I have tested the LoRaWAN_End_Node example on a B-WL5M-SUBG1 board and I measure power consumption of 1.7uA when the processor is in STOP mode between transmissions. This is exactly what I expected to see.
I designed a very simple custom board based on the B-WL5M-SUBG1 design, downloaded the same .elf file to it, and it communicates with my LoRaWAN gateway as I expect. However I measure ~300uA current draw while it is in STOP mode. I have compared my custom board schematic to that of the B-WL5M-SUBG1 several times looking for a difference that would account for that much extra power consumption and I just have not found it.
I am using STM32CubeMX v6.16.0, STM32Cube FW_WL V1.4.0, and the part is STM32WL5MOCH6TR. I have attached the schematic of my custom board.
I am hopeful that someone can see what I have missed.
