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I have the cy8ckit-059 , using the sequencing SAR (single ended), there's a compile error if the analog input is connected to an op-amp output internally. Is the only solution to bring the op-amp output to a pin and also the analog input of the SAR to a pin, then connect them with a wire externally? (I'm only using one-input for now, but I will be using 2 inputs later).
Why can't there be a direct connection, all internal, from op-amp output (internal) and SAR input ? I don't have this problem with the Delta-sigma A/D. Why?
That's all one question.
Another question- everytime I open the SAR part to configure, it changes the frequency. Originally I set it to 1 MHz, but it reverts to 999.992 kHz .
Thanks in advance
Jim
Solved! Go to Solution.
- Labels:
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ispn:39618:1:0
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l1:314:1:0
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PSoC5LP
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Hi,
For the ADC I ran into the same problem (see replies http://www.cypress.com/forum/psoc-creator-software/creator-error-signal-ah0degw-expected-connect-onl...). I had to go with ADC SAR+AMux instead of the Sequencing SAR, as I didn't like the external connection between "internal" OPAMP and sequencing SAR.
Regards,
Matija
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First page of Seq ADC datasheet says:
Note Only GPIOs can be connected to the channel inputs. The actual maximum number of input channels depends on the number of routable analog GPIOs available on a specific PSoC part and package.
Set the clock frequency a bit higher than 1 MHz, ADC will display 1000.020 kHz
Bob
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Hi,
For the ADC I ran into the same problem (see replies http://www.cypress.com/forum/psoc-creator-software/creator-error-signal-ah0degw-expected-connect-onl...). I had to go with ADC SAR+AMux instead of the Sequencing SAR, as I didn't like the external connection between "internal" OPAMP and sequencing SAR.
Regards,
Matija
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Yes, that's what I'm doing too. But still the question remains. Why does one allow for internal connections and the other doesn't? I can guess, like maybe they didn't see the point of it- if you have more than 4 inputs that you want buffered, this has to be done externally anyway. So they didn't bother to include this design feature. That's a guess...
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ok- I just read your link. That answers my question. Thanks a lot.