M7206

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 8

www.unisonic.com.tw

QW-R502-Q37.A

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PIN CONFIGURATIONS

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PIN DESCRIPTION

PIN

NAME

TYPE

PIN DESCRIPTION

1

BZ

O

Piezo buzzer output. Whenever BZEN is connected to V+ and

differential inputs are tied together, BZ will generate a 5KHz sound

output.

2

BZEN

I

Buzzer control slave input. This pin is internally pulled-down to

TEST.See BZ

3

TEST

-

Digital GND. Pull high to V+ all LCD segments will be activated.

4

OSC3

-

Crystal oscillator connection. (RC)

5

HOLD

O

Hold control pin. When it receives a negative mud pulse, display hold;

Receive again then function disabled.

6

OSC2

-

Crystal oscillator connection. (output)

7

OSC1

-

Crystal oscillator connection. (input)

8

V+

P

Positive supply voltage

9～15

A1~G1

O

LCD segment drive (unit)

16～21、32

A2~G2

O

LCD segment drive (decade)

22~25, 29~31

A3~G3

O

LCD segment drive (hundred)

26

AB4

O

LCD segment drive (thousand). When the readout exceeds 1999, AB4

drive the segment of thousand to display ‘1’ for showing excess.

27

POL

O

LCD segment drive. (minus ‘-‘)

28

BP

O

LCD common drive.

33

LOWB

O

LCD segment drive. (low battery)

34

V-

P

Negative supply voltage. Connecting to battery negative terminal.

35

INT

-

Integrator output.

36

BUFF

-

Integration register connection

37

A/Z

-

Auto-zero capacitor connection

38

IN LO

I

Analog low input signal

39

IN HI

I

Analog high input signal

40

COMMON

O

Set the common-mode voltage for the system

41

C-REF-

-

Negative capacitor connection for on-chip A/D converter

42

C-REF+

-

Positive capacitor connection for on-chip A/D converter

43

REF LO

I

Low differential reference input connection.

44

REF HI

I

High differential reference input connection