Configuring Reference to an ADC in PSoC1

Version 1
    Question: What are the different reference voltages that can be selected for an ADC measurement?  Is it possible to configure an ADC to take an external reference?

     

    Answer:

    The reference to an ADC (and other analog sections) may be selected using the "Ref Mux" parameter in the Global Resources.

    Following are the various reference settings available in a PSoC with full function Analog blocks.

    1.       (Vcc/2)+/- bandgap

    2.       (VCC/2) +/- Vcc/2

    3.       Bandgap +/- Bandgap

    4.       (1.6 Bandgap) +/- (1.6 Bandgap)

    5.       (2*Bandgap) +/- Bandgap

    6.       (2*Bandgap) +/- P2[6]

    7.       P2[4] +/- Bandgap

    8.       P2[4] +/- P2[6]

    Using options 7 and 8, an external voltage source may be used as AGND or Reference.

    Note: The Reference selected using the RefMux parameter is common to all the analog blocks.