Sensors

Freescale Semiconductor

7

MC14568

Figure 5. MC14568 Typical Application Diagram

NOTE 1: The low voltage set point can be tailored to customer’s requirement with the use of an external resistor.

NOTE 2: The sensitivity adjustment set point can be tailored to the customer’s requirement during the timer

mode can with the use of an external resistor.

NOTE 3: The Smoke Reference set point can be tailored to the customer’s requirement with the use of an

external resistor.

9.0 V

50 k

Timer

Mode

To Other

Units

NOTE 1

330

8.2 M

1.0

µF

NOTE 2

1 M

1 M

Test

Ionization

Chamber

NOTE 3

0.1

µF

1.5 M

220 k

0.001

µF

Piezo

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

TIMO

I/O

LOW V

TIMSTRT

LED

VDD

TIMING RES

FDBCK

HI_Z

DET

LO_Z

SMK_REF

OSC

HORN 2

HORN 1

VSS