Bluepill: max. voltage on 5V pin?

Generic boards that are not Maple or Maple mini clones, and don't contain the additional USB reset hardware
ag123
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Re: Bluepill: max. voltage on 5V pin?

Post by ag123 » Sat Dec 16, 2017 3:08 am

well you could get a Baite MM clone instead of BP
https://www.aliexpress.com/store/produc ... 46722.html
https://www.ebay.com/sch/i.html?_nkw=st ... i&_sacat=0

that uses AMS1117 with a max 15V given in the spec and accordingly it can deliver up to 1A downstream
http://www.advanced-monolithic.com/pdf/ds1117.pdf

but i'd think sinking 12v to 5v, there'd be a lot of waste heat, it would run hot as well given the high voltage drop and you'd still need to find a way to do some heat sink

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BennehBoy
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Re: Bluepill: max. voltage on 5V pin?

Post by BennehBoy » Sun Dec 17, 2017 11:30 am

One of my Baite clones emitted magic smoke when its owner inadvertently connected it directly to a 12+V automotive feed. It's now eking out a lonely existence at a landfill somewhere so I'm unable to check the regulator markings.
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ag123
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Joined: Thu Jul 21, 2016 4:24 pm

Re: Bluepill: max. voltage on 5V pin?

Post by ag123 » Mon Dec 18, 2017 3:27 pm

uh oh, thanks for posting that, it's probably pretty good warning ;)
my guess is to feed off 12v, it would probably be better, safer, more efficient to feed off a low cost step down buck converter
https://en.wikipedia.org/wiki/Buck_converter
https://www.ebay.com/sch/i.html?_nkw=bu ... r&_sacat=0
pretty much an overkill as a buck converter typically supply much higher currents downstream, but when loads is light it could consume much less as well and possibly run cool, the capacitors could be smaller too

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mrburnette
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Re: Bluepill: max. voltage on 5V pin?

Post by mrburnette » Mon Dec 18, 2017 3:31 pm

BennehBoy wrote:
Sun Dec 17, 2017 11:30 am
One of my Baite clones emitted magic smoke when its owner inadvertently connected it directly to a 12+V automotive feed. It's now eking out a lonely existence at a landfill somewhere so I'm unable to check the regulator markings.
Spew Alert to others ... do not drink coffee while reading the above ... :lol:

Ray

zmemw16
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Re: Bluepill: max. voltage on 5V pin?

Post by zmemw16 » Mon Dec 18, 2017 7:23 pm

BennehBoy wrote:
Sun Dec 17, 2017 11:30 am
One of my Baite clones emitted magic smoke when its owner inadvertently connected it directly to a 12+V automotive feed. It's now eking out a lonely existence at a landfill somewhere so I'm unable to check the regulator markings.
best post of 2017 ?
should there be a competition ? new thread?
srp

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