a5349 Allegro MicroSystems, Inc., a5349 Datasheet
a5349
Available stocks
Related parts for a5349
a5349 Summary of contents
Page 1
... The A5349 is supplied in a low-cost 16-pin dual in-line plastic package (DIP rated for continuous operation over the temperature range of 0°C to 50°C. The Pb (lead) free version (suffix – ...
Page 2
... A5349 Selection Guide Part Number Pb-Free A5349CA-T Yes A5349CA – Absolute Maximum Ratings* Characteristic Supply Voltage Range Input Voltage Range Input Current Operating Ambient Temperature Junction Temperature Storage Temperature Range * CAUTION: CMOS devices have input static protection but are susceptible to damage when exposed to extremely high static electrical charges. ...
Page 3
... A5349 +Supply 9V VDD LSSamp Low Supply Sample LOW-V SET SENSITIVITY SET SSamp Smoke Sample -Supply VSS AC Ionization Smoke Detector Functional Block Diagram I Band Gap Low Supply 600 kΩ Comparator _ Logic + 500 kΩ Smoke Comparator LSSamp 1.1 MΩ SSamp Oscillator and Timing ...
Page 4
... A5349 ELECTRICAL CHARACTERISTICS R = 8.2 MΩ (unless otherwise noted) TIMINGRES Characteristic Symbol Supply Voltage Range V DD Supply Current I DD Detector Input Current I DETECTIN V OS(GUARD1) Input Offset Voltage V OS(GUARD2 Hysteresis V HYS V CM(guard) Common Mode Range AG1 Active Guard Impedance Z AG2 t osc ...
Page 5
... Detector Circuitry When the voltage on the DETECT IN pin is less than the volt- age on the SENSITIVITY SET pin, the A5349 evaluates this as a smoke condition. During a smoke condition, the resistor divider network that sets the sensitivity (also referred to as the smoke trip ...
Page 6
... If the level of smoke increases such that the reduced-sensitivity level is reached, the A5349 will signal an Alarm condition. If such an Alarm condition does occur, the timer will still continue to com- pletion of its cycle. If Timer mode will not be used, the TIMER START pin should be tied to VSS ...
Page 7
... A5349 Standby Mode OSC CAP Pin Internal Clock Smoke Sample Low Supply Test LED Pin Timer Mode Internal Clock TIMER START Pin TIMER OUT Pin LED Pin Horn Enable Low Supply Condition VDD Pin Low SupplyTest LED Pin Horn Enable AC Ionization Smoke Detector ...
Page 8
... A5349 Local Smoke Detection/Test Alarm Condition Test event Smoke Sample Smoke Chamber LED Pin Horn Enable I/O Pin Remote Alarm Condition LED Pin Horn Enable I/O Pin AC Ionization Smoke Detector with Interconnect and Timer t osc(alarm) OSC CAP Pin Internal Clock Smoke Sample 6 clock cycles V < ...
Page 9
... A5349 A .005 [1.27] Allegro MicroSystems offers an industry-leading range of ionization and photoelectric smoke detector ICs. For a current listing, please visit our website at: Copyright ©1995-2007, Allegro MicroSystems, Inc. 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 de par tures from the detail spec tions as may be required to per- mit improvements in the per for mance, reliability, or manufacturability of its products ...