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In this article you can find some additional information to the SODIMM pins of the Colibri modules.

Please note that this list is not complete and discusses just a few pins

Signal Name Recommendation
3.3V, GND Digital Supply Make sure all 3.3V and GND pins are connected and you use decouple capacities.
VCC_BATT Supply for internal RTC Make sure this pin is powered even if you don't use the internal RTC
VSS_AUDIO, AVDD_AUDIO Analog Supply Make sure you supply this even if you don't use any of the analog functions. If you use analog function, we recommend to use an additional regulator to get a clean analog supply.
nCSx Chip Selects Pull this pins high if you use the external memory bus