# Brown-out & hard reset

**URL:** <https://discuss.blues.com/t/brown-out-hard-reset/3199>\
**Category:** Hardware\
**Created:** [July 28, 2025, 6:09pm UTC](https://discuss.blues.com/t/brown-out-hard-reset/3199 "2025-07-28T18:09:01Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![hgonz](https://avatars.discourse-cdn.com/v4/letter/h/439d5e/32.png) [@hgonz](https://discuss.blues.com/u/hgonz)\
**Post date:** [July 28, 2025, 6:09pm UTC](https://discuss.blues.com/t/brown-out-hard-reset/3199/1 "2025-07-28T18:09:01Z")

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Hello,

I’m using the Notecarrier-F with a Note-NBGLW.

Whenever I power up I get this sequence of events shown in Notehub:

\_session.qo  
{“closed”:true,“why”:“session closed because the notecard has opened a newer session”}

\_geolocate.qo  
{“country”:“CA”,“location”:“”,“radios”:{“wifi”:6}}

\_session.qo  
{“opened”:true,“why”:“first sync; continuous connection mode”}

\_health.qo  
{“text”:“boot (brown-out & hard reset [17281])”,“voltage”:4.6679688}

Should I be concerned about the brown-out & hard reset or is this normal? I’ve integrated this notecard on a custom PCB, and saw the same sequence. I thought it might have been a hardware issue on my PCB.

Thanks.

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**Author:** ![hgonz](https://avatars.discourse-cdn.com/v4/letter/h/439d5e/32.png) [@hgonz](https://discuss.blues.com/u/hgonz)\
**Post date:** [July 29, 2025, 12:34pm UTC](https://discuss.blues.com/t/brown-out-hard-reset/3199/2 "2025-07-29T12:34:10Z")

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I should add that my device works like I want it to after powering up. But I’m trying to debug this brown-out issue and can’t tell what causes it. I’ve added capacitors to the VIO\_P and MODEM\_P pins and don’t see any voltage drops on an oscilloscope.

Thanks!

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<div class="post-metadata">

**Author:** ![hgonz](https://avatars.discourse-cdn.com/v4/letter/h/439d5e/32.png) [@hgonz](https://discuss.blues.com/u/hgonz)\
**Post date:** [July 29, 2025, 3:00pm UTC](https://discuss.blues.com/t/brown-out-hard-reset/3199/3 "2025-07-29T15:00:53Z")

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I’ve noticed the brown-out & hard reset only happens in hub.set mode:continuous. I’ve changed to hub.set mode to minimum and there are no more brown-out messages. Is there an explanation for this?

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**Author:** ![RobLauer](https://sea2.discourse-cdn.com/flex020/user_avatar/discuss.blues.com/roblauer/32/1567_2.png) [@RobLauer](https://discuss.blues.com/u/RobLauer)\
**Post date:** [July 30, 2025, 4:49pm UTC](https://discuss.blues.com/t/brown-out-hard-reset/3199/4 "2025-07-30T16:49:22Z")

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Hi @hgonz and welcome to the Blues community!

Generally speaking, if you perform a hardware restart of the Notecard within 15 minutes of having been connected, you will see this “brown-out” message. It’s important to remember with the Notecard that it was built to remain powered on and connected to a battery indefinitely as there are non-trivial usages of [power](https://dev.blues.io/notecard/notecard-walkthrough/low-power-design/#power-usage-estimates) and [data](https://dev.blues.io/notecard/notecard-walkthrough/low-bandwidth-design/#data-usage-estimates) when cold booting (and Notecard idles incredibly low at 8-18uA).

There shouldn’t be a difference between continuous and minimum modes, as again this should only appear on restarts (or if your voltage really does drop too low to support your product).

Rob