AD7150 detection range 10cm for proximity

Hi Patrick,

Your use case is application specific. 10cm distance is a bit far off and the capacitive range will be reduced. You have to add extra circuitry to detect the proximity at such distances. 

Please refer to the app note. AN-1528 (Rev. A) (analog.com) AN-1585 (Rev. A) (analog.com) AN-1301 (Rev. 0) (analog.com)

 Hello 

     Customer would like to detect finger close to touch panel that 10cm detection distance. If close to touch panel under 10cm and touch pad will light on. Then close to 2cm distance, finger can touch the pad on panel.  The touch pad is 8 on panel.

        They would like use AD7150 to detect 10cm then light on panel. If keep close, they will use AD7142 to detect touch pad on panel. Is this feasible？ If yes, how to design touch pad layout and shape of AD7150 and AD7142? Thank you. 

BR

Patrick

 Hello 

     Customer would like to detect finger close to touch panel that 10cm detection distance. If close to touch panel under 10cm and touch pad will light on. Then close to 2cm distance, finger can touch the pad on panel.  The touch pad is 8 on panel.

        They would like use AD7150 to detect 10cm then light on panel. If keep close, they will use AD7142 to detect touch pad on panel. Is this feasible？ If yes, how to design touch pad layout and shape of AD7150 and AD7142? Thank you. 

BR

Patrick

It is doable. All you need is to find a way to disable one sensor interface while switching to next, as you cannot share the sensor to two interfaces for excitation at the same time.