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A5364CA Datasheet(PDF) 5 Page - Allegro MicroSystems |
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A5364CA Datasheet(HTML) 5 Page - Allegro MicroSystems |
5 / 8 page 5364 SMOKE DETECTOR WITH INTERCONNECT www.allegromicro.com 19 CLOCK CYCLES 1.67 s NO ALARM NO LOW BATTERY STANDBY MODE 10 ms 40 ms 24 CLOCK CYCLES V15 > V13 (NO SMOKE) V15 < V13 (SMOKE) V12 OSC. CAP INTERNAL CLOCK LED SMOKE COMPARATOR SMOKE CHAMBER HORN SAMPLE ALARM NO LOW BATTERY 30 CLOCK CYCLES LOW BATTERY WARNING HORN ON TIME "A" ALARM AND LOW BATTERY NO ALARM LOW BATTERY Dwg. WC-003-3 24 CLOCK CYCLES LED OFF LED ON 12 CLOCK CYCLES 12 CLOCK CYCLES 36 CLOCK CYCLES HORN OFF TIME "B" 13 CLOCK CYCLES 24 CLOCK CYCLES 73 CLOCK CYCLES I/O SHADED AND UNSHADED AREAS ARE DIFFERENT TIME SCALES HORN OFF TIME "C" I/O. A connection is provided at pin 2 to allow multiple smoke detectors to be commoned. If any single unit detects smoke (I/O is driven high), all connected units will sound their associated horns after a nominal 3 second delay. The LED is suppressed when an alarm is signaled from an interconnected unit. Testing. On power up, all internal counters are reset. Internal test circuitry allows for low battery check by holding pins 8 and 12 low during power up, then reducing V DD and monitoring HORN 1 (pin 10). All functional tests can be accelerated by driving pin 12 with a 2 kHz square wave. The 10 ms strobe period must be maintained for proper opera- tion of the comparator circuitry. TYPICAL APPLICATION TO OTHER UNITS NOTE 1 NOTE 2 1 2 3 4 5 6 7 89 10 11 12 13 14 15 16 LOGIC OSC. & TIMING HORN DRIVER V DD Dwg. EC-005-4 V SS 9 V PUSH TO TEST 200 k Ω 200 Ω 8.2 M Ω 1 µF 0.1 µF 0.001 µF 330 Ω NC NC NOTE 1: Use an external resistor to adjust sensitivity for a particular smoke chamber. NOTE 2: A resistor to ground or V DD may be added to this pin to modify low battery voltage threshold. TIMING DIAGRAM IN TYPICAL APPLICATION |
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