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Connect sd card to pic18F ?!

 
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romaind35



Joined: 21 Apr 2009
Posts: 2

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Connect sd card to pic18F ?!
PostPosted: Tue Apr 21, 2009 6:13 am     Reply with quote
hello,
I would like to know how to connect my sd-card(16MB) connector has one pic18f2520 - 10Mhz - SPI mode
help me please !
sorry for my bad english but I am french.

this is my schema:

http://dl.free.fr/jco7YHGgL


thanks for help me.

Romain
asmallri



Joined: 12 Aug 2004
Posts: 1634
Location: Perth, Australia

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PostPosted: Tue Apr 21, 2009 10:29 pm     Reply with quote
I could not download your schematic because I could not understand the web page. However you will find examples of interfacing a PIC18F series PIC here: http://www.brushelectronics.com/index.php?page=projects

Common mistakes are forgetting to include a pull-up resistor on DO out from the card, incorrect level translation between the 5 volt pic and the 3.3 volt card, insufficient power supply to handle the transient (100mA+) draw from the 3.3 volt rail. You need filtering capacitors and power supply decoupling capacitors as close as practical to the card. I generally use a 22uF tantalum and 0.1uF ceramic for this purpose in addition to large capacitors before and after the regulators.

16MB is small for an SD card - are you sure it is not an MMC card?
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Regards, Andrew

http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!!
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