OLIMEX© 2013
A10S-OLinuXino-MICRO user's manual
CHAPTER 5: CONTROL CIRCUITY
5. Introduction to the chapter
Here you can find information about reset circuit and quartz crystals locations, the power supply
circuit is discussed.
5.1 Reset
The board has no hardware reset. The reason behind that is the memory problems using such a
strategy causes. When the NAND memory performs read/write operation and the user resets the
board this might cause NAND corruption.
The board should be turned off the standard OS menu (that might be invoked by holding POWER
button) and after the choice is confirmed it is safe to be disconnected from the power supply unit.
5.2 Clocks
25 MHz quartz crystal Q1 is connected to pins 46 and 47 of the RTL8201CP chip (the same chip
controls the Ethernet).
24 MHz quartz crystal Q2 is found at pins U20 and V20 of the A10s microcontroller.
5.3 Power supply circuit
The power supply is handled mainly by AXP152 power management system, an Allwinner chip that
goes together with the A10s processor. It is mounted on the board but since it is relatively hard to
find we also sell it separately.
The power supply circuit of A10S-OLinuXino-MICRO requires input supply of 5V. The minimum
amperage suggested is 1A, and this threshold may raise if using a lot of devices on the USB-HOST
(via external hub), a lot of GPIOs and the LCD_CON.
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