M7240

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 7

www.unisonic.com.tw

QW-R502-682.a

PIN CONFIGURATIONS

PIN DESCRIPTION

PIN

NAME

TYPE

PIN DESCRIPTION

1～3、41～44

A1~G1

O

LCD segment drive

4～9、21

A2~G2

O

LCD segment drive

10~13、18~20

A3~G3

O

LCD segment drive

14

AB4

O

LCD segment drive

15

POL

O

LCD Drive display minus "-"

16

BP

O

LCD public driver

17

BP_

O

BP signal output terminals, inverse for LCD display decimal and other

special symbols of liquid crystal display driver

22

LB

O

Low battery flag. Pull high if low battery

23

V-

-

Negative voltage

24

INT

-

Integrator output

25

BUF

-

Integration register connection.

26

AZ

-

Auto-zero capacitor connection

27

INLO

I

Analog low input signal

28

INHI

I

Analog high input signal

29

COM

-

Set the common-mode voltage for the system

30

CRF-

-

Negative capacitor connection for on-chip A/D converter

31

CRF+

-

Positive capacitor connection for on-chip A/D converter

32

RFLO

I

Low differential reference input connection.

33

RFHI

I

High differential reference input connection

34

HLDO

Keep output terminal display

35

Rx

-

The clock frequency adjustment, through a resistance to V + adjustable

reduce chip clock frequency

36

HOLD

Hold input pin. Connecting to V+ for hold function

37

CAP-

Negative voltage capacitance connection negative terminals

38

GND

I

Ground

39

CAP+

Negative voltage capacitance connection positive terminals

40

V+

I

Positive supply voltage.