ADS7846

4 引线触摸屏控制器

The 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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SAME PINOUT AS ADS7843

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2.2V TO 5.25V OPERA ON

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INTERNAL 2.5V REFERENCE

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DIRECT BATTERY MEASUREMENT 0V to 6V

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ON-CHIP TEMPERATURE MEASUREMENT

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TOUCH-PRESSURE MEASUREMENT

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QSPI™/SPI™ 3-WIRE INTERFACE

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AUTO POWER-DOWN

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TSSOP-16, SSOP-16, QFN-16, AND VFBGA-48 PACKAGES

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APPLICATIONS

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PERSONAL DIGITAL ASSISTANTS

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PORTABLE INSTRUMENTS

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POINT-OF-SALES TERMINALS

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PAGERS

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TOUCH SCREEN MONITORS

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CELLULAR PHONES

US Patent No. 6246394

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