Interfacing Microchip AT42QT2120 to nrf52840-DK

[Vins]

Dear Nordic Community,

Help me in interfacing AT42QT2120 capacitive touch sensor to nrf52840 controller.

[awneil]

So what have you tried? Where are you stuck?

Remember that the AT42QT2120 - like any other external chip - neither knows nor cares what microcontroller you use.

The AT42QT2120  has an I2C interface; so all the AT42QT2120  requires is that you give it the correct sequence of Start Condition, Slave Address, etc, etc, as specified in its datasheet - and it will respond as specified in its datasheet.

https://www.microchip.com/wwwproducts/en/AT42qt2120

Similarly, the nRF52 I2C controller neither knows nor cares what slave(s) are connected to the bus:  all it does is generate Start Condition, Slave Address, etc and receives responses, ACK/NACK, etc - as specified in its documentation:

https://infocenter.nordicsemi.com/topic/struct_nrf52/struct/nrf52840.html

There are TWI examples in the SDK - start with the TWI Scanner Example to verify that you can correctly address the peripheral:

infocenter.nordicsemi.com/.../twi_scanner_example.html

[Vins]

Thank you for your response Mr.Awneil.