ETRA SOM/ETRA Evaluation Kit/Interfaces and Connectors/USB ports
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| History | |||
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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
- J16 is a micro-AB type receptacle for a USB OTG connection: this interface can operate in Host mode and Device (peripheral) mode
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 |
|---|---|---|---|---|
| 1 | J18.188 | USB_HOST_VBUS | VBUS | |
| 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.
