CC430F513* CLEARANCE ERRORS ON EAGLE

Question

Hi, I'm creating a PCB based on the CC430F5137 chip from Texas Instruments. I've routed all wires and whenever i run DRC I keep getting clearance errors between the smd footprints of the chip. How can i clear this errors? ps: The photo is a picture when running the DRC with all clearance settings at 0 mils 
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geralds · Accepted Answer

Hi,

ist seems that your drawings of the component is wrong.

http://www.ti.com/lit/ds/symlink/cc430f5137.pdf

clearance settings to 0 would be also wrong, minimum what the manufacture can do as well.

Eagle use default about 6mils. Some manufacture can handle about 4mils of clearance.

hm.. have you some lines or particles on the first layer that are not electrical?

That would also create an exception error.

Gerald

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rachaelp · Answer

I'm not sure what setting the clearances to 0mil on the "different nets" section is. For the same nets section it says it disables the check but it's clearly not doing this in the case of the different nets. I suspect setting 0mils is making EAGLE switch to some default value. As a test set your trace to trace, trace to pad, and pad to pad clearances to 6mil and see if the issue clears up. Looking at your first image 6mils should be less than the gaps you have. HOWEVER! What the DRC should be set to is the manufacturing capability of the manufacturer you plan to use for your PCB. Depending on who you use they may provide an EAGLE .dru file or alternatively you might have to dig through their specs and manually set up the DRC to their capabilities. If once you've done this you still have issues then it may be that you need to choose another manufacturer or speak to them to see if they are ok with a reduced clearance between pads and then either adjust the DRC accordingly (which will apply to the whole board) or approve the DRC errors around this specific IC. Best Regards, Rachael

CC430F513* CLEARANCE ERRORS ON EAGLE

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