MK715 Touch Screen Controller General Description 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.
The IC continually monitors the screen waiting for a touch.
In this mode, the supply current is typically 4µA.
When the screen is touched, the IC performs analog to digital conversions to determine the location of the touch, stores the X and Y locations in the registers, and issues an interrupt.
This process is repeated up to 303 times per second until no further screen touches are de...

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