Tool/software:
Hello,
we are debugging an Ethernet circuit which functions at normal and higher temperatures but fails at lower temperatures. The explanation below may not be the cause but I wanted it checked.
At the Ethernet transceiver:
I am using TMUX1121DGKR between an I2C EEPROM and and Ethernet transceiver as an isolator. The circuit works but overall we are having lower temperature problems on the Ethernet where Ethernet doesn't work and suspect a start up problem. I am not sure if it is related to this circuit but I wanted to get this checked. The original evaluation board shows 1K pull ups on the I2C lines between the Ethernet transceiver and EEPROM. I have 10K on the Ethernet side of the TMUX1121DGKR and 4.7K on the EEPROM side. How should I adjust the values to make them close to 1K as seen by the Ethernet transceiver which is the bus master.
At the host Intel CPU:
The bus master accesses the EEPROM via TMUX1121DGKR. In the original evaluation it was direct so the pull ups are on the host side that I don't have visibility or i do not know the value. I placed 4.7K on the EEPROM side. Can I get rid of them and will they work? or do I need them on both sides?
Thanks,
Divakar
