Table of Contents
Advertisement
OLIMEX© 2015
A20-OLinuXino-MICRO user's manual
The preferred way of powering the board is via the PWR jack with 6-16V DC with a power of 5W
(e.g. 6Vx0.8A; 16Vx0.3A). This will make the board fully powered and able to power all the
peripherals connected to it.
Note that when powering the board from the USB_OTG, the power provided might be insufficient
to also power a bigger LCD connected to the LCD_con. However, this power option is capable of
driving the board when using external display connected to the HDMI connector.
The typical consumption of A20-OLinuXino-MICRO-4GB is between 100mA and 320mA
depending on the current load and the power voltage applied.
If the board has entered power-down state you can bring it back without restart using the
PWR_BUT. The PWR_BUT is also used to start the board when powered from a Li-Po battery on
the battery connector.
Sometimes when starting Android it is possible the board to enter battery save mode even before
booting fully. Especially, if you have turned off the board without quick boot mode enabled. In this
case you should press the PWR_BUT for at least 5 seconds which would allow the board to start.
For the European customers we sell two power supply adapters, please check chapter 2.2. We also
sell USB OTG to USB type A cables if you lack such.
The default username/password combination for the default Linux image on the SD card (if
purchased) is: root/olimex.
Note that it is normal that when the board is powered some integrated circuits might appear hotter
than others. This is perfectly normal for some chips – for instance – voltage regulators and the main
processor.
2.4 Prebuilt software
The 4GB board-variant comes with Android 4.2.2 ready to use. The default settings of the software
are followed. The default image works with HDMI monitor and 7'' display.
How we have installed the software? Detailed information might be found in chapter 6.1.1 USB-
OTG communication (NAND firmware repair/update).
2.5 Button functions
The bellow three buttons usually are supported under both Android and Debian:
PWR_BUT – used to perform software turn off, software turn on; used to turn on board when
powered by battery – has to be held down for at least couple of seconds to perform each action
RESET – used for hardware reset of the board – it is not recommended
RECOVERY – used to wake up the board from sleep
The following buttons represent functions in the Android (it is possible that not all Android
applications take advantage of the buttons, in such case the button would serve no purpose for that
application):
Page 10 of 56
Advertisement
Table of Contents
