UTC7106

CMOS IC

13

QW-R502-018,B

TYPICAL APPLICATIONS (Continued)

OSC 1

OSC 2

OSC 3

TEST

REF HI

REF LO

COMMON

IN HI

IN LO

A-Z

BUFF

INT

V -

G2

C3

A3

G3

BP

40

39

38

37

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

TO PIN 1

91kΩ

100pF

0.1μF

0. 47μF

100kΩ 1MΩ

47kΩ

0. 22μF

SCALE

FACTOR

ADJUST

9V

TO DISPLAY

A sillicon diode-connected transistor has a temperature coefficient of about -2mV/

℃

.

Calibration is achieved by placing the sensing transistor in ice water and adjusting the

zeroing potentiometer for a 000.0 reading.The sensor should then be placed in boiling

water and the scale-factor potentiometer adjusted for a 100.0 reading

FIGURE 9. USED AS A DIGITAL CENTIGRADE THERMOMETER

0.01μF

100kΩ 220kΩ

22kΩ

ZERO

ADJUST

SILICON NPN

MPS 3704 OR

SIMILAR

TO BACKPLANE