I'm using a serial qVGA graphic display that draws about 200+mA, the Netduino can draw a couple of hundred as well, sooner or later I often wonder if my issues with stuck deployment and general shakeyness could be lack of power.
Also my project behaves differently when running from a USB charger as opposed to connected to a PC. The timings appear to change on the UART which should be fixed surely or else it wouldn't work properly.
How much current can you draw from the 5v pin?
Started by DrJaymz, Mar 12 2012 10:39 PM
6 replies to this topic
#2
Stefan
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Posted 12 March 2012 - 11:05 PM
Hi DrJaymz,
Does this help?
http://forums.netdui...-5v-header-pin/
"Fact that I'm a moderator doesn't make me an expert in things." Stefan, the eternal newb!
My .NETMF projects: .NETMF Toolbox / Gadgeteer Light / Some PCB designs
My .NETMF projects: .NETMF Toolbox / Gadgeteer Light / Some PCB designs
#3
DrJaymz
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Posted 13 March 2012 - 08:24 PM
Hi DrJaymz,
Does this help?
http://forums.netdui...-5v-header-pin/
Well it states that the 5v regulator on board is good to 800mA we know that the controller uses about 250 so that leaves 550mA to stay in the current spec. So as long as the on board reg doesn't overheat we're good. The reg will shutdown in the event it gets too hot so it should be fine. perhaps my issues could be insufficient supply decoupling.
#4
Nathan Baker
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Posted 13 March 2012 - 08:56 PM
Also my project behaves differently when running from a USB charger as opposed to connected to a PC. The timings appear to change on the UART which should be fixed surely or else it wouldn't work properly.
Yes, pretty sure that could be a power issue.
I would not be comfortable with a constant 800mA draw, even if its not shutting down, I don't like my board to be getting so warm. This could cause the board to get quite warm. I like to power via 5V rail with either a PC power supply, or a similar stand alone supply, and only use the on-board regulator for small projects.Well it states that the 5v regulator on board is good to 800mA we know that the controller uses about 250 so that leaves 550mA to stay in the current spec. So as long as the on board reg doesn't overheat we're good. The reg will shutdown in the event it gets too hot so it should be fine. perhaps my issues could be insufficient supply decoupling.
#5
DrJaymz
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Posted 14 March 2012 - 07:20 PM
Yes, pretty sure that could be a power issue.
I would not be comfortable with a constant 800mA draw, even if its not shutting down, I don't like my board to be getting so warm. This could cause the board to get quite warm. I like to power via 5V rail with either a PC power supply, or a similar stand alone supply, and only use the on-board regulator for small projects.
It'll be fine, you worry too much, what could possibly go wrong....... (don't know why they worry at work when I say that)
#6
Nathan Baker
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Posted 15 March 2012 - 03:16 AM
Haha, well I guess its funny. I worry about my Netduino Plus ($50) getting too hot, but my dual nVidia GTX580 video cards ($500ea) I allow to run at 196 F....
Maybe I do worry too much, just had issues with my board being so hot i couldn't touch it, although I have no idea what my current draw was that time.
#7
Magpie
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Posted 15 March 2012 - 06:00 AM
Put one of your video card type heatsinks onto the netduinos voltage regulator chip, that should help.
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