C1 and C2 are to keep noise off your Vcc and reset lines. If your really sure you wont have any noise (e.g. battery power in a metal box) you might be ok with out them.
I've had to do chips similar to the QFN but not quite as small. It's probably doable but I would not recommend it. If you're set on that package I would make your footprint large enough so your pads stick out a fair amount. This will make soldering easier for you. Also you can get .1uF caps in 0402 packages which are _really_ small so if you're avoiding using them because of space I would still recommend using them. If you're just trying to get a quick setup going you don't need any of those parts at all. Test can be pulled directly to Vss and reset pulled directly to Vcc. But it takes less time to solder 2 resistors and 2 caps then it does to trouble shoot your software _and_ hardware trying to figure out why it "randomly resets". The minimum required is nothing but a battery and the MSP. The minimum recommended is what's in that schematic. I hope I that's helpful to you :) -Chris Takahashi -----Original Message----- From: mspgcc-users-ad...@lists.sourceforge.net [mailto:mspgcc-users-ad...@lists.sourceforge.net] On Behalf Of stefan knorr Sent: Friday, August 27, 2004 1:25 PM To: mspgcc-users@lists.sourceforge.net Subject: [Mspgcc-users] really needed external components hi list, i'd like to know which parts are really needed to use the msp430f1232 in the programmed state, assuming the power supply is stable and no buffer caps are needed. the attached picture is part of the documentation from olimex. it shows the external parts of the header board for the msp430f1232. there are five components: - watch quarz (optional - not needed) - r1 (needed to hold 'test' down) - r2 (needed to hold 'reset' up) - c1 (??? - not needed) - c2 (??? - not needed) so what about c1 and c2. are they really needed? are two external resistors enough to use the controller? another question: does anyone have experiences in (hand-)soldering the tiny QFN packages? best regards, stefan
