NRF52 Capacitive Button Interrupt and Power Consumption


I am working an a product based on the NRF52832 and I need to trigger an interrupt when a capacitive button is pressed / proximity detected  (BLE is peripheral and it is advertising).

I need the extra current  used by the capacitive touch controller to be in the uA range.

What is the added current consumption to for an application like this? Or is it better to consider an external touch controller (although it is definitely not cost effective).

Thanks and Regards,