A5350CA Allegro Microsystems Inc, A5350CA Datasheet - Page 2

• Manufacturer Part Number: A5350CA
• Description: IC SMOKE DETECTOR ION 16-DIP
• Manufacturer: Allegro Microsystems Inc
• Type: Smoke Detectorr

Specifications of A5350CA

• Input Type: Voltage
• Output Type: Voltage
• Interface: CMOS
• Current - Supply: 12µA
• Mounting Type: Through Hole
• Package / Case: 16-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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
▪ Inverted alarm polarity on DETECT IN
Package: 16-pin DIP (suffix A):
26110.5 Rev. 5
9 V
To / from
other units
Not to scale
1 μF
8.2 MΩ
200 Ω
B
330 Ω
1
2
3
4
5
6
7
8
NC
I/O
LOW-V SET
NC
LED
VDD
TIMING RES
FEEDBACK
Ionization Smoke Detector with Interconnect
A5350
SENSITIVITY SET
DETECT IN
OSC CAP
GUARD1
GUARD2
HORN2
HORN1
Typical Application
VSS
16
15
14
13
12
11
10
9
200 k Ω
0.1 μF
Description
The A5350 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 A5350 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.
1.5 MΩ
220 kΩ
C
200 k Ω
C
Push
to Test
4.7 MΩ
4.7 MΩ
A
0.001 μF
C
A
B
C
Use an external resistor divider to set
sensitivity for a particular smoke chamber.
A resistor to VSS or VDD may
be added to this pin to modify
low battery voltage threshold.
Value of component will vary, based on
the piezoelectric horn used.
A5350