I have an existing SOM-LV design that is showing a USB port issue when using a new (to this platform) device. When this new device is plugged into the OTG port, the USB will cycle disconnect/connect. The device is attempting to pull ~450mA through the port. The VBUS (+5v) is repeatably cycling on/off.
I don't have schematic for the SOM. As a registered user, can I get one? (Where can I find one?)
It appears the SOM is using the tps65950 USB-phy for the OTG port. Is this true?
I suspect the SOM can not supply the current to keep the device happy. So the VBUS power (pin21) is being tripped off, then is cycled back on,... and so it goes. Is there some reason VBUS power is coming from the SOM? Why am I not seeing a USB-pwr-ena (pin25) signal from the SOM? (So I can use my own USB power-monitoring circuit/control.)