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SD card to PIC controller

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stoyanoff

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Hi! I want to connect 18F66J60(3.3V Vcc) to SD card.
I want to be sure my chart is OK. So here are the connections:
PIN 1 of the SD card is connected to PIN 33(RC2/CS) of the 18F66J60
PIN 2 ----- --- to PIN 36(RC5/SDO)
PIN 3 ---- --- to GRD
PIN 4 ---- ---- to Vcc
PIN 5 ---- --- to PIN 34(RC3/SCK)
PIN 6 ---- ---- to GRD
PIN 7 ---- ---- to PIN 35(RC4/SDI)
PIN 8 and 9 through pull-up resistor(10k) to Vcc
PINs 1,2,5,7 have pull-up resistors, too.
Is everything OK??
 

Have a look at the schematic below:-

SD Card.PNG

If your controller operates on 3.3 V then there is no need to use the voltage divided and if it works on 5V then you have to put that voltage divided in between the SD Card and Controller and also make sure that, Voltage on SD Card doesn't exceed the 3.3V because it can damage your card.
 

OK! My controller is running on 3.3V. Do I need pull-up or pull-down resistors on the comunication pins???
 

stoyanoff said:
OK! My controller is running on 3.3V. Do I need pull-up or pull-down resistors on the comunication pins???
Click to expand...

No it is not required....
In SPI communication, there is no need for pull ups..
While in I2C you need pull ups..
 

I have this book.
First I tried to work with the card with CCS complier program - without any success. So I switch to mplab C18 and I`m following this book. I can`t adjust the standard demo to work with my controller. I`m following the steps from the book, but ....
I want to be sure, my hardware is OK and to start looking for the error in the program.
 

In SD mode, pull-up resistors are assumed because all communication lines are bidirectional. In SPI mode, you can omit pull-ups for lines, that are permanently driven from the host.

The SD card specification say explicitely that reserved lines (unused communication lines) should be connected to pull-uo resistors in SPI mode. Ignoring this point can cause excessive current consumption, but unlikely communication failure.
 

Hello,

Since you have 9 pins on SD card you don't use microSD card. If you use this PIC:


than you done job good. Dont forget to put some filter capacitors. You don't need any pull-ups.
 

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