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Voltage drop when connecting IKS01A2 to B-L072Z-LRWAN1

Question asked by Robbe Elsas on Apr 3, 2018

So the B-L072Z-LRWAN1 board is configured to be powered through the 3.3V pin by removing SB6 and R26. Furthermore, the ST-LINK was disconnected by removing SB28, SB29 and SB37. When testing with some example code and the X-NUCLEO-LPM01A power board everything works fine. However, when connecting the IKS01A MEMS shield to the B-L072Z-LRWAN1 board, either with the arduino connector or with the dedicated J2 header, the system voltage drops from 3V to approximately 1.4V causing the B-L072Z-LRWAN1 to halt correct operation. I haven't made any chaanges to the default solder bridge/jumper config of the IKS01A2 MEMS shield and its datasheet is wildly obscure when it comes to the power config. Has anyone had a similar problem and if so how do I fix this?