SD Card Interface
Standard 9-pin full-size Secure Digital (SD/SDHC/SDXC) memory card interface and host socket supporting SDIO 4-bit parallel bus mode and 1-bit SPI serial bus mode with physical write-protect lock switch.
Aliase:SD Card, SD-Card, SDHC, SDXC, Fullsize SD, SD Slot, SD Socket, Secure Digital, SD Interface
SD Card (Card Pinout)
9 Pins
Pinout Table9
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | CD/DAT3 | Digital | Card Detect / Data Line 3 (SDIO Mode)Chip Select — Active Low (SPI Mode) |
| 2 | CMD | Digital | Command / Response (SDIO Mode)Data In / MOSI (SPI Mode) |
| 3 | VSS1 | Ground | Supply Voltage Ground 1 |
| 4 | VDD | Power | Supply Voltage (2.7V–3.6V, typ. 3.3V) |
| 5 | CLK | Digital | Clock Signal (SDIO Mode)Serial Clock / SCK (SPI Mode) |
| 6 | VSS2 | Ground | Supply Voltage Ground 2 |
| 7 | DAT0 | Digital | Data Line 0 (SDIO Mode)Data Out / MISO (SPI Mode) |
| 8 | DAT1 | Digital | Data Line 1 (SDIO Mode)Reserved (SPI Mode) |
| 9 | DAT2 | Digital | Data Line 2 (SDIO Mode)Reserved (SPI Mode) |
SD Card Socket (Host Pinout)
11 Pins
Pinout Table11
| Pin | Signal / Name | Type | Alternative Functions |
|---|---|---|---|
| 1 | CD/DAT3 | Digital | Card Detect / Data Line 3 (SDIO Mode)Chip Select — Active Low (SPI Mode) |
| 2 | CMD | Digital | Command / Response (SDIO Mode)Data In / MOSI (SPI Mode) |
| 3 | VSS1 | Ground | Supply Voltage Ground 1 |
| 4 | VDD | Power | Supply Voltage 3.3V |
| 5 | CLK | Digital | Clock Signal (SDIO Mode)Serial Clock / SCK (SPI Mode) |
| 6 | VSS2 | Ground | Supply Voltage Ground 2 |
| 7 | DAT0 | Digital | Data Line 0 (SDIO Mode)Data Out / MISO (SPI Mode) |
| 8 | DAT1 | Digital | Data Line 1 (SDIO Mode)Reserved (SPI Mode) |
| 9 | DAT2 | Digital | Data Line 2 (SDIO Mode)Reserved (SPI Mode) |
| WP | WP | Digital | Write Protect Switch Terminal — LOW when physical lock switch engaged |
| CD | CD | Digital | Card Detect Switch Terminal — shorts to GND when card inserted |