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AD7877ACP-REEL7 Datasheet(PDF) 2 Page - Analog Devices |
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AD7877ACP-REEL7 Datasheet(HTML) 2 Page - Analog Devices |
2 / 44 page AD7877 Rev. A | Page 2 of 44 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 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 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 |
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