Allegro A5350CA Datasheet

NO CONNECT.

I / O

LOW-V SET

NO CONNECT.

LED

+ SUPPLY

TIMING RES.

FEEDBACK

5350

required features for an ionization-type smoke detector. A networking

NC

1

2

3

4

5

6

7

89

NC

V

LOGIC

OSC. &
TIMING

DD

HORN

DRIVER

V

GUARD

16

15

14

13

12

11

10

SS

2

DETECT. IN

GUARD

1

SENSITIVITY
SET

OSC. CAP.

HORN

2

HORN

1

– SUPPLY

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.

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.

Data Sheet

26110.5*

SMOKE DETECTOR

WITH INTERCONNECT

The A5350CA is a low-current, CMOS circuit providing all of the

The internal oscillator and timing circuitry keeps standby power to

Dwg. PC-004-1

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,

V

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

IN

Input Current, I

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

IN

Operating Temperature Range,

T

..................................... 0°C to +50°C

A

Storage Temperature Range,

T

............................... -55°C to +125°C

S

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

DD

+ 0.3 V

The A5350CA 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.

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

Always order by complete part number: A5350CA .

5350

SMOKE DETECTOR
with INTERCONNECT

FUNCTIONAL BLOCK DIAGRAM AND TYPICAL APPLICATION

+ SUPPLY

9 V

+

3

LOW-V

SET

13

SENSITIVITY

SET

– SUPPLY

9

V

SS

V

DD

6

–
+

–
+

+
–

14

GUARD GUARD

DETECT.

12

15

IN

+V

I / O

2

LOGIC

16

V

DD

POWER-ON

OSCILLATOR

& TIMING

CONNECTION

RESET

1

NO

FEEDBACK

8

11

HORN

2

10

HORN

1

5

LED

TIMING RES.

7

OSC. CAP.

12

4

NO

CONNECTION

+V

+V

Dwg. FC-001-3

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

W
Copyright © 1995, 1999, Allegro MicroSystems, Inc.

5350

SMOKE DETECTOR
with INTERCONNECT

ELECTRICAL CHARACTERISTICS at TA = +25°C, VDD = 9.0 V, VSS = 0 V, C

= 0.1 µF,

12

R7 = 8.2 MΩ (unless otherwise noted).

Characteristic Pin Test Conditions Min. Typ. Max. Units

Test

Supply Voltage Range 6 Operating 6.0 9.0 12 V
Detector Input Current 15 0 to 40% RH, V

= 0 to 9.0 V — — ±1.0 pA

IN

Input Offset Voltage 14-15 Active Guard — — ±100 mV

16-15 Active Guard — — ±100 mV
15-13 Detect Comparator — — ±50 mV

Common Mode Range 14-15 Guard Amplifier 2.0 — V

13-15 Smoke Comparator 0.5 — V

Active Guard Impedance 14 to V

16 to V

SS

SS

Oscillator Period 12 No Alarm 1.34 1.67 2.00 s

Alarm 32 40 48 ms
Oscillator Pulse Width 12 8.0 10 12 ms
Low Voltage Threshold 6 T
Horn Output Voltage 10-11 I

= 0 to 50°C 7.2 — 7.8 V

A

= 16 mA, VDD = 9.0 V — 0.1 0.5 V

OUT

= 16 mA, VDD = 7.2 V — — 0.9 V

I

OUT

= -16 mA, VDD = 9.0 V 8.5 8.8 — V

I

OUT

= -16 mA, VDD = 7.2 V 6.3 — — V

I

OUT

Horn Output ON Time 10-11 Alarm 120 160 208 ms

Limits

- 0.5 V

DD

- 2.0 V

DD

—10—kΩ
— 500 — kΩ

Low Battery 8.0 10 12 ms
Horn Output OFF Time 10-11 Alarm 60 80 104 ms

Low Battery 32 40 48 s
LED Output ON Current 5 V

= 7.2 V, V

DD

= 1.0 V 10 — — mA

OUT

LED Output ON Time 5 8.0 10 12 ms
LED Output OFF Time 5 No Alarm, In Standby 32 40 48 s
I/O Current 2 No Alarm, V

Alarm, V

= VDD - 2.0 V 25 — 60 µA

I/O

= VDD - 2.0 V -7.5 — — mA

I/O

I/O Alarm Voltage 2 External “Alarm” In 3.0 — — V
I/O Delay 2 “Alarm” Out — 3.0 — s
Supply Current 6 V

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 V15 < V13.

15

13

= 9.0 V, No Alarm, No Loads — 5.0 9.0 µA

DD

= 12 V, No Alarm, No Loads — — 12 µA

V

DD