Powering BeagleY-AI via expansion port?

General Discussion
1

Hi,

I have a project in which I use an RPI4 which is powered by battery via the 5V pins on the expansion port. I am about to replace the RPI4 with the BeagleY-AI.

But it seems when the BeagleY-AI gets the power via the 5V/GND pins on the expansion port, it actually does not power up: no LEDs light up and the serial line remains silent.

Is it possible to power the device via the expansion port pins or does power have to be fed in via the USB-C port?

Regards
jgrmpf

2

Looking at the schematic the 5V on the header is the same rail as the 5V from the USB C connector so it should work.
Is your 5V on the header supplying enough current ?
Does it drop when the board is powered on.
There is probably an under voltage cut-out on the PMIC so what is the actual 5V supply voltage ?

3

Thanks for the quick answer! Ok, good hint. I’ll check the voltage and if there is a drop which may prevent any PMIC circuit from powering it…

4

If you have a bench power supply, you can always try powering it from that. My guess is you have a slight power drop and the PMIC is keeping the processor in reset.

5

Now it works! I don’t know exactly why. Maybe due to charging the batteries yesterday again, but that was not a long time. But I’ll keep your note in mind and if I encounter problems again, I’ll attach the oscilloscope.

Thanks.