Configuring Reference to an ADC in PSoC1
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Feb 26, 2011
08:09 AM
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Feb 26, 2011
08:09 AM
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.
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