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BeagleBone Power Consumption during Kernel Boot

g.f.
Guru 15520 points

Hi,

We are discussing about the power consumption of BeagelBone(AM335x).
In the documentation of BeagelBone page.28
"Table3. BeagleBone Power Consumption(mA@5V),
it said power consumption is 350mA at Kernel Booting.
(In this case I think ARM is operating at 720MHz)
http://beagleboard.org/static/beaglebone/a3/Docs/Hardware/BONE_SRM.pdf

I would like to know the power consumption at the time of kernel boot
when the ARM is operating at 275 MHz? I hope it is under 200mA.
If someone know the power consumption, please let me know.

best regards,
g.f.

 

  • 0
    Expert 2280 points

    When USB-powered, bootloader will set 500Mhz, while 720Mhz when AC-powered.

    Comment under that table states that "When the USB is connected, the FT2232 and HUB are powered up. This causes an increase in current. When the USB is not connected, these devices are in a lower power state. This is accounts for roughly 120mA of current and is the reason for the increased current when the USB is connected."

    That would mean that when board is USB-powered, processor consumption during kernel boot @ 500MHz is 502-120 = 382 mA, which is greater than 350 mA @ 720 Mhz when it is AC-powered. It sounds strange, maybe am I missing something?

    But are you interested in specific Beaglebone consumption or on a generic am335x-based board consumption?

    Regards

    Max