MC14468 データシートの表示（PDF） - Freescale Semiconductor

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MC14468

Low-Power CMOS Ionization Smoke Detector IC with Interconnect

Freescale Semiconductor 

Standby

No Smoke/

No Low Battery

OSCILLATOR

(Pin 12)

DETECT OUT

(Pin 1)

LOW BATTERY

(Internal)

HYSTERESIS (Internal)

(Pin 13) (Pin 14)

SAMPLE (Internal)

Smoke

Low = Disable

HORN High = Enable

(Pin 10 and 11)

LED

(Pin 5)

STROBE OUT

(Pin 14)

I/O (Pin 2)

Output (Local)

I/O (Pin 2)

Input (Remote)

24 Clock Cycles

(40S)

Smoke/No Low Battery

Smoke/Low Battery

40 ms

10 ms

No Smoke/Low Battery

1.67 s

Battery Test

(Note 3)

(Note 1)

Suppressed Chirp

24 Clock Cycles (0.96 s)

24 Clock Cycles

(Note 3)

6 Clock

Cycles (10.0 s)

Note: Horn Modulation Not Self-Completing

LED

(Suppressed LED for Remote Only)

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 on once per clock cycle (1.67 s for no smoke, 40 ms for smoke).

3. Low battery comparator information is latched only during LED pulse.

4. ~ 100 mV p-p swing.

Figure 7. Timing Diagram

MC14468

6

Sensors

Freescale Semiconductor

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