OLIMEX© 2017
A20-OLinuXino-LIME2 user's manual
6.3 PWR jack
The power jack used is the typical DC barrel jack one used by Olimex (2.1×6.3×9.2mm) in most of our
products. More information about the exact component might be found here:
https://www.olimex.com/wiki/PWRJACK
You should provide 5 volts direct current and the required current may vary depending on the peripherals
connected to the board. The power supply you use should be capable of providing at least 1A of current.
Pin #
Signal name
1
Power input
2
GND
More info about the power supply can be found in chapter 5 of this manual.
6.4 USB_OTG
The main way of changing the firmware image located on the NAND of A20-OLinuXino-LIME2-4GB is
via the USB-OTG connector – the update of the Android image is explained at the bottom of this sub-
chapter. The connector can also be used for establishing SSH connection to the default Debian Linux of
LIME2 boards (for more information about the tethering please refer to “2.5.4 SSH via mini USB cable in
Debian”). The part of the schematic related to the USB_OTG is shown below:
USB_OTG connector
Pin #
Signal name
Processor pin
1
+5V_OTG_PWR
-POWER CIRCUIT-
2
UDM0
N20
3
UDP0
N21
4
USB0-IDDET
B5
5
GND
-POWER CIRCUIT-
The USB_OTG features Low Loss Power Distribution Switch SY6280 which protects the board in case
the devices you have plugged to the USB_OTG attempt to draw more current than 523mA combined. The
maximum current available on the 5V USB_OTG is exactly 523mA.
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