SDIO (Secure Digital Input/Output) uses the same physical SD card connector to interface peripheral devices such as Wi-Fi modules, GPS receivers, Bluetooth adapters, and cameras in embedded systems.
| Pin | Name | Function | Type |
|---|---|---|---|
| 1 | DAT3 | Data 3 or SDIO interrupt | I/O |
| 2 | CMD | Command or SDIO data | BUS |
| 3 | VSS | Ground | GND |
| 4 | VDD | Supply 3.3V | PWR |
| 5 | CLK | Clock | BUS |
| 6 | VSS | Ground | GND |
| 7 | DAT0 | Data 0 | BUS |
| 8 | DAT1 | Data 1 or SDIO interrupt | BUS |
| 9 | DAT2 | Data 2 | BUS |