EVAL-AD7877EB(RevA) 查看數據表（PDF） - Analog Devices
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EVAL-AD7877EB Datasheet PDF : 44 Pages
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AD7877
TABLE OF CONTENTS
Specifications..................................................................................... 3
Timing Specifications....................................................................... 5
Absolute Maximum Ratings............................................................ 6
ESD Caution.................................................................................. 6
Pin Configuration and Function Descriptions............................. 7
Terminology ...................................................................................... 9
Typical Performance Characteristics ........................................... 10
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
REVISION HISTORY
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
Sequencer Registers ................................................................... 22
Interrupts..................................................................................... 24
Syncronizing 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
Register Maps.................................................................................. 33
Detailed Register Descriptions ..................................................... 35
GPIO Registers ........................................................................... 41
Outline Dimensions ....................................................................... 43
Ordering Guide .......................................................................... 43
Rev. A | Page 2 of 44
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