EVAL-AD7877EBZ Analog Devices Inc, EVAL-AD7877EBZ Datasheet - Page 2

• Manufacturer Part Number: EVAL-AD7877EBZ
• Description: BOARD EVALUATION FOR AD7877
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7877EBZ

• Main Purpose: Interface, Touch Screen Controller
• Embedded: No
• Utilized Ic / Part: AD7877
• Primary Attributes: 4-Wire Resistive Touch Screen Controller, SPI Interface, On-Chip: Temp Sensor, Voltage Reference, 8-Bit DAC
• Secondary Attributes: USB GUI, LCD Noise Reduction Feature, 2.7 ~ 5.25 V, Wake Up on Touch Feature
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD7877
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
Pin Configurations and Function Descriptions ........................... 7
Typical Performance Characteristics ............................................. 9
Terminology .................................................................................... 13
Circuit Information ........................................................................ 14
REVISION HISTORY
6/06—Changed from 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
Timing Specifications .................................................................. 5
Timing Diagrams.......................................................................... 5
ESD Caution.................................................................................. 6
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
Rev. B | Page 2 of 44
Control Registers ............................................................................ 20
8-Bit DAC ........................................................................................ 26
Serial Interface ................................................................................ 28
General-Purpose I/O Pins............................................................. 30
Grounding and Layout .................................................................. 32
Register Maps.................................................................................. 33
Detailed Register Descriptions ..................................................... 35
Outline Dimensions ....................................................................... 42
11/04—Changed from 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
Control Register 1 ...................................................................... 20
Control Register 2 ...................................................................... 21
Sequencer Registers ................................................................... 22
Interrupts..................................................................................... 24
Syncronizing the AD7877 to the Host CPU ........................... 25
Writing Data ............................................................................... 28
Write Timing............................................................................... 29
Reading Data............................................................................... 29
V
GPIO Configuration .................................................................. 30
PCB Design Guidelines for Chip Scale Packages................... 32
GPIO Registers ........................................................................... 40
Ordering Guide .......................................................................... 42
DRIVE
Pin..................................................................................... 29