Proximity capacitive touch sensor controller

22 August 2007 Electronics Technology

Freescale's MPR081 is a proximity capacitive touch sensor controller designed for rotary interface applications with up to 16 rotary positions. It uses a digital output I²C interface to communicate. The voltage operation range is 1,8 to 3,6 V, which is ideal for consumer electronics. The device has a sound driver that provides audible feedback to simulate mechanical key clicks. Average supply current, when all touch pads are being monitored, is 150 μA, and 1 μA in standby mode. The device also features proprietary false touch rejection technology and provides ongoing pad analysis and detection which is not reset by EMI events. It is available in 16-pin QFN and TSSOP packages, and is specified over the temperature range -40°C to +85°C.

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