In the documentation for the Boron, it doesn’t say the battery is required for the Boron.
However, there is not a VIN port on the Boron.
I was hoping to get some additional clarity on how the Boron might work without a battery, while sending cellular data.
Have you seen the pinout in the block diagramm?
Yes, I see that, but I’m not following the description of VBUS. It looks like its designed to be an output, not designed to power the unit from this port.
Specifically this line:
You can use this pin to power peripherals that operate at such voltages
Is this really designed to power the Boron from this pin?
Would powering the Boron from this pin allow Cellular operation without battery?
Just like the Vin pin on Electrons/Photons it’s an output when the device is powered via USB or an input when not.
Yes, and this backs my claim
The Boron 2G/3G requires a battery if powered by a 500 mA USB power, such as from a laptop, like the Electron and E series. You can use it without a battery if you have a sufficiently large power supply.
The Boron LTE can be powered by a 500 mA power supply without a battery as LTE Cat M1 uses way less power than 2G/3G.
And, yes, you can apply power to the VUSB/VIN pin to power the device and/or charge the battery.
@rickkas7 The VIN of the Electron can be powered at 3.9 to 14 VDC, does this also apply to the VUSB pin of the Boron?
I believe it’s 12V for the VUSB pin when powering the Boron, see
When the Boron is powered via USB, and Vusb is used as an output to power a peripheral, the Vusb port will output 4.5-5v and the output current is limited to the USB port specification. USB v2.0 and prior ports are limited to 500mA. USB 3.0 and newer may supply more current but are not required to. So, if you account for the power draw of the Particle device, you can pull about 450mA from the USB port.
When Vusb is used to power the Particle Device, then the voltage is limited to less than 12V.…
and the next post below that one:
A bit of clarity here. Actually, the Vin pin is connected to the Vusb input via a reverse-voltage protection diode. This diode prevents damage to the powering USB supply when the Boron is also being powered via Vin. It is the Vin pin that should be used to power the Boron with 3.9V to 12V.
The Boron Docs could benefit from a little more clarity on this subject.