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PSoC™ 5, 3 & 1 Forum Discussions

979A35J
Level 1
Level 1
First question asked Welcome!

I have been working to prototype a control system using a PSoC 4000S development board. In theory the device has 1 ADC block and two DAC blocks. However, when I try to instantiate two IDAC7 blocks and one ADC block I get an error stating the "maximum number of DACs exceeded  (max=2, needed=3)". I can delete the ADC block and the project will build, or I can delete one of the DAC blocks and the project will build. Does this mean the ADC block requires one of the DAC blocks to function, or is this a bug?

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1 Solution
MotooTanaka
Level 9
Level 9
First comment on KBA 1000 replies posted 750 replies posted

Hi,

As it seems to be an interesting symptom, I checked with the Architecture Technical Reference Manual of PSoC 4000S.

The IDAC blocks was shown as

002-IDAC_Connection.JPG

Abd there the ADC function was shown like below.

Note:  IDACB is used.

001-ADC_Block.JPG

So I think that as you imagined, one IDAC (IADCB) is used in ADC,

so you can not use both ADC and two IDACs in the same time.

moto

 

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MotooTanaka
Level 9
Level 9
First comment on KBA 1000 replies posted 750 replies posted

Hi,

As it seems to be an interesting symptom, I checked with the Architecture Technical Reference Manual of PSoC 4000S.

The IDAC blocks was shown as

002-IDAC_Connection.JPG

Abd there the ADC function was shown like below.

Note:  IDACB is used.

001-ADC_Block.JPG

So I think that as you imagined, one IDAC (IADCB) is used in ADC,

so you can not use both ADC and two IDACs in the same time.

moto

 

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