5V_E; V_E And 3.3Vio_E Jumpers; Boot Mode Selecting Jumpers; Additional Hardware Components - OLIMEX OLinuXino-MAXI User Manual

Open-source single-board linux computer

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OLinuXino User's Manual

6.12.2 5V_E

The 5V_E jumper allows control over the powering line. If you want to disable the 5V powering

line open 5V_E jumper.

The default position is closed.

Important these jumpers must be moved together! Closing both of 3.3V_E and 3.3VIO_E at

the same time will damage the processor. One of them has to be open (unsoldered/cut). There

are two possible positions:

1) 3.3V_E closed (soldered), 3.3VIO_E open (unsoldered/cut)

2) 3.3V_E open (unsoldered/cut), 3.3VIO_E closed (soldered)

In the default variant 1) the board uses the mounted by OLIMEX DC-DC 3.3V convertor which

when the board is powered by external supply is the better alternative. However, if you use battery

it will not power the chip handling the USB and the LAN functionality. Basically the board will

lack USB-HOSTs and LAN when jumpers are set in variant 1) and the board is powered by a

battery via the BAT connector.

If you set the jumpers in 2) state the board's 3.3V will be handled by the built-in iMX233 DC-DC

but the problem is it isn't configured to be used with another chip so it doesn't provide enough

current for all the USB-HOSTs and the LAN which might cause some of the devices plugged in the

USB to lack power and also might burn the chip if too much current is drawn. However, in this 2)

mode of jumpers it is possible to power the board from a battery and still have some current on the

USB-HOSTs and the LAN. The maximum current the built-in DC-DC can provide safely is

200mA.

The boot mode is discussed in chapter 6.11 of this manual.

The components below are mounted on OLinuXino but are not discussed above. They are listed

here for completeness:

Reset button - used to reset the board

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