Product description
The MPR121 is the second generation sensor controller following the
initial release of the MPR03x series of devices. The MPR121 features an
increased internal intelligence plus Freescale's second generation
capacitance detection engine. Some major enhancements include an
increased electrode count, a hardware configurable I2C address, an
expanded filtering system with debounce, and completely independent
electrodes with built-in autoconfiguration. The device also features a 13th
simulated electrode which represents the simultaneous charging of all the
electrodes connected together. When used with a touch panel or touch
screen array, the 13th simulated electrode allows a greater near proximity
detection distance and an increased sensing area.
Features
* 1.71V to 3.6V operation
* 29 µA typical run current at 16 ms sampling interval
* 3 µA in scan stop mode current
* 12 electrodes/capacitance sensing inputs in which 8 are
multifunctional for LED driving and GPIO
* Integrated independent autocalibration for each electrode input
* Autoconfiguration of charge current and charge time for each
electrode input
* Separate touch and release trip thresholds for each electrode,
providing hysteresis and electrode independence
* I2C interface, with IRQ Interrupt output to advise electrode status
changes
* 3 mm x 3 mm x 0.65 mm 20 lead QFN package
* -40°C to +85°C operating temperature range
initial release of the MPR03x series of devices. The MPR121 features an
increased internal intelligence plus Freescale's second generation
capacitance detection engine. Some major enhancements include an
increased electrode count, a hardware configurable I2C address, an
expanded filtering system with debounce, and completely independent
electrodes with built-in autoconfiguration. The device also features a 13th
simulated electrode which represents the simultaneous charging of all the
electrodes connected together. When used with a touch panel or touch
screen array, the 13th simulated electrode allows a greater near proximity
detection distance and an increased sensing area.
Features
* 1.71V to 3.6V operation
* 29 µA typical run current at 16 ms sampling interval
* 3 µA in scan stop mode current
* 12 electrodes/capacitance sensing inputs in which 8 are
multifunctional for LED driving and GPIO
* Integrated independent autocalibration for each electrode input
* Autoconfiguration of charge current and charge time for each
electrode input
* Separate touch and release trip thresholds for each electrode,
providing hysteresis and electrode independence
* I2C interface, with IRQ Interrupt output to advise electrode status
changes
* 3 mm x 3 mm x 0.65 mm 20 lead QFN package
* -40°C to +85°C operating temperature range
