Boron can't connect to cellular when not computer USB powered

Connectivity Cellular
1

Hi all,

I have a similar issue to this previous post where the Boron will only connect to cellular when connected to my computer via USB (power + data), except when I use only a USB power cable (no data) the Boron only flashes green.

What works:

  • Connect Boron via USB to computer
  • Boron boots and connects to cloud normally
  • I'm able to see the Boron in Particle Console and see Log messages over serial
  • Device OS 4.2.0 with internal SIM

What doesn't work:

  • Connect Boron via USB to computer using power cable only, or connect Boron via USB to a 5V USB power supply
  • Boron light briefly illuminates white, then immediately starts flashing green. Every ~40 green light flashes, Boron briefly illuminates white, then resumes green flashing

Edit: Boron LTE-M BRN404X with no LiPo

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  • Which Boron (LTE or 2G/3G)?
  • Are you using the LiPo battery?

If you are using the 2G/3G without a battery you will need to change some power manager settings. In the absence of a USB host using DPDM (current negotiation) the input current limit will be set at either 100 mA or 500 mA, which will not be sufficient to connect to cellular.

3

Sorry just added the info. Boron LTE BRN404X with no LiPo.

I resolved this issue - the Boron seems to get stuck in the "searching for internet" mode (flashing green) when insufficient power is provided.

I had other devices connected to the Boron Vin bus which can demand more than 0.5A at times. My computer USB-C port could provide this, but the other USB-A ports could not. So the Boron was stuck flashing green. I verified this with a bench power supply current limit.

Thanks for your input!

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