EFM8SB1 STK sleep current higher than expected

by <a href="http://community.silabs.com/t5/Welcome-and-Announcements/Community-Ranking-System-and-Recognition-Program/m-p/140490#U140490"><font color="#000000"><font size="2">Hero Employee</font></font> </a> Stephen on ‎11-04-2016 02:27 PM

Question

The sleep mode current on my EFM8SB1 Starter Kit is higher than expected. What may be happening?

Answer

The Si7021 temperature and humidity sensor is connected to the same supply net (VMCU) as the EFM8SB1 MCU. For accurate EFM8SB1 sleep current measurements, remove the Si7021 from the board.