AD7150

Rev. 0 | Page 2 of 28

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Functional Block Diagram .............................................................. 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Timing Specifications .................................................................. 4

Absolute Maximum Ratings............................................................ 5

ESD Caution.................................................................................. 5

Pin Configuration and Function Descriptions............................. 6

Typical Performance Characteristics ............................................. 7

Architecture and Main Features ................................................... 10

Capacitance-to-Digital Converter............................................ 10

CAPDAC ..................................................................................... 10

Comparator and Threshold Modes.......................................... 11

Adaptive Threshold.................................................................... 11

Data Average ............................................................................... 11

Sensitivity..................................................................................... 12

Hysteresis..................................................................................... 12

Timeout........................................................................................ 12

AutoCAPDAC Adjustment ....................................................... 13

Power-Down Timer ................................................................... 13

Power Supply Monitor ............................................................... 13

Register Descriptions ..................................................................... 14

Status Register ............................................................................. 15

Data Registers ............................................................................. 16

Average Registers........................................................................ 16

Fixed Threshold Registers ......................................................... 16

Sensitivity Registers ................................................................... 16

Timeout Registers....................................................................... 17

Setup Registers............................................................................ 18

Configuration Register .............................................................. 19

Power-Down Timer Register .................................................... 20

CAPDAC Registers .................................................................... 20

Serial Number Register.............................................................. 20

Chip ID Register......................................................................... 20

Serial Interface ................................................................................ 21

Read Operation........................................................................... 21

Write Operation.......................................................................... 21

AD7150 Reset ............................................................................. 22

General Call ................................................................................ 22

Hardware Design Considerations ................................................ 23

Overview ..................................................................................... 23

Parasitic Capacitance to Ground.............................................. 23

Parasitic Resistance to Ground................................................. 23

Parasitic Parallel Resistance ...................................................... 23

Parasitic Serial Resistance ......................................................... 24

Input Overvoltage Protection ................................................... 24

Input EMC Protection ............................................................... 24

Power Supply Decoupling and Filtering.................................. 24

Application Examples ................................................................ 25

Outline Dimensions ....................................................................... 26

Ordering Guide .......................................................................... 26

REVISION HISTORY

11/07—Revision 0: Initial Version