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

QSPITM/SPITM 3-WIRE INTERFACE

AUTO POWER-DOWN

TSSOP-16, SSOP-16, QFN-16,

AND VFBGA-48 PACKAGES

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 onchip

drivers make the ADS7846 an ideal choice for batteryoperated

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.

APPLICATIONS

PERSONAL DIGITAL ASSISTANTS

PORTABLE INSTRUMENTS

POINT-OF-SALE TERMINALS

PAGERS

TOUCH SCREEN MONITORS

CELLULAR PHONES