6.

Pin Description

Name

Attribute

Pin No

Description

FTB

AIO

1

ADC Pre-Filter Capacitor Connection and input high

FTC

AIO

2

ADC Pre-Filter Capacitor Connection and input low

OPO

AIO

3

OPAMP Output

OPN

AIO

4

OPAMP Negative Input

OPP

AIO

5

OPAMP Positive Input

VRL

AIO

6

Input Reference Voltage low of the ADC

SGND

AI

7

Signal Ground

VRH

AI

8

Input Reference Voltage high of the ADC

AGND

APIO

9

Analog Ground

VS

APO

10

Voltage source

VSSA

API

11

Analog Negative Power Supply

VDD

PI

12

Positive Power Supply

VSS

API

13

Digital Negative Power Supply

VCC

DPO

14

Power Supply for Digital Signal

XTALO

DO

15

4MHz Oscillator Output

XTALI

DI

16

4MHz Oscillator Input

SDO/IRQO

DO

17

SPI Data Output or interrupt request output

SDI

DI

18

SPI Data Input

SCLK

DI

19

SPI Clock Input

/CS

DIO

20

Chip select of Digital Interface

Notations: D stands for Digital. A stands for Analog. P stands for Power. O stands for Output. I stands for Input.

For example: DIO means “Digital Input/Output”.

7.

Functional Block Diagram

CS

OPP

SGND

OPAMP

& Network

ΔΣ Modulator

Clock Generator

Digital

Filter

Power system

Digital Interface

and Control Registors

XTALI

XTALO

VRL

VDD

VS

VSS

AGND

DI

SK

OPO

OPN

FTB FTC

VCC

VRH

DO/IRQO

VSSA

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