TCAN1043-Q1: CAN timing

Hi Luo,

The INH pin is connected to the VSUP line with a diode to protect the INH line. This diode voltage drop should be about 0.5V - 1V so INH should be about 1V less than VSUP. 

So in your situation, if the VSUP is 11.6V then INH ideally should be 10.6V. However, you likely have components on your INH line that could be affecting this. The exact INH voltage should not affect the operation of the system as long as it is a clear logic high for other downstream devices. 

Regards.

Ethan

Hi Luo,

That is correct, the INH pin is typically connected to the enable pin of a DCDC converter. Your INH pin voltage will satisfy the logic high for 5V, assuming the DCDC EN pin supports voltages this high.

Regards,

Ethan