MPR121QR2 - Proximity Capacitive Touch Sensor Controller
Table 1.
Pin Descriptions Pin No.
Pin Name Description 1 IRQ Open Collector Interrupt Output Pin, active low 2 SCL I2C Clock 3 SDA I2C Data 4 ADDR I2C Address Select Input Pin.
Connect the ADDR pin to the VSS, VDD, SDA or SCL line, the resulting I2C addresses are 0x5A, 0x5B, 0x5C and
MPR121QR2 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 autoc