AF2046

功能特点

AF2046 Low Voltage I/O Touch Screen Controller

AF2046 低电压I/O触摸屏控制器

General Description:

The AF2046 is a next-generation version to the ADS7846 4-wire touch screen controller which supports a low-voltage I/O interface from 1.5V to 5.25V. The AF2046 is 100% pincompatible with the existing ADS7846, and will drop into the same socket. This allows for easy upgrade of current applications to the new version. The AF2046 also has an onchip 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 sample rate), and onchip drivers make the AF2046 an ideal choice for batteryoperated systems such as personal digital assistants (PDAs) with resistive touch screens, pagers, cellular phones, and other portable equipment. The AF2046 is available in TSSOP-16, QFN-16, and VFBGA-48 packages and is specified over the –40°C to +85°C temperature range.

Features:

■ SAME PINOUT AS ADS7846

■ 2.2V TO 5.25V OPERATION

■ 1.5V TO 5.25V DIGITAL I/O

■ INTERNAL 2.5V REFERENCE

■ DIRECT BATTERY MEASUREMENT (0V to 6V)

■ ON-CHIP TEMPERATURE MEASUREMENT

■ TOUCH-PRESSURE MEASUREMENT

■ QSPITM AND SPITM 3-WIRE INTERFACE

■ AUTO POWER-DOWN

■ AVAILABLE IN TSSOP-16, QFN-16, AND

■ VFBGA-48 PACKAGES

Applications:

■ PERSONAL DIGITAL ASSISTANTS

■ PORTABLE INSTRUMENTS

■ POINT-OF-SALE TERMINALS PAGERS

■ TOUCH SCREEN MONITORS

■ CELLULAR PHONES