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AD7877

Data Sheet

TABLE OF CONTENTS

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

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

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

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

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

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

Timing Specifications .................................................................. 5

Timing Diagrams.......................................................................... 5

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Pin Configurations and Function Descriptions ........................... 7

Typical Performance Characteristics ............................................. 9

Terminology .................................................................................... 13

Circuit Information........................................................................ 14

Touch Screen Principles ............................................................ 14

Measuring Touch Screen Inputs............................................... 15

Touch-Pressure Measurement .................................................. 16

STOPACQ Pin ............................................................................ 16

Temperature Measurement ....................................................... 17

Battery Measurement................................................................. 18

Auxiliary Inputs.......................................................................... 19

Limit Comparison ...................................................................... 19

Control Registers............................................................................ 20

Control Register 1 ...................................................................... 20

Control Register 2 ...................................................................... 21

Sequencer Registers ................................................................... 22

Interrupts..................................................................................... 24

Synchronizing the AD7877 to the Host CPU......................... 25

8-Bit DAC ........................................................................................ 26

Serial Interface ................................................................................ 28

Writing Data ............................................................................... 28

Write Timing............................................................................... 29

Reading Data............................................................................... 29

VDRIVE Pin..................................................................................... 29

General-Purpose I/O Pins............................................................. 30

GPIO Configuration .................................................................. 30

Grounding and Layout .................................................................. 32

PCB Design Guidelines for Chip Scale Packages................... 32

Detailed Register Descriptions ..................................................... 35

GPIO Registers ........................................................................... 42

Outline Dimensions....................................................................... 44

Ordering Guide .......................................................................... 45

Automotive Products................................................................. 45

REVISION HISTORY

12/14—Rev. D to Rev. E

Added Figure 50; Renumbered Sequentially .............................. 44

Updated Outline Dimensions....................................................... 44

Changes to Ordering Guide .......................................................... 45

12/11—Rev. C to Rev. D

Change to Features Section ............................................................. 1

Updated Outline Dimensions....................................................... 44

Changes to Ordering Guide .......................................................... 44

Added Automotive Products Section........................................... 44

9/09—Rev. B to Rev. C

Changes to Offset Error and Gain Error Parameters .................. 3

Added VBAT to GND Parameter ...................................................... 6

Changes to Pin 23 Description ....................................................... 7

Changes to Power Management (Control Register 2,

Bits[7:6]) Section ............................................................................ 22

Changes to Bit 7 Description (Table 17)...................................... 36

Updated Outline Dimensions....................................................... 44

Changes Ordering Guide............................................................... 44

6/06—Rev. A to Rev. B

Added Wafer Level Chip Scale Package ..........................Universal

Changes to Table 3.............................................................................6

Changes to Figure 21...................................................................... 11

Change to Figure 25 ....................................................................... 12

Changes to Figure 38 and Figure 39 ............................................ 23

Change to Figure 40 ....................................................................... 24

Changes to Data Available Output (DAV) Section.................... 24

Updated Outline Dimensions....................................................... 42

Changes to Ordering Guide.......................................................... 42

11/04—Rev. 0 to Rev. A

Changes to Absolute Maximum Ratings .......................................6

Changes to Figure 4...........................................................................7

Changes to Table 4.............................................................................7

Changes to Grounding and Layout section ................................ 32

Changes to Figure 42...................................................................... 32

Changes to Ordering Guide.......................................................... 43

7/04—Revision 0: Initial Version

Rev. E | Page 2 of 45

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