I've found that FTDI is pretty responsive to engineering inquires, dependin=
g on your location.  I believe I've talked to the group in the US NW area b=
ut its been a few years.

You might consider it being a counterfeit chip as well...give them the date=
 codes on it and see if they come back as valid.

I've had enumeration issues in the past and it was due to invalid data in t=
he part...bricked...and had to use their utility to get it back to working =
properly but I haven't seen your particular issues.

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of=
 Richard Prosser
Sent: Wednesday, December 03, 2014 3:50 PM
To: Microcontroller discussion list - Public.
Subject: [EE:] FTDI FT230X Problems

Hi All,
We are using the FTDI chip FT230X in a new product (about to be released) a=
nd are having difficulties with it. I wonder if anyone else is using this c=
hip and has had similar difficulties.

The problems present as follows.:
1. Failure to enumerate on the USB system. I have found however that chilli=
ng the chips with freeze spray gets them working again, and once working th=
ey tend to stay working until the next restart.
2. Corrupt configuration. Sometimes fixed by reprogramming (once
enumerated) using the FTDI utility.
3. Low output on one of the programmable output C-bus lines. This should ha=
ve a high level of 3.2V, but sits at 0.8V. Freezing the chip has also fixed=
 this in one test case.

The fault rate for these chips appear to be about 20 - 30% . All voltages a=
nd reset controls are with datasheet requirements. Chips are beleived to be=
 genuine FTDI.

So - has anyone had similar issues, or ideas as to what the problem could b=
e other than faulty chips?

Thanks,
Richard
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