06/09/20

3

ES51993

11,000 Counts ADC

Pin Description

Pin No

Symbol

Type

Description

1

CAZ

I

Auto-zero capacitor connection.

2

CINT

O

Integrator output. Connect to integral capacitor

3

CREF+

I/O Positive connection for reference capacitor.

4

CREF-

I/O Negative connection for reference capacitor.

5

REF+

I

Differential reference high voltage input.

6

REF-

I

Differential reference low voltage input.

7

BUF

O

Buffer output pin. Connect to integral resistor

8

RAZ

O

Buffer output pin in high-speed mode. Connect to high-speed integral

resistor.

9

PHin

I

Pick hold signal input which is reference to AGND

10

PMAX

O

Minimum peak hold output capacitor connection.

11

PMIN

O

Maximum peak hold output capacitor connection.

12

VIN+

I

Analog differential high signal input.

13

VIN1+

I

Analog signal high input1

14

VIN2+

I

Analog signal high input2

15

VIN-

I

Analog differential low signal input.

16

SDATA

I/O Serial data I/O pin. Nch open-drain output.

17

SCLK

I

Serial clock input pin.

18

EOC

O

An indicator for ADC conversion ending.

19

BUZOUT

O

Buzzer frequency output

20

uP_VCC

I

MPU I/O port power level selection

21

OSC2

O

Crystal oscillation connection

22

OSC1

I

Crystal oscillation connection

23

C-

O

Negative capacitor connection for on-chip DC-DC converter.

24

C+

O

Positive capacitor connection for on-chip DC-DC converter.

25

CS

I

Chip select input pin. Pull to Low to enter power down mode.

26

I/O_control

I

MPU I/O port ground level selection

27

LBAT

I

Low battery configuration. If 3V battery is used, connect it to AGND.

The default low-battery threshold voltage is –2.3V. If 9V or other

battery voltage is used, the low battery annunciator is displayed when

the voltage of this pin is less than V12

28

DGND

G

Digital ground

29

V+

O/P Output of on-chip DC-DC converter.

30

V-

P

Negative supply voltage. Connecting to 3V battery negative terminal.

31

AGND

G

Analog ground

32

V12

O

Output of band-gap voltage reference. Typically –1.23V