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SAADC Scan Mode High Quiescent Current

In an effort to try and determine why FreeRTOS tickles idle is consuming more current than tick mode with an idle task, see this post devzone.nordicsemi.com/.../, I noticed that our project still had build time define for NRF52_PAN_28. I removed this define and the quiescent current increased to ~1.5mA. The waveform shows a pronounced offset like a peripheral or clock is being left on. I will post a waveform comparison tomorrow.

Notes:

  • ADC is a FreeRTOS task which has a period of ~160ms.
  • The intent is to sample 8 channels via scan mode
  • The task also uses the internal temperature sensor
  • SDK11, S132 v2.0.0.0, chip is QFAABB (Rev C)
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