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The MPR121 is the second generation sensor controller after the
initial release of the MPR03x series devices. The MPR121 will
feature increased internal intelligence in addition to Freescale’s
second generation capacitance detection engine. Some of the major
additions include an increased electrode count, a hardware
configurable I2C address, an expanded filtering system with
debounce, and completely independent electrodes with autoconfiguration built in. The device also features a 13th simulated electrode that represents the simultaneous charging of all the electrodes connected together to allow for increased proximity detection in a touch panel or touch screen array.
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Features
- 1.71 V to 3.6 V operation
- 29 μA supply current with 12 electrodes being monitored with 64 ms response time and IRQ enabled
- 3 μA shutdown current
- 12 electrodes
- Continuous independent auto-calibration for each electrode input
- Separate touch and release trip thresholds for each electrode, providing hysteresis and electrode independence
- I2C interface, with optional IRQ output to advise electrode status changes
- 3 mm x 3 mm x 0.65 mm 20 lead QFN package
- LED driver functionality with maximum of 8 LEDs
- -40°C to +85°C operating temperature range
- This product is included in Freescale’s product longevity program, with assured supply for a minimum of 10 years after launch
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