Yes, the master/slave makes sense. I missed that. 

Have you been able to view the i2c waveform? Can you send a scope capture for the i2c address by the master? 

Yes, the mast/slave makes sense. I missed that. 

Have you been able to view the i2c waveform? Can you send a scope capture for the i2c address by the master? 

Only the registers 0xC6 and 0xC7 are retained in sleep mode. We'd have to program a new part which has the averaging filter enabled to achieve what you are describing. We do offer custom programmed parts to customers. Please contact your local sales rep. We do require minimum order quantities. 

Sorry for the delay. We had some severe weather which caused a lot of power outages the past week.

When you are getting 0xFF in return, are you sure the sensor is returning that value? I think the sensor is returning NACK to the address and your host is not configured to handle the ACK error. So it's reading 0xFF.

The slave address for the Si7021 is 0x40. I notice that you didnt change the the address in the configurator. Can you please try changing the address?

Hi, I'm raising your community post to a technical support ticket. This isnt something that should be discussed on the forum.

You shouldve gotten an email response from me already. If you haven't, i'll need to get your email from you to make sure the technical support case emails are being sent to the correct address. 

Hi, I'm raising your community post to a technical support ticket. This isnt something that should be discussed on the forum.

From looking at the User Guide and the layout file, the location of the sensor on the pcb is not ideal for an ambient temperature sensor. The proximity of the sensor relative to the other components and especially the power input are not advised.

The ideal location would have been one of the top corners. Then push down all the other components as far as possible so that they are not close in proximity to the temp sensor. Using the corner of the PCB, you can optimize the paddle design. Maintaining a minimal pcb thickness is also recommended to reduce the thermal mass. 

From looking at the User Guide and the layout file, the location of the sensor on the pcb is not ideal for an ambient temperature sensor. The proximity of the sensor relative to the other components and especially the power input are not advised.

The ideal location would have been one of the top corners. Then push down all the other components as far as possible so that they are not close in proximity to the temp sensor. Using the corner of the PCB, you can optimize the paddle design. Maintaining a minimal pcb thickness is also recommended to reduce the thermal mass. 

Hi Yef,

The si7021.c/h files can be found in the thunderboard bsp folder in simplicity studio:

C:\SiliconLabs\SimplicityStudio\v5_3\developer\sdks\gecko_sdk_suite\v3.0\hardware\kit\common\bsp\thunderboard