PIC SD FAT Schematic

zhiyongwoo · Joined: 18 Jul 2010 Posts: 9

Hi

I am new to CCS and recently I have a project that involved using SD card as my data logging storage device.

Because this project is actually my assignment and I need something to quickly to start with.

I have look at the EX_FAT.c example but the only thing I need is the schematic. As I am a student, I do not have the money to buy the board so I need to build my own board from my own PIC.

Can anyone kindly show me where can I get the relevant schematic so that I can skip unnecessary troubles.

Please help me here. Your help will be very appreciated!!

PCM programmer · Joined: 06 Sep 2003 Posts: 21708

asmallri has a schematic on his website that shows the connections to
an SD/MMC card socket. Look at the bottom of this schematic:
http://www.smallridge.com.au/download/BE_Reference_Design_PIC18F2620_ENC28J60.zip
It shows the circuits necessary to convert from the +3.3v logic levels used
by the SD/MMC card, to the +5v logic levels used by the PIC. The Vdd
voltage for the 74ACT125 is +5v.
But if you run the PIC with a Vdd voltage of +3.3v, then you don't need
the circuits to do level conversion.