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Dangerous Prototypes

Other projects => Open Bench Logic Sniffer => Topic started by: stickben on January 16, 2013, 01:59:11 pm

Title: Board gets hot when I short inputs to ground
Post by: stickben on January 16, 2013, 01:59:11 pm
Just wondering if I am crazy, but it seems like something is trying to drive the unbuffered pins on my board.  I am trying to use RLE on group 0 and enable all groups for more time, but when I ground the unbuffered (group 2,3) pins to ground, the LDOs get hot and I still get noise on the inputs.  Is there something driving these pins?  I measured about 1.6 volts on all of them.

Help?
Title: Re: Board gets hot when I short inputs to ground
Post by: jadew on January 18, 2013, 06:58:18 am
It's normal to have some random voltage on them when they are floating, however if you want to see if they are driven, you'll have to measure the amps.
Title: Re: Board gets hot when I short inputs to ground
Post by: mkarlsson on May 04, 2015, 09:04:50 pm
Make sure the test mode check box is not set in the Capture->Acquisition popup menu.  In test mode the unbuffered pins are driven by a test pattern which can be feed back to the buffered inputs to verify the functionality of the board.
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