ADUM3160 ST-link

Dear,

We have a set-up with the ADUM3160BRWZ-RL going to an usb hub to an ftdi and an st-link. Without this IC it works great, with it doesn't work (tried speed options and pull-up/down options but this has no effect).

Also tried without voltage isolator (DC/DC), short 5V and GND so it is no longer isolated, but also no effect

Greetings

  • +1
    •  Analog Employees 
    on Dec 18, 2020 10:59 AM 2 months ago

    Hi,

    Apologies for the delay in responding. Can you please mention what specific IC is connected to ADuM3160, cropped off on the right of the schematic? I note there's a 24 MHz crystal connected which is usually required for USB 2.0 high speed mode (480 Mbps). ADuM3160 only supports low (1.5 Mbps) and full speed (12 Mbps) modes.

    With the DNP resistors on SPU, SPD as shown, they will be pulled high, placing the device in full speed mode (12 Mbps).

    Best regards,

    Conal