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max0412
Joined: 26 Oct 2003
Posts: 312
Helped: 31
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 05 Jan 2009 17:22 usb voltage pickit 2 |
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I'm not given an option thru windows to turn off the USB that the PICkit2 is connected to.
I think I may have fried one of my USB ports by just disconnecting the PICkit2 without first shutting it down.
Is there a way to shut down the USB port thru windows if windows doesn't automatically give you an option? With USB thumb drives windows will automatically give me an option to shut down the port before removal.For some reason when using the PICkit2 I'm not given safely remove hardware option.
I'm using XP home.
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btbass
Joined: 20 Jul 2001
Posts: 1187
Helped: 113
Location: Oberon
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05 Jan 2009 18:43 have i damaged my pickit 2 |
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USB is called hot plug and play interface. It is designed for devices being plugged in and unplugged without warning. You cant hurt it or the USB device. They are designed that way.
The only reason you get a warning for flash drives is because sometimes windows caches the files and doesnt write to them in real time. You can change the properties so it does write in real time. Then you can plug them in and out at will.
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05 Jan 2009 18:43 Ads |
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pranam77
Joined: 22 Apr 2008
Posts: 1071
Helped: 93
Location: Mangalore(India)
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06 Jan 2009 6:50 PICkit2 remove from USB? |
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Hai max0412
Check your USB port with any other device. If you have really damaged the port, there is something seriously wrong with your PICkit. USB ports can deliver upto 500 ma current without pain. PicKit just draws some fraction within that range.
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funnynypd
Joined: 09 May 2007
Posts: 918
Helped: 21
Location: USA & Canada
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09 Jan 2009 3:11 PICkit2 remove from USB? |
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This is strange. I plug and unplug my PICkit 2 all the time on desktops and laptops. And they seems very reliable.
Have you checked the following two:
1. Is you PC has a floating ground? Some time the PC case has high voltage.
2. Is you PICKIT 2 still function?
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max0412
Joined: 26 Oct 2003
Posts: 312
Helped: 31
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09 Jan 2009 13:27 Re: PICkit2 remove from USB? |
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I checked the USB now it's working. I don't know what happened I have lots of USB ports but only two are up front.
I thought I read something somewhere that USB ports can be fried by unplugging hot devices from Transient over voltages. I figured this is why windows offers the safely remove hardware option to shut the device off.
If there is current flow through the USB cable and you unplug it there will be a voltage spike due to inductance in the cable,but there should be TVS on USB ports to clamp them.
I don't think the PIKIT2 draws all that much current with no load though.
It was just weird.
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dsPIC24F
Joined: 04 Oct 2007
Posts: 66
Helped: 14
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12 Jan 2009 13:17 PICkit2 remove from USB? |
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| If you can, try to run a montherboard diagnostic and see if all USB port hardware is still health.
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