microSD Card Interface
Standard 8-pin microSD memory card interface supporting SDIO 4-bit parallel bus mode and 1-bit SPI serial bus mode for microcontrollers and embedded systems.
Aliase:Micro SD, MicroSD, Micro-SD, TF Card, TransFlash, microSDHC, microSDXC, MicroSD Card, Micro SD Slot
microSD Card (Card Pinout)
8 Pins
Pin-Tabelle8
| Pin | Signal / Name | Typ | Alternative Funktionen |
|---|---|---|---|
| 1 | DAT2 | Digital | Data Line 2 (SDIO Mode)Reserved (SPI Mode) |
| 2 | CD/DAT3 | Digital | Card Detect / Data Line 3 (SDIO Mode)Chip Select — Active Low (SPI Mode) |
| 3 | CMD | Digital | Command / Response (SDIO Mode)Data In / MOSI (SPI Mode) |
| 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 | VSS | Ground | Supply Voltage Ground |
| 7 | DAT0 | Digital | Data Line 0 (SDIO Mode)Data Out / MISO (SPI Mode) |
| 8 | DAT1 | Digital | Data Line 1 (SDIO Mode)Reserved (SPI Mode) |
microSD Card Socket (Host Pinout)
9 Pins
Pin-Tabelle9
| Pin | Signal / Name | Typ | Alternative Funktionen |
|---|---|---|---|
| 1 | DAT2 | Digital | Data Line 2 (SDIO Mode)Reserved (SPI Mode) |
| 2 | CD/DAT3 | Digital | Card Detect / Data Line 3 (SDIO Mode)Chip Select — Active Low (SPI Mode) |
| 3 | CMD | Digital | Command / Response (SDIO Mode)Data In / MOSI (SPI Mode) |
| 4 | VDD | Power | Supply Voltage 3.3V |
| 5 | CLK | Digital | Clock Signal (SDIO Mode)Serial Clock / SCK (SPI Mode) |
| 6 | VSS | Ground | Supply Voltage Ground |
| 7 | DAT0 | Digital | Data Line 0 (SDIO Mode)Data Out / MISO (SPI Mode) |
| 8 | DAT1 | Digital | Data Line 1 (SDIO Mode)Reserved (SPI Mode) |
| CD | CD | Digital | Card Detect Switch Terminal — shorts to GND when card inserted |