Button events may be reported by using two methods. The first method is to monitor the OUTn pins (n = 0, 1, 2, or 3), which are push-pull outputs and can be used as interrupts to a microcontroller. The polarities of these pins are programmable through Register OPOL_DPOL (Address 0x1C). Any button press or error condition is also reported by the open-drain pin, INTB. The INTB pin polarity is configurable through Register INTPOL (Address 0x11). Any assertion of INTB is cleared upon reading Register STATUS (Address 0x00). Each push-pull output must be assigned to a dedicated general-purpose input pin on the microcontroller to avoid potential current fights.

The second method is through the I²C interface. The Register OUT (Address 0x01) contains the fields OUT0, OUT1, OUT2, and OUT3, which indicate when a button press has been detected. For more advanced button press measurements, the output DATAn registers (n = 0, 1, 2, or 3, Register DATA0_LSB - Address 0x02), which are 12-bit two’s complements, can be retrieved for all active buttons, and processed on a microcontroller. A valid button push is represented by a positive value. The polarity is configurable in Register OPOL_DPOL (Address 0x1C). The DATAn values can be used to implement multilevel buttons, where the data value is correlated to the amount of force applied to the button.