I2C fails when multiple sensors are connected

anishrr

Hello all,
I am using up2v2 with ubuntu (kernel: 5.15.0-91-generic). I am facing a problem with I2C port when multiple slaves are connected to it. I used a logic analyzer to probe SCL and SDA pins. The active low voltage of SDA and SCL pins are not zero (It was around 300 mV).
To be sure, Then I configured the SDA and SCL pins as GPIOs and measured the active low voltage. It was the same 300 mV.

Is there a way to make the active low voltage close to 0 V.?

HarryChiu

Hi @anishrr

Sorry for late reply.
Could you please provide more informations??
What is your bios version??
If remove all the external devices/sensors, will it close to 0V??

Best Regards,
Harry Chiu