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ADS7846

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4-wire Touch Screen Controller

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4-wire Touch Screen Controller

ADS7846

ACTIVE
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Product details

Parameters

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Package | Pins | Size

SSOP (DBQ) 16 29 mm² 4.9 x 6 TSSOP (PW) 16 22 mm² 4.4 x 5 VQFN (RGV) 16 16 mm² 4 x 4 open-in-new Find other Touch screen controllers

Features

  • SAME PINOUT AS ADS7843
  • 2.2V TO 5.25V OPERATION
  • INTERNAL 2.5V REFERENCE
  • DIRECT BATTERY MEASUREMENT (0V to 6V)
  • ON-CHIP TEMPERATURE MEASUREMENT
  • TOUCH-PRESSURE MEASUREMENT
  • QSPI™/SPI™ 3-WIRE INTERFACE
  • AUTO POWER-DOWN
  • TSSOP-16, SSOP-16, QFN-16, AND VFBGA-48 PACKAGES
  • APPLICATIONS
    • PERSONAL DIGITAL ASSISTANTS
    • PORTABLE INSTRUMENTS
    • POINT-OF-SALES TERMINALS
    • PAGERS
    • TOUCH SCREEN MONITORS
    • CELLULAR PHONES

US Patent No. 6246394
QSPI and SPI are registered trademarks of Motorola.
All trademarks are the property of their respective owners.

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Description

The ADS7846 is a next-generation version to the industry standard ADS7843 4-wire touch screen controller. The ADS7846 is 100% pin-compatible with the existing ADS7843, and drops into the same socket. This allows for easy upgrade of current applications to the new version. Only software changes are required to take advantage of the added features of direct battery measurement, temperature measurement, and touch-pressure measurement. The ADS7846 also has an on-chip 2.5V reference that can be used for the auxiliary input, battery monitor, and temperature measurement modes. The reference can also be powered down when not used to conserve power. The internal reference operates down to 2.7V supply voltage while monitoring the battery voltage from 0V to 6V.

The low-power consumption of < 0.75mW typ at 2.7V (reference off), high speed (up to 125kHz clock rate), and on-chip drivers make the ADS7846 an ideal choice for battery-operated systems such as personal digital assistants (PDAs) with resistive touch screens, pagers, cellular phones, and other portable equipment. The ADS7846 is available in the small TSSOP-16, SSOP-16, QFN-16, and VFBGA-48 packages and is specified over the –40°C to +85°C temperature range.

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Technical documentation

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Type Title Date
* Data sheet Touch-Screen Controller datasheet (Rev. H) Jan. 27, 2005
Application note PCB Layout Guideline for TI Resistive TSC Devices Oct. 04, 2012
Application note Using a touch-screen controller’s auxiliary inputs Oct. 12, 2007
Application note Reducing Analog Input Noise in Touch Screen Systems (Rev. A) Sep. 15, 2007
Application note Calibration in touch-screen systems Aug. 10, 2007
Application note Set Up and Use TSC Timings Jun. 07, 2007
Application note Operation Schemes of Touch Screen Controllers May 21, 2007
Application note Apply TI TSC for Various and Multiple Functions Dec. 11, 2006
Application note Using the ADS7846 Touch Screen Ctrl. with the Intel SA-1110 StrongArm Processor Sep. 19, 2001
User guide DEM-ADS7846 Touchscreen Controller Evaluation Fixture May 02, 2001
User guide DEM-CIB Evaluation Fixture Computer Interface Board Feb. 13, 2001
Application note Evaluating the ADS7846E: Using the DEM-ADS7843E/45E Evaluation Fixture Sep. 27, 2000
Application note Touch Screen Controller Tips Sep. 27, 2000

Design & development

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CAD/CAE symbols

Package Pins Download
SSOP (DBQ) 16 View options
TSSOP (PW) 16 View options
VQFN (RGV) 16 View options

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