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AD7879/AD7889

Data Sheet

Rev. D | Page 2 of 40

TABLE OF CONTENTS

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

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

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

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

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

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

SPI Timing Specifications (AD7879/AD7889) ........................ 4

I2C Timing Specifications (AD7879-1/AD7889-1) ................. 5

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

Thermal Resistance ...................................................................... 6

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

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

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

Terminology .................................................................................... 12

Theory of Operation ...................................................................... 13

Touch Screen Principles ............................................................ 13

Measuring Touch Screen Inputs............................................... 14

Touch Pressure Measurement................................................... 15

Temperature Measurement ....................................................... 15

Median and Averaging Filters....................................................... 17

AUX/VBAT/GPIO Pin................................................................... 18

Auxiliary Input ........................................................................... 18

Battery Input ............................................................................... 18

Limit Comparison...................................................................... 18

GPIO ............................................................................................ 18

Conversion Timing ........................................................................ 20

Detailed Register Descriptions ..................................................... 22

Control Registers............................................................................ 26

Control Register 1 ...................................................................... 26

Control Register 2 ...................................................................... 28

Control Register 3 ...................................................................... 30

Interrupts..................................................................................... 31

Synchronizing the AD7879/AD7889 to the Host CPU......... 32

Serial Interface ................................................................................ 33

SPI Interface................................................................................ 33

I2C-Compatible Interface .......................................................... 35

Grounding and Layout .................................................................. 38

Lead Frame Chip Scale Packages ............................................. 38

WLCSP Assembly Considerations........................................... 38

Outline Dimensions....................................................................... 39

Ordering Guide .......................................................................... 40

REVISION HISTORY

8/2016—Rev. C to Rev. D

Changed CP-16-10 to CP-16-20 .................................. Throughout

Changes to General Description Section ...................................... 1

Changes to Figure 7, Figure 8, and Table 7 ................................... 8

Moved Figure 34; Renumbered Sequentially.............................. 30

Updated Outline Dimensions....................................................... 39

Changes to Ordering Guide .......................................................... 39

11/2010—Rev. B to Rev. C

Changes to Table 2............................................................................ 3

Added Conversion Timing Section.............................................. 20

Added Figure 34.............................................................................. 29

1/2010—Rev. A to Rev. B

Updated Outline Dimensions....................................................... 37

Changes to Ordering Guide .......................................................... 38

3/2009—Rev. 0 to Rev. A

Added AD7889 and Backside-Coated WLCSP..............Universal

Change to Battery Monitor, Input Voltage Range Parameter..... 3

Changes to Table 4............................................................................ 6

Added Thermal Resistance Section and Table 5; Renumbered

Sequentially ....................................................................................... 6

Changes to Pin Configurations and Function Descriptions Section..7

Added Table 7 ....................................................................................8

Changes to First Method Section................................................. 15

Changes to Median and Averaging Filters Section .................... 17

Changes to GPIO Interrupt Enable (Bit 12, Control Register 3,

Address 0x03) Section ................................................................... 19

Changes to Table 13 ....................................................................... 22

Changes to ADC Channel (Control Register 1, Bits[14:12])

Section.............................................................................................. 26

Changes to Power Management (Control Register 2,

Bits[15:14]) Section........................................................................ 27

Changes to DAV—Data Available Interrupt Section................. 29

Changes to INT—Out-of-Limit Interrupt Section .................... 29

Changes to Writing Data Section................................................. 31

Changes to Reading Data Section and Figure 40....................... 32

Changes to Figure 41...................................................................... 33

Changes to Writing Data over the I2C Bus Section.................... 34

Changes to Figure 44...................................................................... 35

Updated Outline Dimensions....................................................... 37

Changes to Ordering Guide.......................................................... 38

10/2008—Revision 0: Initial Version

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