Power Pins

  • VIN - this is the power pin. Since the chip uses 3-5VDC you should pick whatever the logic voltage you're using. For most Arduino's that's 5V.
  • 3V3 - this is the 3.3V output from the voltage regulator, you can grab up to 100mA from this if you like
  • GND - common ground for power and logic

SPI Logic Pins

All pins are 3-5V compliant and use whatever logic level is on VIN

  • SCK - This is the SPI clock pin, it's an input to the chip
  • MISO - this is the Microcontroller In Serial Out pin, for data sent from the SD card to your processor
  • MOSI - this is the Microcontroller Out Serial In pin, for data sent from your processor to the SD card
  • CS - this is the chip select pin, drop it low to start an SPI transaction. It's an input to the chip

This guide was first published on Feb 02, 2021. It was last updated on Feb 02, 2021.

This page (Pinouts) was last updated on Apr 10, 2021.

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