6 Replies Latest reply on Sep 21, 2020 10:10 AM by RoRo_4659551

    CY8C54LP - Delta Sigma ADC component is missing

    RoRo_4659551

      Hi,

       

      I dont know why, but the Delta Sigma ADC [ADC_DelSig] component is missing in my PSoC Creator when I am trying to design a project for my PSoC Chip [CY8C5467AXI-LP108], yet it is shown for my other PSoC Chip [CY8C5868AXI-LP035].

       

      I dont understand why it is happening since it is written in the datasheet that the CY8C5467AXI-LP108 PSoC Chip also has delta sigma adc in it.

       

      Please your support according to these information:

      PSoC Chip - CY8C5467AXI-LP108.

      PSoC DVK - CY8CKIT-001.

      PSoC Creator - Ver 4.3

       

      Thanks,

      Roy Roif.

        • 1. Re: CY8C54LP - Delta Sigma ADC component is missing
          LePo_1062026

          Roy,

           

          Sorry.  The part you are using (CY8C5467AXI-LP108) only has 1 SAR ADC.  No DeltaSig.

           

          Cypress has many PSoC5LP part variations.   The datasheet tries to cover all of the PSoC5LP family.  It doesn't do a great job of differentiating which specific parts have which features.  The CY8C54xxx-series is the lower cost lower feature end of the 'pool'.

           

          To find out a bit better which parts have which features you need to use the Device Selector ...

           

          To do this, select your <project> then right click select "Device Selector ..."

           

          It'll bring up the "Select Device" window.   From there you can use the "Filters" on each column to minimize the display to bring up only those PSoC5s with the features you want.  There is an ADC column.

           

          Based on my count, Cypress has DeltaSigs in the following PSoC5LP parts:

          • CY8C5468AXI-LP042
          • CY8C5868AXI-LP031
          • CY8C5868AXI-LP032
          • CY8C5868AXI-LP035
          • CY8C5868LTI-LP036
          • CY8C5868LTI-LP038
          • CY8C5868LTI-LP039
          • CY8C5888AXI-LP096
          • CY8C5888AXQ-LP096
          • CY8C5888FNI-LP214
          • CY8C5888LTI-LP097
          • CY8C5888LTQ-LP097

           

          Len

          1 of 1 people found this helpful
          • 2. Re: CY8C54LP - Delta Sigma ADC component is missing
            RoRo_4659551

            Hi Len,

             

            Ok thank you very much for your respond

             

            Thanks,

            Roy Roif.

            • 3. Re: CY8C54LP - Delta Sigma ADC component is missing
              LePo_1062026

              Roy,

               

              I'm glad my post was helpful.

               

              Here's a design consideration especially for the PSoC5.

               

              A DeltaSig ADC has the ability to support a higher resolution than an SAR ADC.  The down-side of the DelSig ADC is that its' conversion rate (samples-per-second) are generally lower than what you can get with a SAR.

               

              The other design factor to consider is input and system noise.   Let's say you're input noise is 1/100 of the full scale measurement.   This means that 20dB of signal is comprised of noise.  In this case, a higher resolution ADC measurement might be useless. 

               

              In the example of 1/100 of full scale measure is input noise, you lose more than 13 bits of a 20 bit DeltaSig ADC.   In effect, without averaging, the ADC is of a 7-bit resolution.

               

              It would also take multiple measurements in time to average out most of the noise.  In this case, the SAR sampling at the faster rate might be a better choice.

               

              Len

              1 of 1 people found this helpful
              • 4. Re: CY8C54LP - Delta Sigma ADC component is missing
                RoRo_4659551

                Hi Len,

                 

                Ok that is definitely helping, thank you very much

                 

                Thanks,

                Roy Roif

                • 5. Re: CY8C54LP - Delta Sigma ADC component is missing
                  LePo_1062026

                  Roy,

                   

                  I guess I'm suggesting since you already have the PSoC DVK - CY8CKIT-001, use it with the SAR at least to get an early prototype working.   If your input (and system) noise levels are insignificant and you could use a bit more ADC resolution, substitute a PSoC with a DeltaSig at higher resolution.  The API calls are very similar if not the same in most cases.

                   

                  Another suggestion is to use the CY8CKIT-059.   It retails at Cypress for $10.  I use it ALL the time.  It hits the sweet spot for cost and features.   It has 2 SARs and 1 DeltaSig amongst other internal features.  It also has header connectors to the PSoC pins on the edge of the PCB.  I construct my protoboards to fit this format and mount it above (or below) the PSoC kit.

                   

                  Len

                  • 6. Re: CY8C54LP - Delta Sigma ADC component is missing
                    RoRo_4659551

                    Hi Len,

                     

                    Ok thank you very much sounds good

                     

                    Thanks,

                    Roy Roif