ETRA SBC/Interfaces and Connectors/USB ports

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Issue Date Notes
2021/01/14 First Release

USB ports[edit | edit source]

Description[edit | edit source]

ETRA SBC provides two USB ports, one HOST and one OTG:

  • J17 is a standard USB HOST 2.0 Type A connector

USB HOST connector

  • J16 is a micro-AB type receptacle for a USB OTG connection: this interface can operate in Host mode and Device (peripheral) mode

USB connector

Signals[edit | edit source]

The following table describes the interface signals:

USB HOST[edit | edit source]

Pin# SOM Pin# Pin name Pin function Pin Notes
2 J18.202 USB_DM1 USB Host Data -
3 J18.200 USB_DP1 USB Host Data +
4 - DGND Ground
5, 6, 7, 8 - PCB_GND_RNG Shield

USB OTG[edit | edit source]

Pin# SOM Pin# Pin name Pin function Pin Notes
1 J18.185 VBUS_OTG_IN VBUS Can be used to power the board
2 J18.196 USB_DM2 USB OTG Data -
3 J18.198 USB_DP2 USB OTG Data +
4 J18.72 PA8 USB OTG ID
5 - GND Ground
6, 7, 8 - PCB_GND_RNG Shield

Device mapping[edit | edit source]

The USB Host port can be used under Linux for connecting USB peripheral devices: the related peripheral driver has to be integrated into the Linux kernel.

The USB OTG feature can be easily tested using the Mass Storage Gadget driver.