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Keypad controller with eight GPIOs/LED drivers

Maxim Integrated Products has introduced the MAX7360, a key-switch controller featuring multiple key press/release detection on up to 64 keys, plus eight extra GPIOs/LED drivers and advanced ESD protection. Individual key codes for each press and release are stored in a FIFO register to enable monitoring of multiple key-switch events. The extra GPIOs/LED drivers can be used for keypad backlighting, LED indicators, or port expansion in remote areas of the application. The integrated ±8kV IEC Contact Discharge and ±15kV IEC Air-Gap Discharge ESD protection saves space and avoids the cost of external protection components. Providing a complete solution for keyboard control and backlighting, the controller is suitable for smartphones, cell phones, pocket PCs, and other portable consumer-electronics applications. The eight GPIOs/LED drivers feature constant current and individual port-intensity adjustment through a 256-step PWM control. Two of these I/Os can be configured to decode inputs from a rotary switch, for which separate debounce and interrupt conditions are used. The controller is fully specified over the -40°C to +85°C extended temperature range. It is available in a 5x5mm, 40pin TQFN and a 36-bump wafer-level package.