Introduction
The AT42QT2160-MMU (QT2160) is designed for use with up to 16 keys and a slider (constructed from 2 keys up to 8 keys). There are three dedicated General Purpose Input/Outputs (GPIOs) which can be used as inputs for mechanical switches or as driven outputs. There are eight shared General Purpose Outputs (GPOs) (X0 – X7) which are driven outputs only. There is PWM control for each GPIO/GPOs.

The QT2160 device is a digital burst mode charge-transfer (QT™) sensor designed specifically for matrix layout touch controls; it includes all signal processing functions necessary to provide stable sensing under a wide variety of changing conditions. Only a few external parts are required for operation. The entire circuit can be built within a few square centimeters of single-sided PCB area. CEM-1 and FR1 punched, single-sided materials can be used for the lowest possible cost. The PCB rear can be mounted flush on the back of a glass or plastic panel using a conventional adhesive, such as 3M VHB two-sided adhesive acrylic film.