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.

Figure 3-16. SDMMC1 microSD
Figure 3-17. microSD Socket J14 Location

The table below describes the pin assignment of microSD connector J14.

Table 3-7. microSD Socket J14 Pin Assignment
Pin NoMnemonicPIOSignal Description
1SDMMC1_DAT2PA20Data bit 2
2SDMMC1_DAT3PA21Data bit 3
3SDMMC1_CDAPA28Command
4VCC–3.3V supply voltage
5SDMMC1_CKPA22Clock
6GND–Common ground
7SDMMC1_DAT0PA18Data bit 0
8SDMMC1_DAT1PA19Data bit 1
9SW1GNDGround
10SDMMC1_CDPA30Card detection switch
11GND–Common ground
12GND–Common ground
13GND–Common ground
14GND–Common ground