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AD7889:  Low Voltage Controller for Touch Screens

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 throughput rates of 105 kSPS. The devices include a shutdown mode that reduces current ...More

AD7889:  Low Voltage Controller for Touch Screens

Product Description

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 throughput rates 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 prepro-cessing 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 ADC, as a battery monitor, or as a 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 temp-erature 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 parts support an SPI interface (AD7879/AD7889) or an I2C® interface (AD7879-1/AD7889-1).

Applications

  • Personal digital assistants
  • Smart hand-held devices
  • Touch screen monitors
  • Point-of-sales terminals
  • Medical devices
  • Cell phones

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TECHNICAL DOCUMENTATION

  • 4-wire touch screen interface
  • 1.6V to 3.6V operation
  • Median and averaging filter to reduce noise
  • Automatic conversion sequencer and timer
  • WLCSP package with backside coating
  • User-programmable conversion parameters
  • Auxiliary analog input /Battery Monitor (0.5 V to 5 V)
  • 1 Optional GPIO
  • See data sheet for additional features.
  • Resolution (Bits): 12bit
  • T-Put Rate: 105kSPS
  • # Chan: 6
  • Supply V: Single(+1.6 to +3.6V)
  • Pwr Diss: 2.3mW
  • Sleep Pwr Diss: 1.8µW
  • Ain Range: Uni Vdd
  • Ref Int/Ext: Ext
  • Product Description: Low Voltage Controller for Touch Screens

Functional Block Diagram for AD7889

类似产品

arrow View Full Interactive Product Selection Table
Part# Resolution (Bits) T-Put Rate # Chan Supply V Pwr Diss Sleep Pwr Diss Ain Range Ref Int/Ext Product Description Price* (1000-4999)
AD7843 12 125kSPS 4 Single(+3), Single(+3.3) 1.4mW 3.6µW Uni (Vref) Ext 4-Wire Resistive Touch Screen Controller w/ 2 Aux Inputs & 8-Bit SPI Interface. Uses Ext Reference. $1.16
AD7873 12 125kSPS 6 Single(+3), Single(+3.3) 1.4mW 3.6µW Uni (Vref), Uni 2.5V Int/Ext 4-Wire Resistive Touch Screen Controller w/ Temp Sensor, 2.5V Ref, and Aux & Battery Inputs $1.95
AD7877 12 125kSPS 9 Single(+3), Single(+3.3) 3.2mW 3.6µW Uni (Vref), Uni 2.5V Int/Ext 4-Wire Resistive Touch Screen Controller w/ Noise Reduction, DAC, Conversion Controls, & GPIO $2.15
AD7879 12 105kSPS 6 Single(+2.7), Single(+3), Single(+3.3) 2.3mW 22µW Uni Vdd Ext Low Cost Controller for Touch Screens $1.69
AD7889 12 105kSPS 6 Single(+1.6 to +3.6V) 2.3mW 1.8µW Uni Vdd Ext Low Voltage Controller for Touch Screens $1.69
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* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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