DS80PCI102: /PRSNT pin internal register

Hi,

There is no internal pulldown resistor on the PRSNT# pin.  I would not expect any leakage through the device up to the 3.3V VIN supply level in 3.3V mode.  Are you supplying the 2.5V power externally?

Regards,

Lee

Hi Lee,

We use DS80PCI102 as 3.3V mode, so do not supplying 2.5V power externally.

Please let me add more information.
We use two DS80PCI102.
Connect Open-drain between "one" Controller's GPIO and "two" DS80PCI102's /PRSNT pin.

We change external pull up register value from 10k ohm to 1k ohm for analysis,
then we measured about 3.3V at /PRSNT pin.

Thanks for the additional information.

I measured the PRSNT pin voltage on an EVM in the lab.  There is an internal pullup and pulldown on this pin.  The pullup is 30K and the pulldown is 60K.  This creates a floating voltage of ~ 2/3*Vin. 

Regards,

Lee

Hi Lee,

Thank you for evaluation and kind support