MC14568 查看數據表（PDF） - Freescale Semiconductor

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MC14568

Low-Power CMOS Ionization Smoke Detector with Interconnect and Timer

Freescale Semiconductor 

Pin 12 OSC CAP

Pin 1 TIMER START

Internal Clock

Time

Check for Smoke Window

231 Clock Cycles

Time

Time

Pin 4 TIMER OUT

Time

Pin 5 LED

6 Clock Cycles

Time

Figure 3. MC14568 Timing Diagram for the Timer Circuit

NO SMOKE

Time

10 ms

1.67 s

Check for Smoke Window

SMOKE

40 ms

Time

10 ms

Check for Smoke Window

Figure 4. MC14568 Oscillator Waves in Stand By and Smoke Conditions

MC14568

6

Sensors

Freescale Semiconductor

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