5 Replies Latest reply on Mar 22, 2018 8:14 AM by KTrenholm_1955226

    ADC_SAR_SEQ Component using more macrocells than datasheet spec?

    KTrenholm_1955226

      Hi all,

           I've got an issue with the ADC_SAR_SEQ component that I'd like to get to the bottom of.  I'm looking to replace a regular ADC_SAR component w/ a Sequential ADC_SAR (see Handling multiple analog inputs/polling rates using an Analog Mux/SAR ADC for the genesis of this issue).

       

      With the standard ADC_SAR + AnaMux setup, my project weighs in at 123/192 Macrocells used.  This leaves me with 69 free.  The datasheet for the ADC_SAR_SEQ v2.0 claims for a default setup, the component uses 43 Macrocells.  When I attempt to actually build the ADC_SAR_SEQ into my project (deleting the original ADC_SAR), I am now over the limit at 199 Macrocells, which puts the ADC_SAR_SEQ at a whopping 76 Macrocells used.  Where is this huge discrepancy coming from?

       

      ORIGINAL ADC_SAR:

      ADC_SAR.png

      ADC_SAR_Cfg.png

       

      ADC_SAR_SEQ:

      ADC_SAR_Seq.png

      ADC_SAR_Seq_cfg.png