INA239: Con not get SO signal from INA239

Hello,

Thank you for using the TI forum. Were you able to use the EVM with the GUI? Found here: https://dev.ti.com/gallery/info/CurrentSensing/INA228_229_237_238_239EVM_GUI

Or are you only using your own custom controller and firmware? If you are using your own firmware, did you use any of the code for the INA239 from SysConfig? Found here: https://dev.ti.com/sysconfig/index.html?product=ascstudio&module=/ti/sensors/currentsensor/INA239 

Regards,

Mitch

My Question, base on the wave form ( attached to this case ) do you see any problem ?

can you explain what can be wrong ? 

Regards

Shlomy

Hello Shlomy,

Looking over the scope shots, it's hard to say for sure if there is a problem.  It looks like you are on the faster edge of possible communication. For example, the minimum clock high time from the datasheet is 40ns. Looking at your plots, it's hard to say for sure if that timing characteristic is being met, though I think it should be fine. It wouldn't hurt to slow down your communication and see if that fixes the issue. What register values are you trying to read? Could you not get any response from any registers? I generally recommend trying the manufacturer and die id registers first, as they always have a known value.

This is why I was asking my other questions. If the device works fine with our GUI/Firmware, then the issue would likely be in your firmware/setup. If the device does not even work with our GUI/Firmware, then there could be a problem with the device. 

Regards,

Mitch