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Is it possible to use the AD7147 for an approximation, I want to detect the hand at 10cm away from the button?
The proximity detection range for AD7147 is up to 2cm. Getting a detection distance of 10cm is not possible with the cap touch parts AD7147/8. We have other parts which offer more proximity distance range, AD7150/1 have 1 or 2 channels which can be dedicated to implement proximity detection with a range of up to 5cm. The range of the AD7150 is dependent on the actual sensor design/size/shape so it may be possible to extend the range with large sensor.