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5347 Datasheet(PDF) 4 Page - Allegro MicroSystems |
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5347 Datasheet(HTML) 4 Page - Allegro MicroSystems |
4 / 8 page 5347 SMOKE DETECTOR with INTERCONNECT and TIMER 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 Limits Characteristic Pin Test Conditions Min. Typ. Max. Units ELECTRICAL CHARACTERISTICS continued Timer Out Output Current 4 V OUT = 0.5 V 500 — — µA LED Output ON Current 5 V DD = 7.2 V, V OUT = 1.0 V 10 — — mA LED Output ON Time 5 8.0 10 12 ms LED Output OFF Time 5 No Alarm, In Standby 32 40 48 s No Alarm, Timer Mode After Pin 1 High-to-Low 8.0 10 12 s I/O Current 2 No Alarm, V I/O = V DD - 2.0 V 25 — 60 µA Alarm, V I/O = V DD - 2.0 V -7.5 — — mA I/O Alarm Voltage 2 External “Alarm” In 3.0 — — V I/O Delay 2 “Alarm” Out — 3.0 — s Supply Current 6 V DD = 9.0 V, No Alarm, No Loads — 5.0 9.0 µA V DD = 12 V, No Alarm, No Loads — — 12 µA NOTE 1: Negative current is defined as coming out of (sourcing) the specified device pin. NOTE 2: Alarm (Smoke) Condition is defined as V 15 < V 13 ; No Alarm (No Smoke) Condition as V 15 > V 13 . Test CIRCUIT DESCRIPTION The A5347CA is a low-current CMOS circuit providing all of the required features for an ionization-type smoke detector. Oscillator. An internal oscillator operates with a period of 1.67 seconds during no-smoke conditions. Every 1.67 seconds, internal power is applied to the entire circuit and a check is made for smoke. Every 24 clock cycles (40 seconds), the LED is pulsed and a check is made for low battery by comparing VDD to an internal reference. Since very-low currents are used in the device, the oscillator capacitor at pin 12 should be a low-leakage type (PTFE, polystyrene, or polypropylene). Detector Circuitry. When smoke is detected, the resistor divider network that sets the sensitivity (smoke trip point) is altered to increase the sensitivity set voltage (pin 13) by typically 130 mV with no external connections to pins 3 or 13. This provides hysteresis and reduces false triggering. An active guard is provided on both pins adjacent to the detector input (pin 15). The voltage at pins 14 and 16 will be within 100 mV of the input. This will keep surface leakage currents to a minimum and provide a method of measuring the input voltage without loading the ionization chamber. The active guard amplifier is not power strobed and thus provides constant protection from surface leakage currents. The detector input has internal diode protection against static damage. |
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