ADC Reference Options

Version 1
    Question: How to I select the Reference for my ADC in PSoC Designer?

     

    Answer:

    You have the choice of selecting a reference from the following options:

    •   VCC / 2 +/- BandGap
    •   VCC / 2 +/- VCC / 2
    •   BandGap +/- BandGap
    •   1.6 * BandGap +/- 1.6 * BandGap
    •   2 * BandGap +/- BandGap
    •   2 * BandGap +/- P2[6]
    •   P2[4] +/- BandGap
    •   P2[4] +/- P2[6]

    You can select these in Global Resources section in PSoC Designer and the options vary from device to device. The range of the ADCINC is set at ±VRef. For fixed scale, VRef is set to VBandgap, or 1.6 VBandgap. For adjustable scale, VRef is set to Port 2[6]. For supply ratio metric scale, VRef is set to VDD/2.