The LM8300/8500 is a 4-wire resistive touch screen controller. The controller samples and
drives the touch screen without the need of any external hardware. The built in 10-bit A/D provides
a maximum of 500 coordinate pairs per second (cpps). The data sampled from the touch screen is sent
out on the UART at a speed of 38400 bps.
The controller has a power-saving mode which causes the controller to self-power down
when no touch is detected on the touch screen for a specified amount of time. In the self-power
down mode, the current drawn is typically less than 2 µA. The device resumes normal operation when
a touch is detected on the touch screen or communication is detected on the UART. In addition to
the self-power down mode, the controller can be disabled by pulling the SHUTDOWN pin low. The
controller resumes normal operation when the SHUTDOWN pin is tristated or pulled high.
The controller has an internal non-volatile memory storage element to store configuration
data such as calibration points or controller configurations.
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