sleep current during BLE advertising

Question

i'm measuring approximately 1.5uA (at 3V3) when sleeping between BLE advertising events, using a program based on one of your the standard examples.... as an experiment, i built a trivial simple program that retains only SRAM blocks 0-1, enables the LFXTAL, and starts the RTC.... when sleeping, this program consumes about 1.68uA.... 
 so now i'm curious as to what is *NOT* power/enabled/retained while the BLE program is sleeping???

bios-bob · Accepted Answer

hi vidar, 
 you nailed it!!! in my quest to minimize program size, i often find many of these while loops unnecessary.... indeed, but program "worked" -- but clearly missed the mark from a power perspective.... for sure, this is similar to the errata you cited -- though arguably there is a workaround.... 
 as a consequence of your insight, i have a very small (~2K) BLE advertising program written in EM&bull;Script which shows ~15% energy savings versus the Zephyr BLE advertising program attached earlier.... (FWIW, this code also supports the nRF54 series as well....) 
 again, thanks for the EXCELLENT support.... 
 bob.

sleep current during BLE advertising

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