USB to RS485 problem

[plig]

Hello,

I designed an USB to RS485 converter, but got some problem with the FT232RL chip. As soon as i connect usb to the pcb and look at FT_prog where i need to program the chip, it works, but after 10sec it stops working and i get an error that the USB device is not recognized.

I added the schematic and PCB. Any suggestions would be appreciated.

[Piokangtya]

Since the device works initially, Deadshot IO I would first monitor the FT232RL's supply rails and temperature, then test the FT232RL with the RS485 section isolated. That should quickly distinguish a USB/FT232RL problem from an RS485-side problem.

[Jenny1425]

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