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G2553 28pin Prototyping?

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So this is mostly for RobG since he inspired it... I'm open to some suggestions for improvements/changes. I plan on ordering this next week as I have 2 chips for it.. third will get mailed to RobG if

The etchant gets under the sharp corners easier and causes bad etching.   I don't really think it is a(ny major) problem with professionally-made PCBs, but it is an issue when you cook Fe2O3 my butt

The other reason for using 45' angles on traces has to do with high speed signals. By high speed I mean really high speed.   So high, we will never see them on a LaunchPad board.   Still, it's goo

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ok... tried flashing the calibrations and that chip seems to be hosed now :(


Should I not break the xin/xout pins out? Would that be the culprit for bad interaction with the xtal?



Looks awesome! Bravo! Are these the ten for $10 50x50mm boards from Seeed (about $13 including shipping) ?



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ok... tried flashing the calibrations and that chip seems to be hosed now :(


Wait a minute. The '2553 already has factory calibration values in flash for 1, 8, 12, and 16 MHz. Why did you try to flash new values?

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Yes, I should not have broken out the xin/xout... After testing it with both of the boards I'm using I've figured that scraping and removing a peice (next to the pin) of the traces for those two will fix the problem... oh well. There was one lucky design bonus. Jack fits perfectly with LP mounted on top. Which makes the breakout going downard fit in a single breadboard row instead of crossing over and spanning two of them. (Just gotta remember to not power both on accident this way, lol)







And if you didn't notice the boards have 90

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The etchant gets under the sharp corners easier and causes bad etching.

I thought it was for an electric-related issue. maybe electrons don't know how to turn sharp corners... :)

Here it is an explanation I've found(it comes from TI)"


Just to elaborate on this...


I recently finished designing my first PCB from the ground up at my internship and encountered the right angle trace problem. After talking to my PCB manufacturer I found that the main reason that right angle traces are not used is that they start to resemble antennas. They aren't very good antennas (Better than 45 degree angle traces) but they are antennas. They start to radiate badly with fast rise time pulses (Independant of frequency). This leads to leaking radiation to the surrounding environment and to other traces. Since antennas receive just as well as they radiate it also adds to the noise susceptibility of its own trace.

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So a maze-like board with many pointless right angles could potentially be used for signal jamming?


Essentially yes, a jammer is basically an antenna that radiates at the same frequency band as the device it is trying to disrupt thus lowering the signal-to-noise ratio.

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