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Use GPIO as ADC - Nordic Q&A - Nordic DevZone - Nordic DevZone
nRF52840 SoC IO schematic (7 mm x 7 mm 73 pin AQFN package) [6
nRF52840 #1: Bluetooth 5 Preview Development Kit - YouTube
Difference between nRF52840 Engineering A and B reference designs
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NRF52840 Development Kit N RF52840 Pca10056 Dev User Guide V1.2