I’m having intermittent issues with a Boron that’s being controlled through the ~EN pin. It works fine for hours, then at some point will simply stop responding/won’t boot up, even if I toggle ~EN manually. At that point, it is completely unresponsive, no LED, no reaction to manually hitting the r…

Well, the Boron’s 3v3 out pin isn’t actually connected to anything and the only thing still held high (other than the actual power inputs) are 2 DIO pins–and they’re both configured as inputs prior to ~EN going low.

This issue is intermittent and happens on a couple of my test devices, whereas others never seem to experience it (I have a Boron that’s been running for 10 days without issue, and another that can’t seem to get through the night). The external ~EN manager now has a watchdog that toggles the pin lo…

Additional info about the setup… I’ve got an ATTiny841 running on an external 3v3 supply, acting as the power/sleep manager (bringing ~EN down) and an I2C slave to the Boron. At the end of a wake/sense/publish cycle, the Boron requests a shutdown for X seconds from the power manager slave. Should…

I did not see if the Borons are LTE or 2G3G and how are they powered? Could it be that the enable pin is working, but the starting up sometimes fails due to peaks in power need, when Boron and external devices power up?

Any news on this? I'm pretty sure I'm having same problem... [image] Boron does not power on in high charge state..? Firmware We’re still having this issue. I’m wondering if it could be a problem with the pmic communication… when we see this issue, the enable pin is 3.3, a…

I’ve got this same issue. Most of the time the EN pin can reset the Boron and the Boron will come back to life, but other times it does not work and I end up in a scenario where EN is pulled high, there is 3v3 power, but the device’s LED and nRF do not come on. @psychogenic – we’ve got a very simil…

Just wanted to follow up on my last post. We found root cause on our PCB – a digital input circuit with a strong pullup was backfeeding power to the Boron during EN power cycles, which caused it to get stuck stuck in this state. Our fix for this was to disable the pullup before power cycling using …

[image] hwestbrook: Our fix for this was to disable the pullup before power cycling using EN. Would you be able to provide more details around this? Are your pull-up resisters your I2C 4.7K pullup resisters enabled via a GPIO pin and you simply turn it off before any type of EN reset occurs? …

Our backfeed problem was not from I2C pullups. It was from a digital input that allowed for significantly more current. When we redo this circuit, I will change it to a circuit whereby we can cut power to both the VIN and LI pins of the boron. We won’t use the EN pin as a watchdog because I’m not s…

Locked up Boron, ignores ~EN pin: how can this happen?

Troubleshooting

ccunningham January 20, 2020, 8:35pm 8

Any news on this? I'm pretty sure I'm having same problem...

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Locked up Boron, ignores ~EN pin: how can this happen?

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