You might find that the uC works without R1, C1, C2 but I suggest that you keep all three of them. C1 is required to ensure that RESET line goes high after Vcc > 1.8V. If you have a slow rising Vcc then there is a problem (but you might be ok with F1232 because it has an on-chip brownout ckt) I tried QFN soldering. Its painful but do-able. Did not solder the large square pad (NC) which is on the bottom of the chip.
-Sumukh --- stefan knorr <ste...@moontraveler.de> wrote: > 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 > > > ATTACHMENT part 2 image/gif name=msp430-h123-sch_small.gif ===== ******************************** Sumukh Pathare Email: sum...@ieee.org Phone: 781-856-2054 ********************************
