Vehicle Power

GoogleGroups
1

http://www.v-infinity.com/pdffiles/V78XX-1000%20Series.pdfHi,

I have only just found this device, and it's just the sort of thing I am
looking for. I haven't got one yet, but I have a few questions about
it's suitability in a vehicle.

Has anyone looked at powering the board from a 12v (or 24v) vehicle supply?
I'm wondering if this would be suitable?
http://www.v-infinity.com/pdffiles/V78XX-1000%20Series.pdf
Works up to 32volts.

Also, I want to control the PSU from a PIC (or equivalent) , so that the
BeagleBoard is powered up with the ignition, but only powered down when
Beagle is ready to shut down. Other benefits could be a watchdog timer,
and also a wakeup timer controlled by software running on Beagle (e.g
switch me off, but wake me up in 1 hour). I was thinking about
utilising the UART2 for controlling the PIC, though the expansion socket.

Could I feed 5V into the expansion socket, or do I have to go though the
normal power inputs?
Anyone else interested in this idea? Could be handy not just for
vehicles, but other applications.

Stuart.

2

The device you have selected will do the job of creating the 5V the board needs. You could feed the 5V in form the expansion connector, but if you ever plugged in the USB, you would have an issue. You would need to plug in a connector to the DC power jack to make sure the USB power input was disabled. You can take a look a the schematic and the Reference Manual to get more details on how that circuitry works.

Gerald

3

Gerald Coley wrote:

You would need to plug in a connector to the DC power jack to make
sure the USB power input was disabled.

Thanks, I understand now. I guess what i could do, is feed my 5V supply
in though the expansion socket, and then power a hub from the DC power jack.

4

That would work! Just make sure that you don’t draw too much current through those paths as they are rated at 2A max.

Gerald