Hi, I have a TUSB4020 on a custom board and am noticing the SCL/SDA lines sitting at around 2.7V. The bus on my board only connects to two other I2C devices, one of them being the Master controller. When I disconnect the SCL/SDA pins from the bus, the bus goes back to 3.3V. The bus on the board has 4.75k ohm pullups up to a 3.3V power supply. I also have the TUSB4020EVM in my possession, and was surprised to see that when the DIP switch was flipped so the pullups on the bus were enabled and the SMBUSz pulldown was enabled, the same result occurred. I measured about 2.5V on the bus while it idled. Is this a known issue? Or is there potentially something else in the setup of the device that is causing this, that would also effect the EVM.
I saw in the datasheet these I2C lines have an internal pulldown, how strong of a pulldown is internal to these pins? Seems it would need to be strong to effect a 4.75k pullup, if that is indeed the issue..
For context I have also tried activating the reset line to see if that fixes it due to a power sequencing issue and it doesn't.
Thanks!
