I stand corrected ... like I said I am a newbie to the BBB. Respectfully, Dan Metcalf On Dec 23, 2013 7:27 PM, "Charles Steinkuehler" <char...@steinkuehler.net> wrote:
> Actually, VDD_5V is raw 5V power, connected directly to the DC power > jack. It is absolutely possible to power the BeagleBoard this way, and > I have several capes that do so and work just fine (the BeBoPr and K9) > powering the 'Bone via VDD_5V. > > The LED behavior likely indicates something is going wrong with booting > the operating system. The easiest way to debug these issues is with a > serial port cable, so you can see what's happening. As a guess, you may > be tying some other pins (specifically the LCD_DATA lines) to circuitry > and messing up the AM335x boot process. By changing the values on these > signals at reset, you can determine if the CPU should boot from eMMC > flash, SD card, ethernet, USB, serial, etc., so messing this up can > easily result in a system that won't boot. > > Double-check the LCD_DATA lines, and get a serial debug cable so you can > see what's going on. > > On 12/23/2013 3:05 PM, Daniel Metcalf wrote: > > I am not sure you can power it that way. I am a newbie to beaglebone > black > > but checkout page 110 of 124. > > Pin 5 of J9 is VDD_5V which is described as the following: > > > > *VDD_5V *is the main power supply from the DC input jack. This voltage is > > not present when the board is powered via USB. The amount of current > > supplied by this rail is dependent upon the amount of current available. > > Based on the board design, this rail is limited to 1A per pin from the > main > > board. > > > > I believe it is an output from a regulator. > > > > You are going to want to connect to TP5 - BAT, TP8 - GND, TP6 - SENSE > > > > > > > > > > On Mon, Dec 23, 2013 at 3:30 PM, José Luis Redrejo <jredr...@gmail.com > >wrote: > > > >> I've made a power supply to power my BBB, but whenever I connect it > >> (to pins 5 & 1 of P9 connector for VDD & GND), the power led blinks > >> for some seconds and then it is off. > >> > >> The output comes from a 7805CKCT, which can provide up to 1.5A. > >> > >> It's a typical power supply from a rectifier + capacitors + regulator. > >> > >> What does this "blinking" mean? any ideas of what is going wrong? > >> > >> Regards > >> José L. > >> > >> P.S. The board works perfectly plugging it to a computer via USB > >> > >> -- > >> For more options, visit http://beagleboard.org/discuss > >> --- > >> You received this message because you are subscribed to the Google > Groups > >> "BeagleBoard" group. > >> To unsubscribe from this group and stop receiving emails from it, send > an > >> email to beagleboard+unsubscr...@googlegroups.com. > >> For more options, visit https://groups.google.com/groups/opt_out. > >> > > > > > > > > > -- > Charles Steinkuehler > char...@steinkuehler.net > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google Groups > "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to beagleboard+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
