OLIMEX© 2017
A20-OLinuXino-LIME2 user's manual
6.5 USB_HOST connectors
The part of the schematic related to the USB_HOST connectors is listed below:
There are two USB host connector featured on the board. They are called USB_HOST1 and
USB_HOST2. Each of them has own connector, both situated near the Ethernet connector. Each of
connector has own low loss power distribution switch SY6280 which protects the board in case the
devices you have plugged to the board try to draw more current than 523mA combined. The maximum
current available on each of the USB hosts is exactly 523mA.
The SY6280 responsible for the USB_HOST1 is enabled by USB0-DRV1 (processor pin A4).
The SY6280 responsible for the USB_HOST2 is enabled by USB0-DRV2 (processor pin A5).
USB_HOST connectors
USB_HOST1
Signal name
Processor pin
USB_HOST2
Signal name
Processor pin
Pin #1
5V
Connected to SY628
Pin #1
5V
Connected to SY628
Pin #2
UDM1
P20
Pin #2
UDM2
R20
Pin #3
UDP1
P21
Pin #3
UDP2
R21
Pin #4
GND
-POWER CIRCUIT-
Pin #4
GND
-POWER CIRCUIT-
The GND is common for both levels of the USB_HOST.
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