I have been assigned a project where I have to use interface an MPR121 capacitive touch sensing controller with a microcontroller. Aside from the touch detection, one of the requests for the project was capacitance measurement from the touch pins, and to display it's change using graphs.

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I know that I can get the capacity of the electrode from 2nd filtered data registers that contains 10 bits of data, 2 msb and 8 lsb.

My question is do all these 10 bits represent the capacity, or are they used for some other info rather then only capacity? Thank you.

  • \$\begingroup\$ What does the datasheet say? \$\endgroup\$ – Hearth Mar 16 at 14:14
  • \$\begingroup\$ Datasheet says "The 2nd level filter result is 10bit and stored in the output data registers 0x04~0x1D as the immediate capacitance of each sensing input". \$\endgroup\$ – Çlirim Murati Mar 17 at 13:32

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