FT232R bus powered configuration

Serdino

Hi there!

Some problems with FT232R in high-power buspowered configuration...
Datasheet asserts a·PWREN# configured pin has to stay·high during enumeration, low after, granting
the correct work of the port.
Tracking·PWREN# signal with an oscilloscope i noted a strange behaviour during enumerating period,
bringing the signal to change state several times.
On the contrary the·FT232BM behaviour is correct and PWREN# reamains high during the initial phase
then goes low when the device is enumerated.

Did someone·have this kind of·problems with FT232R in high-power buspowered configuration and how
did you solve it?

Thanks,
Serdino

Phil Pilgrim (PhiPi)

Yes, this is a known issue with the FT232R. Here is a discussion that covers it, along with possible workarounds.

-Phil