Minnowboard:Jumpers and Headers
The Figure below annotates a few important Jumpers and Headers on the MinnowBoard. Please note that headers like J12(Gigabit ethernet) which are self explanatory have not been annotated or covered here.
It is a jumper that will hold the Real Time Clock in reset. This was done for early diagnostics on the MinnowBoard and will be removed in the revision A1.
It is a power header that is intended to provide power to an external 2.5" form factor hard drive. Larger hard drives require +12V in addition to +5V, however the 2.5" laptop style hard drives only require +5V. This header only provides ground and +5V.
It is a two pin header designed to indicate SATA activity via a LED. It is provided just in case someone wants to put the MinnowBoard in a case and also monitor the hard drive activity.
It is a three pin header that allows you to choose how to control the +3.3V power to the expansion headers. Pins 1-to-2 configure the +3.3V to be always ON. Pin 2-to-3 configure the power to be controlled via the Atom core GPIO4. This allows you to toggle the power using standard GPIO controls.
It is a two pin header that allows you to provide power without using the J15 barrel jack. This can be used with battery configurations or test bench configurations where a barrel jack input might not be practical.