6.3.5 Board power supply - VDDMMC
STM32H7B3I-EVAL can provide either 1.8 V or 3.3 V on VDDMMC power rail of the STM32H7B3LIH6QU
microcontroller.
Figure 17. MCU Power: VDDMMC
This power rail can be used in different configurations:
• Default configuration: VDDMMC is forced to 3.3V only.
• SDIO2 configuration: VDDMMC is switched from 3.3 V to 1.8 V if necessary, and it can be powered off.
Default configuration (VDDMMC = 3.3 V only)
Important:
Some pins from STM32H7B3LIH6QU are supplied by VDDMMC, but are '3.3V only' and not linked to SDIO2 (Refer to
Table 12)
Table 12. Pins supplied by VDDMMC but '3.3V only'
Pin name
Pin function
PB8 DCMI_D6 || MEMS_LED || MOTOR_DFSDM1_CKIN7
PB9 DCMI_D7 || DFSDM1_DATIN7
PD6 OCSPI1_IO6 || MOTOR_DFSDM1_CKIN4
PG9 DCMI_VSYNC/RDY
PG10 DCMI_D2 || FMC_NE3 || OCSPI2_IO6
PG11 DCMI_D3 || OCSPI2_IO7
PG12 OCSPI2_NCS
PG13 LED1
PG14 OCSPI1_IO7
UM2662
Power supply
UM2662 - Rev 1
page 23/95
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