillator Pulse Width

8.0

Low Voltage Threshold

= 0 to 50

°C

7.2

7.8

Sensitivity Adj. Voltage

, pin 13 open circuit

48.5

51.5

Horn Output Voltage

10-11

OUT

= 16 mA, V

= 9.0 V

0.1

0.5

OUT

= 16 mA, V

= 7.2 V

0.9

OUT

= -16 mA, V

= 9.0 V

8.5

8.8

OUT

= -16 mA, V

= 7.2 V

6.3

Horn Output ON Time

10-11

Alarm (see figure, time "A")

450

500

550

Low Battery

8.0

Horn Output OFF Time

10-11

Alarm (see figure, time "B")

450

500

550

Alarm (see figure, time "C")

1350

1500

1650

Low Battery

LED Output ON Current

= 7.2 V, V

OUT

= 1.0 V

LED Output ON Time

No Local Alarm; Not Latched

8.0

LED Output OFF Time

No Alarm, In Standby

ELECTRICAL CHARACTERISTICS at T

= +25

C, V

= 9.0 V, V

= 0 V, C

= 0.1

= 8.2 M

(unless otherwise noted).

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

5364
SMOKE DETECTOR

WITH

INTERCONNECT

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

I/O Current

No Alarm, V

I/O

= V

- 2.0 V

µA

Alarm, V

I/O

= V

- 2.0 V

-7.5

I/O Alarm Voltage

External "Alarm" In

3.0

I/O Delay

"Alarm" Out

3.0

Supply Current

= 9.0 V, No Alarm, No Loads

5.0

9.0

µA

= 12 V, No Alarm, No Loads

µA

Test

Limits

Characteristic

Pin

Test Conditions

Min.

Typ.

Max.

Units

ELECTRICAL CHARACTERISTICS (continued)

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 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 V

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).

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 connec-
tions 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 inter-
nally by a voltage divider connected between V

and V

. The

sensitivity can be externally adjusted to the individual characteristics of
the ionization chamber by connecting a resistor between pin 13 and
V

, or between pin 13 and V

Low Battery. The low battery threshold is set internally by a voltage
divider connected between V

and V

. The threshold can be in-

creased by connecting a resistor between pin 3 and V

. The threshold

can be decreased by connecting a resistor between pin 3 and V

. 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

to 1000 ) such that the battery

loading remains at 10 mA.

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

5364

SMOKE DETECTOR

WITH

INTERCONNECT

www.allegromicro.com

19 CLOCK CYCLES

1.67 s

NO ALARM

NO LOW BATTERY

STANDBY MODE

10 ms

40 ms

24 CLOCK CYCLES

V15 > V13 (NO SMOKE)

V15 < V13 (SMOKE)

V12

OSC. CAP

INTERNAL

CLOCK

LED

SMOKE

COMPARATOR

SMOKE

CHAMBER

HORN

SAMPLE

ALARM

NO LOW BATTERY

30 CLOCK CYCLES

LOW BATTERY
WARNING

HORN

ON TIME

"A"

ALARM AND

LOW BATTERY

NO ALARM

LOW BATTERY

Dwg. WC-003-3

24 CLOCK CYCLES

LED OFF

LED
ON

12 CLOCK

CYCLES

12 CLOCK

CYCLES

36 CLOCK CYCLES

HORN

OFF TIME

"B"

13 CLOCK

CYCLES

24 CLOCK CYCLES

73 CLOCK CYCLES

I/O

SHADED AND UNSHADED AREAS

ARE DIFFERENT TIME SCALES

HORN OFF TIME

"C"

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.

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 V

and

monitoring HORN

(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.

TYPICAL APPLICATION

OTHER

UNITS

NOTE

LOGIC

OSC. &
TIMING

HORN

DRIVER

Dwg. EC-005-4

9 V

PUSH

TEST

200 k

200

8.2 M

µF

0.1

µF

1 M

330 k

0.001

µF

330

NOTE 1: Use an external resistor to adjust sensitivity for a particular smoke

chamber.

NOTE 2: A resistor to ground or V

may be added to this pin to modify low

battery voltage threshold.

TIMING DIAGRAM IN TYPICAL APPLICATION

5364

SMOKE DETECTOR

WITH

INTERCONNECT

www.allegromicro.com

Dimensions in Inches

(controlling dimensions)

Dimensions in Millimeters

(for reference only)

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.

0.014
0.008

0.300

BSC

Dwg. MA-001-16A in

0.430

MAX

0.280
0.240

0.210

MAX

0.070
0.045

0.015

MIN

0.022
0.014

0.100

BSC

0.005

MIN

0.150
0.115

0.775
0.735

0.355
0.204

7.62

BSC

Dwg. MA-001-16A mm

10.92

MAX

7.11
6.10

5.33

MAX

1.77
1.15

0.39

MIN

0.558
0.356

2.54

BSC

0.13

MIN

3.81
2.93

19.68
18.67

5364
SMOKE DETECTOR

WITH

INTERCONNECT

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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 responsi-
bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.

SAFETY & SECURITY ICs

Part

Number

Function

A3054KU/SU

Multiplexed two-wire Hall-effect sensor

A5348CA

Ionization-type smoke detector with interconnect, timer, and reverse-battery protection

A5349CA

Ionization-type smoke detector with interconnect and timer for ac line operation

A5350CA

Ionization-type smoke detector with interconnect and reverse-battery protection

A5354CA

Ionization-type smoke detector with interconnect and reverse-battery protection

A5358CA

Photoelectric-type smoke detector with interconnect and timer

A5364CA

Ionization-type smoke detector with interconnect, reverse-battery protection,

and temporal horn pattern

A5368CA

Ionization-type smoke detector with interconnect, timer, reverse-battery protection,

and temporal horn pattern

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