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MCZ145017EG bảng dữ liệu(PDF) 5 Page - Freescale Semiconductor, Inc |
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MCZ145017EG bảng dữ liệu(HTML) 5 Page - Freescale Semiconductor, Inc |
5 / 10 page Sensors Freescale Semiconductor 5 MC145017 battery, respectively. Pin 1 = VDD for smoke and Pin 4 = VDD for low battery. In this mode and during the 10 ms power strobe, chip current rises to approximately 50 µA. Led Pulse The 9-volt battery level is checked every 40 seconds during the LED pulse. The battery is loaded via a 10 mA pulse for 11.6 ms. If the LED is not used, it should be replaced with an equivalent resistor such that the battery loading remains at 10 mA. Hysteresis When smoke is detected, the resistor/divider network that sets sensitivity is altered to increase sensitivity. This yields approximately 100 mV of hysteresis and reduces false triggering. Figure 6. Typical Application as Ionization Smoke Detector Figure 7. MC145017 Timing Diagram MC145017 116 2 3 4 5 6 7 8 15 14 13 12 11 10 9 330 Ω 8.2 M Ω + 9 V 0.1 µF 1.5 M Ω* 0.001 µF 220 k Ω* 0.1 µF 1 M 1 M Test *NOTE: Component values may change depending on type of piezoelectric horn used. OSC Pin 12 Smoke - N - Y Low Bat - Y - N HYST Pin 13 HORN - On - Off LED - Off - On 23 4 5 6 7 9 8 1 No Smk No Low Bat LOW BATTERY CHIRP OSC Pin 12 Smoke - N - Y No Smk 23 24 1 6 12 18 24 Smoke Latch Alarm Condition ( 100 mV Level Shift) NFPA MOD LOW BAT - Y - N HORN - ON - OFF LED - OFF - ON (Note 1) 24 Clocks 24 Clocks No Smoke, Low Battery >> >> NOTES: 1. Horn modulation is self-completing. When going from smoke to no smoke, the alarm condition will terminate only when horn is off. 2. Comparators are strobed once per cycle (1.65 sec for no smoke, 40 msec for smoke). |
Số phần tương tự - MCZ145017EG |
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Mô tả tương tự - MCZ145017EG |
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