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SD CARD SPI Schematic

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leomecma

leomecma

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sd card schematic

Anyone has an schematic for interface a SDCARD to a 3V3 microcontroller. I found some, and some people use pullup resistors, others not. Is it necessary? If is true, in what pin?

thk,

leomecma
 

sd card spi

Check Microchip website. There are many 3V3 MCUs support SPI interface. There is three wire connection between the MCU and SD card and no resisters needed.
 

sd card schematics

hi to all,
Pull up resistance is must in spi communication. So u put 10k in the Data in and data out Line
Thanks
chandravel
 

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