3.2.6.3 SDMMC1 Card Connector (J14)
A microSD card connector, connected to SDMMC1, is mounted on the top side of the baseboard. The SDMMC1 communication is based on a 6-pin interface (clock, command and four data). A card detection switch is included. The microSD connector can be used to connect any microSD card for mass storage.
The table below describes the pin assignment of microSD connector J14.
| Pin No | Mnemonic | PIO | Signal Description |
|---|---|---|---|
| 1 | SDMMC1_DAT2 | PA20 | Data bit 2 |
| 2 | SDMMC1_DAT3 | PA21 | Data bit 3 |
| 3 | SDMMC1_CDA | PA28 | Command |
| 4 | VCC | – | 3.3V supply voltage |
| 5 | SDMMC1_CK | PA22 | Clock |
| 6 | GND | – | Common ground |
| 7 | SDMMC1_DAT0 | PA18 | Data bit 0 |
| 8 | SDMMC1_DAT1 | PA19 | Data bit 1 |
| 9 | SW1 | GND | Ground |
| 10 | SDMMC1_CD | PA30 | Card detection switch |
| 11 | GND | – | Common ground |
| 12 | GND | – | Common ground |
| 13 | GND | – | Common ground |
| 14 | GND | – | Common ground |