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Messages - MF3

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1
General Discussion / Re: FT232H not seen by Windows 10
« on: April 27, 2021, 12:56:26 PM »
Further analyses of the schematic revealed 100R in series with D+ and D- lines for ESD protection, value too high for High Speed USB.
We'll run some tests for a suitable value. With no resistors in series works fine.

2
General Discussion / Re: FT232H not seen by Windows 10
« on: April 27, 2021, 09:45:37 AM »
Hello again!

I made some measures on the usb line and the data "exchange" is strange. On the FT232H datasheet I read that it's a FS/HS device so I expected both types of waveforms. If the device is connected to the windows 7 computer, it works as expected: pull up, device descriptors requests, and keep alive, all at 3 volt. The attachment shows (poorly, sorry) the D+ D- waveforms when communicating with my Windows 10 machine.  I expected to see 3V amplitude like with the previous PC. The amplitude of the small signal is around 600mV and it looks like a J-K pattern, like it's trying to configure for High Speed but without success.
When the USB is plugged in, I see the D+ line pulled up but it immediately starts behaving as the attachment shows.

There is a way to "force" Full Speed on windows or on the pcb?


3
General Discussion / FT232H not seen by Windows 10
« on: April 26, 2021, 11:35:38 AM »
Hello community!

I have an issue with FT232H. It's used as USB-232 interface and lately we started to have problems on Windows 10 machines: the device is totally not detected (no "usb inserted sound", no changes in Device Manager, no device detected in FT-Prog). The only sign that the converter is plugged in can be found in USBView, where, if continuously refreshing, sometimes a "USB Streaming" appears in the position where the converter is plugged. Unfortunately all the parameters of this random popping device are zero, so it's not very useful.

On the other hand, on a Windows 7 machine, the device is correctly detected by Windows and all the other applications. One thing i noticed is the FT232H converter could not be programmed, FT-Prog says something like "Can't program, device removed?".
[EDIT] Opening the device I saw the EEPROM was not implemented, so the FT232H runs its default mode.

Usb descriptors change in a coherent way (being it a different chip) aside, maybe, from power demand, where FT232BL presents itself as bus/self powered with 90mA and FT232H as bus powered with 500mA. But maybe it's right!

I also saw that the info in FT-Prog were different from those in USBView (e.g. the descriptor string of FT232H on FT-Prog is "USB <-> SERIAL" where in USBView and in Devices/Printers is "SINGLE RS232-HS".

Can someone give me some pointers about this problem?
Thank you in advance, have a nice day!

MF3

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