OLIMEX OLinuXino-MICRO, User Manual

Page: 21 / 48

OLIMEX© 2012 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
OLinuXino's reset circuit includes R9 (47KΩ), R10 (47 Ω), T1, T2, Q1 and a RESET button. The
RESET is specific for the fact that it is accomplished when the quartz is disconnected using 3.3V
and the transistors T1 and T2.
5.2 Clock
24 MHz quartz crystal Q1 is connected to pins 121 and 122 of the iMX233 processor.
5.3 Power supply circuit
The board is powered by 5V supply and all measures listed below are taken at 5V external supply.
If measuring the current consumption it should be around 0.06A before initializing all the
peripherals.
If you have successfully booted and powered the board the green LED1 will start blinking (you
have to put a SD card with Linux image in the SD card holder).
Page 21 of 47