ADC Reference Options

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.