USB3 OTG Host Connectivity

If higher transfer rates are needed, use the USB host functionality through the USB3 port 1. A Type-A receptacle (female USB connector) is, in this case, used to carry the signals from USB3 port 1 and USB2 port 1. Because this setup is not supporting firmware updates, a separate USB2 device connector (see USB2 Device Connectivity) is needed.

 

The USB3 OTG connector can provide +VBUS to attached devices by generating a 5 V supply on the Intel® Joule™ expansion board from +VSYS or a 5 V supply.

Place a load switch, enabled by +VDD3, between the 5 V supply and USB +VBUS, with a set 1 A current limit. If +VSYS is fixed at 5 V, a boost regulator is not needed and a load switch is sufficient. It is good design practice to add ESD protection diodes, a PTC fuse, and an EMI filter to +VBUS, and to add common-mode chokes that have built-in ESD diodes to USB data signals.

Note: The series capacitors required for the TX lines for USB 3.0 signals are already designed into the Intel® Joule™ module itself.

 

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