User 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:

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.

The SY6280 responsible for the USB_OTG is enabled by USB0-DRV (processor pin C12, port B9),

thus the USB_OTG is also controlled by the same signal.

Please note that the USB0-DRV (PC17, processor pin F23) also goes to the AXP209!

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