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MC14468

Low-Power CMOS Ionization Smoke Detector IC with Interconnect

Motorola => Freescale 

MC14468

Standby

No Smoke/

No Low Battery

Oscillator

(Pin 12)

Detect Out

(Pin 1)

Low Battery

(Internal)

Freescale Semiconductor, Inc.

Smoke/No Low Battery

Smoke/Low Battery

40 ms

10 ms No Smoke/Low Battery

1.67 s

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)

24 Clock Cycles

(40S)

Battery Test

24 Clock Cycles (0.96 s)

(Note 3)

(Note 1)

Suppressed Chirp

24 Clock Cycles

(Note 3)

6 Clock

Cycles (10.0 s)

I/O (Pin 2)

Output (Local)

I/O (Pin 2)

Input (Remote)

Note: Horn Modulation Not Self–Completing

LED

(Suppressed LED for Remote Only)

Figure 6. Timing Diagram

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).

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

4. 100 mV p–p swing.

6

For More Information On This Product, Motorola Sensor Device Data

Go to: www.freescale.com

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