8.3
CN4 microSD
™
card connector
microSD
™
cards with 4 GB or more capacity can be inserted in the receptacle CN4. Four data bits of the SDIO1
interface, CLK, and CMD signals of the STM32H7B3LIH6Q are used to communicate with the microSD
™
card.
The card insertion is detected by the μSD_Detect signal. When a microSD
™
card is inserted, the μSD_Detect
level is LOW, otherwise, it is HIGH.
Figure 18. CN4 microSD
™
card connector
Table 14. CN4 microSD
™
connector pinout
Pin number
Description Pin number Description
1 SDIO1_D2 (PC10) 6-9 GND
2 SDIO1_D3 (PC11) 7 SDIO1_D0 (PC8)
3 SDIO1_CMD (PD2) 8 SDIO1_D1 (PC9)
4 VDD (3V3) 10 μSD_Detect (PI8)
5 SDIO1_CK (PC12) 11-12-13-14 GND (casing)
UM2569
CN4 microSD™ card connector
UM2569 - Rev 6
page 26/53
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