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The successive approximation, or SAR, method of measuring self-capacitance uses a pair of current sources to drive current into separate capacitors. The first is the reference capacitor, denoted as CREF; the second is CSENSOR, the sensor capacitor. The reference current source, which is denoted as IREF, is a fixed current used to drive the CREF capacitor, to provide a constant ramp voltage. The second current source, denoted ISENSOR, sources a variable current to the sensor capacitor. After each measurement cycle the SAR logic will change the value of ISENSOR, attempting to make the ramp rate the same as the reference capacitor.
PTM Published on: 2012-05-16
