Olimex Open Source Hardware Embedded ARM Linux Single board computer with dual core, dual GPU ALLWINNER A20 CORTEX-A7 with addi A20-OLINUXINO-MICRO-4GB 数据表
产品代码
A20-OLINUXINO-MICRO-4GB
OLIMEX© 2013
A20-OLinuXino-MICRO user's manual
6.6 USB_HOST connector
The part of the schematic related to the USB_HOST connector is listed below:
The USB_HOST connector features two levels – called USB1 and USB2 in the schematic. The
connector is situated between the USB_OTG and the HDMI connector. Each of slots them features
a Low Loss Power Distribution Switch SY6280 which protects the board in case the devices you
have plugged to each level USB_HOST try to draw more current than 523mA combined. The
maximum current available on each slot of the 5V USB_HOST is exactly 523mA.
connector is situated between the USB_OTG and the HDMI connector. Each of slots them features
a Low Loss Power Distribution Switch SY6280 which protects the board in case the devices you
have plugged to each level USB_HOST try to draw more current than 523mA combined. The
maximum current available on each slot of the 5V USB_HOST is exactly 523mA.
The SY6280 responsible for the USB1 is enabled by USB0-DRV1 (processor pin A4), thus the
USB_OTG is also controlled by the same signal.
USB_OTG is also controlled by the same signal.
The SY6280 responsible for the USB2 is enabled by USB0-DRV2 (processor pin A5), thus the
USB_OTG is also controlled by the same signal.
USB_OTG is also controlled by the same signal.
USB_HOST two-level connector
Pin #
Signal name Processor pin
Pin #
Signal name
Processor pin
1.1
5V
Connected to SY628
2.1
5V
Connected to SY628
1.2
UDM1
P20
2.2
UDM2
R20
1.3
UDP1
P21
2.3
UDP2
R21
1.4
GND
-
2.4
GND
-
The GND is common for both levels of the USB_HOST.
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