MK715 - Touch Screen Controller

The MK715 Touch Screen Controller IC provides all the screen drive, Analog to Digital converter (ADC) and control circuits to easily interface to 4-wire analog resistive touch screens.

It also includes a general purpose A to D converter and a clock synthesizer.

• • • • • • • • • • • • • • • • • • • Tiny 20 pin SSOP (150 mil body) 4 microamp standby current Less than 3mA active current at 3.3V, including screen drive Touch pressure can be measured One or two general purpose A to D inputs On-chip voltage reference 32.768kHz crystal/clock input MHz clock outputs available Operates with four wire touch screens Ratiometric conversion eliminates screen calibration Automatic wake up upon screen touch Programmable conversion rate to a maximum of 303 points per s.