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A5348: Ionization Smoke Detector with Interconnect and Timer (PDF)
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A5348
Ionization Smoke Detector with Interconnect and Timer
Features
- 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
- Timer (Hush) mode for enabling reduced sensitivity period
- Built-in hysteresis reduces false triggering
Description
The A5348 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 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 sensor ICs or a switch for the ionization detector, this very-low–power device can be used in numerous other battery-operated safety/security applications.
The A5348 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.
Functional Block Diagram
| Part Number | Package Type | RoHS Compliant |
Part Composition/ RoHS Data |
Temperature | Comments | Samples | Distributor Stock |
|---|---|---|---|---|---|---|---|
| A5348CA-T | 16-pin DIP | Yes | view data | -10 °C to 60 °C |
Contact Local Sales Representative or check distributor stock |
Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.