The AR1021-I/SS is an integrated digital touch controller chip manufactured by Microchip and is part of their AR10 series of touch controller families. It is an I²C and SPI serial interface device, which means it is optimized for portable applications that need low power consumption, such as those found in smartphones, tablets, and laptop computers. The chip is capable of supporting up to 128 independently programmable, active touch sensors. It also has a range of self-calibration and drift compensation algorithms, allowing for consistent performance over time and variations in temperature.