AD7879 Ver la hoja de datos (PDF) - Analog Devices
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AD7879 Datasheet PDF : 40 Pages
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AD7879/AD7889
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
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
Data Sheet
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
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
Rev. D | Page 2 of 40
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