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ADUM3160 Problems

Question asked by jof on Dec 2, 2014
Latest reply on Dec 3, 2014 by jof

I am having difficulties getting USB coms using the ADUM3160. The downstream side is connected as shown in figure 5 page 3 of the application note to my USB transceiver which is a FTDI USB to Serial UART (MM232R). VBUS2 is supplied with 5v via regulator on the device, I have the suggested caps fitted and can see the expected voltages on VCC and VBUS pins on both sides of the device. The upstream side of the device is connected to my laptop via the USB cable. I have not used any series resistors on D+ or D- lines as mentioned in a previous thread as this is not mentioned in the datasheet. I cannot see high level on D- or low on D+ when the device is idle, on both sides D- and D+ is  0v. I have attached photos of my schematic a circuit board.2.png1.png