[GitHub] [mynewt-core] shanyechungu edited a comment on issue #2338: nrf52 SAADC single ended samples GND returns 65535 indicating mode configuration errors.

[GitBox <gi...@apache.org>]

shanyechungu edited a comment on issue #2338:
URL: https://github.com/apache/mynewt-core/issues/2338#issuecomment-663128693


   Never mind. This seems like a hardware issue.
   
   In their SDK->SAADC (https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fsaadc.html)
   
   It states the following:
   
   _The assumption in single-ended mode is that the internal ground of the ADC is the same as the external ground that the measured voltage is referred to. The ADC is thus sensitive to ground bounce on the PCB in single-ended mode. If this is a concern we recommend using differential measurement._
   
   I am using PCA10056 which is the official DK board. I still have this ground bounce issue. For developers, they may want to avoid this issue by using differential mode.
   
   
   
   


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