rampadc 29 Posted June 19, 2014 Share Posted June 19, 2014 After my ThinkPad keyboard project, I had surplus stock of F5502 QFN-48 chips, also because Element14 is having them on sale, so I made some breakout boards for them. I can't remember where I got the inspiration for the port and pins numbering from but I'm sure it was on this forum a few years ago. It should fit on a small breadboard though I haven't tested it yet. The boards include a BSL button as well as SBW lines (RTVG for Reset, Test, VCC, GND lines). Rev. 1 Gerbers Boards (DirtyPCBs sent me 20 boards of the design on the left so no resonators) Rev. 2 - Include resonator, crystal + caps on 1 PCB and layout of via holes moved so it won't interfere with the silkscreen, width of board reduced Front, Back renders Quote Link to post Share on other sites
jazz 209 Posted June 20, 2014 Share Posted June 20, 2014 Something like this... http://rev0proto.com/wiki/index.php/MSP430F5510 Quote Link to post Share on other sites
rampadc 29 Posted June 20, 2014 Author Share Posted June 20, 2014 Yup... and that one looks a lot better too. Regarding DVCC, AVCC, do you know why there are so many capacitors between them? (Schematic from the page) reaper7 1 Quote Link to post Share on other sites
tingo 22 Posted June 22, 2014 Share Posted June 22, 2014 @@rampadc Thinkpad keyboard project? That sounds interesting. Any pointers to it? Quote Link to post Share on other sites
rampadc 29 Posted June 22, 2014 Author Share Posted June 22, 2014 @@rampadc Thinkpad keyboard project? That sounds interesting. Any pointers to it? Here you go: http://flashandrc.wordpress.com/2014/06/07/thinkpad-keyboard-project-its-over/ and http://www.instructables.com/id/A-Better-ThinkPad-USB-Keyboard-Adapter/?ALLSTEPS. And RobG helped me with the caps questions so no worries. tingo 1 Quote Link to post Share on other sites
jpnorair 340 Posted June 22, 2014 Share Posted June 22, 2014 BTW: I have a handful of MSP430F5503's in the QFN48... 50 I think. I'll sell the lot for $100 if you are interested. Regarding DVCC, AVCC, do you know why there are so many capacitors between them? (Schematic from the page) The best-practice here is to put a 100nF cap next to each Vcc pin to suppress voltage transients. You can additionally put the 4.7uF cap near any one of the Vcc input pins. Near AVcc, sometimes they like you to provide an additional capacitance for noise suppression. It should be near the AVcc pin. rampadc 1 Quote Link to post Share on other sites
rampadc 29 Posted June 22, 2014 Author Share Posted June 22, 2014 BTW: I have a handful of MSP430F5503's in the QFN48... 50 I think. I'll sell the lot for $100 if you are interested. That would be very cheap if it comes with free shipping . But no thanks, I'm running a bit short. Quote Link to post Share on other sites
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