TheA5367 and A5348are low-current smoke detector IC’s that provide all of the required features for an ionization-type smoke detector. 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.
TheA5367is 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. These devices are recognized by Underwriters Laboratories for use in smoke alarms that comply with Standard UL217 or UL268, per file #S2113.
