Interfacing Microchip AT42QT2120 to nrf52840-DK

Question

Dear Nordic Community, 
 Help me in interfacing AT42QT2120 capacitive touch sensor to nrf52840 controller.

awneil · Accepted Answer

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

Interfacing Microchip AT42QT2120 to nrf52840-DK

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