Micro SD SPI or SDIO Card Breakout Board - 3V ONLY!

MicroSD card breakout supporting SPI or SDIO, 3 V logic only. Level shift before pairing with a 5 V host. Used for image, audio, and sensor-log storage on microcontrollers.

3V
3.3 V power input for the microSD card breakout; Adafruit warns that 5 V or VBAT will damage the card.
Type · powerVoltage · 3.3V only
GND
Common ground for power and logic.
Type · groundVoltage · 0V
DET
Card-detect signal; connected to GND internally when no card is inserted and pulled up to 3V through 4.7 kΩ when a card is inserted.
Type · digitalVoltage · 3V logic
CLK / SCK
SPI clock input to the SD card.
Type · spiVoltage · 3V logic
SO / MISO
SPI serial data out from the SD card to the microcontroller.
Type · spiVoltage · 3V logic
SI / MOSI
SPI serial data input from the microcontroller to the SD card.
Type · spiVoltage · 3V logic only
CS
SPI chip-select input; pull low to start an SPI transaction.
Type · spiVoltage · 3V logic only
CMD
SDIO bidirectional command/information signal between microcontroller and SD card.
Type · sdioVoltage · 3V logic
D0
SDIO bidirectional data line; Adafruit identifies the silkscreen legend as D0.
Type · sdioVoltage · 3V logic
D1
SDIO bidirectional data line; Adafruit identifies the silkscreen legend as D1.
Type · sdioVoltage · 3V logic
DAT2
SDIO bidirectional data line; Adafruit identifies the silkscreen legend as DAT2.
Type · sdioVoltage · 3V logic
D3
SDIO bidirectional data line; Adafruit identifies the silkscreen legend as D3.
Type · sdioVoltage · 3V logic

Pin	Type	Function	Voltage
3V	power	3.3 V power input for the microSD card breakout; Adafruit warns that 5 V or VBAT will damage the card.	3.3V only
GND	ground	Common ground for power and logic.	0V
DET	digital	Card-detect signal; connected to GND internally when no card is inserted and pulled up to 3V through 4.7 kΩ when a card is inserted.	3V logic
CLK / SCK	spi	SPI clock input to the SD card.	3V logic
SO / MISO	spi	SPI serial data out from the SD card to the microcontroller.	3V logic
SI / MOSI	spi	SPI serial data input from the microcontroller to the SD card.	3V logic only
CS	spi	SPI chip-select input; pull low to start an SPI transaction.	3V logic only
CMD	sdio	SDIO bidirectional command/information signal between microcontroller and SD card.	3V logic
D0	sdio	SDIO bidirectional data line; Adafruit identifies the silkscreen legend as D0.	3V logic
D1	sdio	SDIO bidirectional data line; Adafruit identifies the silkscreen legend as D1.	3V logic
DAT2	sdio	SDIO bidirectional data line; Adafruit identifies the silkscreen legend as DAT2.	3V logic
D3	sdio	SDIO bidirectional data line; Adafruit identifies the silkscreen legend as D3.	3V logic

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