AD7879ACPZ-RL Analog Devices Inc, AD7879ACPZ-RL Datasheet - Page 2

• Manufacturer Part Number: AD7879ACPZ-RL
• Description: IC ADC 12BIT CTLR TOUCH 16LFCSP
• Manufacturer: Analog Devices Inc
• Type: Touch Screen Controller: 4-Wire Resistiver

Specifications of AD7879ACPZ-RL

• Resolution (bits): 12 b
• Data Interface: I²C
• Package / Case: 16-LFCSP
• Mounting Type: Surface Mount
• Voltage - Supply: 1.6 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Voltage Supply Source: Single Supply
• Sampling Rate (per Second): 105k
• Sampling Rate: 105kSPS
• Supply Voltage Range - Analog: 1.6V To 3.6V
• Supply Current: 480µA
• Digital Ic Case Style: CSP
• No. Of Pins: 16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD7879
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 6
Pin Configuration and Function Descriptions ............................. 7
Typical Performance Characteristics ............................................. 8
Terminology .................................................................................... 11
Theory of Operation ...................................................................... 12
Median and Averaging Filters ....................................................... 16
AUX/VBAT/GPIO Pin ................................................................... 17
REVISION HISTORY
10/08—Revision 0: Initial Version
SPI Timing Specifications (AD7879) ......................................... 4
I
ESD Caution .................................................................................. 6
Touch Screen Principles ............................................................ 12
Measuring Touch Screen Inputs ............................................... 13
Touch-Pressure Measurement .................................................. 14
Temperature Measurement ....................................................... 14
2
C Timing Specifications (AD7879-1) ..................................... 5
Rev. 0 | Page 2 of 36
Register Map ................................................................................... 19
Detailed Register Descriptions ..................................................... 20
Control Registers ............................................................................ 24
Serial Interface ................................................................................ 30
Grounding and Layout .................................................................. 35
Outline Dimensions ....................................................................... 36
Auxiliary Input ........................................................................... 17
Battery Input ............................................................................... 17
Limit Comparison ...................................................................... 17
GPIO ............................................................................................ 17
Control Register 1 ...................................................................... 24
Control Register 2 ...................................................................... 26
Control Register 3 ...................................................................... 27
Interrupts ..................................................................................... 28
Synchronizing the AD7879 to the Host CPU ......................... 29
SPI Interface ................................................................................ 30
I
Chip Scale Packages ................................................................... 35
WLCSP Assembly Considerations ........................................... 35
Ordering Guide .......................................................................... 36
2
C-Compatible Interface .......................................................... 32