Description
The APT7843 Touch Screen Controller IC provides all the screen drive , A/D converter and control circuits to easily interface to 4 wire resistive touch screen. The IC continually monitors the screen waiting for a touch. When the screen touched , the IC performs A/D converter to determine the location of touch. Also , this device has 2 auxiliary input to A/D converter , allowing for the measurement of other inputs such as battery voltage.

Features
• 16 pin SSOP or TSSOP
• Operates with four wire touch screen
• 8-bit or 12 bit A/D converter
• Ratiometric Conversion eliminates screen calibration
• 2 auxiliary analog inputs
• 4 wire serial interface
• Full power down control

Applications
• PDAs
• Handheld computer
• Touch-screen kiosks