●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.
● Supports 4 Wire Resistive Touch Panels
● Low Power Standby Current Typically Less Than 2 µA at 5.5V
● Maximum Speed of 500 Coordinate Pairs per Second
● Automatic Wake Up and Return to Standby
● 10 bit A/D
● On-chip Touch Screen Current Drivers - No External Driver Required
● UART Interface
● Controller Configurations are Stored in the Internal Non-volatile Storage Element
● Touch Pressure can be Measured
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