Proximity Capacitive Touch Sensor Controller

Board-tiny (1)


The MPR121 is a second generation sensor controller. The MPR121 features increased internal intelligence plus a 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 auto-configuration. 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.

Additional information


1.71V to 3.6V operation
29µA typical run current at 16 ms sampling interval
3µA 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


PC Peripherals
MP3 Players
Remote Controls
Mobile Phones
Lighting Controls

Ordering Information

Part Number Package Temp Range Packaging Method Lead Free
MPR121QR2 QFN-20 -40°C to +85°C T&R Yes

In the News

Easily sense touch from up to 12 inputs using the MPR121!