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AD7889ACBZ-RL Datasheet(PDF) 2 Page - Analog Devices |
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2 / 40 page 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 Register Map ................................................................................... 21 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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