AD7879
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AD7879

Low Voltage Controller for Touch Screens

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Part Details
Part Models 9
1ku List Price Starting From $2.04
Features
  • 4-wire touch screen interface
  • 1.6 V to 3.6 V operation
  • Median and averaging filter to reduce noise
  • Automatic conversion sequencer and timer
  • User-programmable conversion parameters
  • Auxiliary analog input/battery monitor (0.5 V to 5 V)
  • 1 optional GPIO
  • Interrupt outputs (INT, PENIRQ)
  • Touch-pressure measurement
  • Wake-up on touch function
  • Shutdown mode: 6 μA maximum
  • 12-ball, 1.6 mm × 2 mm WLCSP
  • 16-lead, 4 mm × 4 mm LFCSP
Additional Details
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The AD7879 / AD7889 are 12-bit successive approximation analog-to-digital converters (SAR ADCs) with a synchronous serial interface and low on-resistance switches for driving 4-wire resistive touch screens. The AD7879/AD7889 work with a very low power supply—a single 1.6 V to 3.6 V supply—and feature a throughput rate of 105 kSPS. The devices include a shutdown mode that reduces current consumption to less than 6 μA.

To reduce the effects of noise from LCDs and other sources, the AD7879 / AD7889 contain a preprocessing block. The preprocessing function consists of a median filter and an averaging filter. The combination of these two filters provides a more robust solution, discarding the spurious noise in the signal and keeping only the data of interest. The size of both filters is programmable. Other user-programmable conversion controls include variable acquisition time and first conversion delay; up to 16 averages can be taken per conversion. The AD7879 / AD7889 can run in slave mode or standalone (master) mode, using an automatic conversion sequencer and timer.

The AD7879 / AD7889 have a programmable pin that can operate as an auxiliary input to the ADCs, as a battery monitor, or as a general-purpose input/output (GPIO). In addition, a programmable interrupt output can operate in three modes: as a general-purpose interrupt to signal when new data is available (DAV), as an interrupt to indicate when limits are exceeded (INT), or as a pen-down interrupt when the screen is touched (PENIRQ). The AD7879/AD7889 offer temperature measurement and touch pressure measurement.

The AD7879 is available in a 12-ball, 1.6 mm × 2 mm WLCSP and in a 16-lead, 4 mm × 4 mm LFCSP. The AD7889 is available in a backside coated version of the WLCSP. Both devices support an SPI interface (AD7879 / AD7889) or an I2C interface (AD7879-1 / AD7889-1).

APPLICATIONS

  • Personal digital assistants
  • Smart handheld devices
  • Touch screen monitors
  • Point-of-sale terminals
  • Medical devices
  • Cell phones
Part Models 9
1ku List Price Starting From $2.04

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
AD7879-1ACPZ-500R7
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AD7879-1ACPZ-RL
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AD7879-1WARUZ-RL
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AD7879-1WARUZ-RL7
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AD7879ACPZ-RL
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AD7879WACPZ-R5
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AD7879WACPZ-RL
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AD7879WARUZ-RL
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AD7879WARUZ-RL7
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Product Lifecycle

PCN

May 4, 2016

- 14_0178

Conversion of 3x3mm, 4x4mm and 5x5mm LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines

AD7879-1ACPZ-500R7

PRODUCTION

AD7879-1ACPZ-RL

PRODUCTION

AD7879ACPZ-RL

PRODUCTION

AD7879WACPZ-R5

PRODUCTION

AD7879WACPZ-RL

PRODUCTION

Oct 26, 2009

- 09_0202

Inclusion of Banding Tape for LFCSP REEL7 parts.

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

May 4, 2016

- 14_0178

arrow down

Conversion of 3x3mm, 4x4mm and 5x5mm LFCSP Package Outlines from Punch to Sawn and Transfer of Assembly Site to Amkor Philippines

AD7879-1ACPZ-500R7

PRODUCTION

AD7879-1ACPZ-RL

PRODUCTION

AD7879ACPZ-RL

PRODUCTION

AD7879WACPZ-R5

PRODUCTION

AD7879WACPZ-RL

PRODUCTION

Oct 26, 2009

- 09_0202

arrow down

Inclusion of Banding Tape for LFCSP REEL7 parts.

Evaluation Kit

Evaluation Kits 1

EVAL-AD7879

AD7879 & AD7879-1 Evaluation Boards

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EVAL-AD7879

AD7879 & AD7879-1 Evaluation Boards

AD7879 & AD7879-1 Evaluation Boards

Product Detail

This page contains evaluation board documentation and ordering information for evaluating the AD7879 and AD7879-1.

For use with AD7879 Evaluation Board. The software must be installed before the board is plugged in to the USB port on the PC. If the board is has been plugged in before the software is installed, you may need to update the driver. Do this by right clicking on My Computer, select Properties, then Device Manager, then Universal Serial Bus controllers. Right click on the USB device with the yellow "!" next to it and select Update Driver.

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