2011/2/6 funlw65(Vasi) <[email protected]> > Start thinking what features will have a Jaluino board with > 18F47J53... (I would like to be able tu use RTC,, useful for a SD Card > logger).
18F27J53 has built-in RTC, this is one reason why I chose it (indeed for data logger, that's also why I wanted to put sd card if possible (microsd). > Then start cutting for a smaller board as Jaluino BEE (Pinout > is very important - where is possible). So, better to start with a > 10x10cm board ? ;) > OK I see what you mean, but I'm driven by costs. 10x10cm PCBs aren't that expensive, still twice the price as 5x5cm. Or, reading it on the other side, 5x5cm PCBs are very, very cheap. I hope to build a board for less than $10/$12, components + PCB all included. PS: btw note 18f47j53 is only available on QFN package. Much harder to solder, would require specific equipment. Cheers Seb > Vasi > > On Feb 6, 6:02 pm, Sebastien Lelong <[email protected]> > wrote: > > 18F27J53 has two MSSP modules. MSSP1 can be used for both I²C and SPI, > while > > MSSP2 can only be used for SPI. Since I want i²C, and SPI for embedded > > sd-card, I²C must use RB4 and RB5 pins (pullups for SDA1 and SCL1). > > > > I thus need to use different pins for SPI. MSSP2 has remappable pins (RPn > > pins on datasheets, see screenshot). Interesting feature, I'm supposed to > > select whatever remappable pins needed for SPI... Need more thoughts, but > I > > think I'll remap them on RP2, RP11, RP12 and RP13. > > > > Datasheet reading......... > > > > [image: 18f27j53.png] > > > > Cheers, > > Seb > > > > 2011/2/6 Sebastien Lelong <[email protected]> > > > > > > > > > Hi Vasi, > > > > > 2011/2/6 funlw65(Vasi) <[email protected]> > > > > >> The board will be less general with the two 4k7 resistors on RB1-2... > > > > > Arf... These were supposed to be I²C pull-up resistors, but they aren't > > > connected to the correct pins ! Nice catch, thanks, I'll fix this asap > ! If > > > you don't want this feature, just don't solder resistors, that's the > idea. > > > > > BTW I tried to move traces and add more spaces as you suggested. I'll > post > > > the result soon. > > > > > cheers, > > > Seb > > > > -- > > Sébastien Lelonghttp://www.sirloon.nethttp://sirbot.org > > > > 18f27j53.png > > 56KViewDownload > > -- > You received this message because you are subscribed to the Google Groups > "jallib" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/jallib?hl=en. > > -- Sébastien Lelong http://www.sirloon.net http://sirbot.org -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
