> 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.
I think it will fit in 5x5cm with SD card but no XBEE:
http://www.adelaida.ro/product_info.php?products_id=11928&osCsid=037c0dd113d36e13790d335451ccfb12
but...
>
> PS: btw note 18f47j53 is only available on QFN package. Much harder to
> solder, would require specific equipment.
only with 18F46J50 then :(
>
> 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
>
> > --
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>
> --
> Sébastien Lelonghttp://www.sirloon.nethttp://sirbot.org
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