Table 15. Vddmmc Hardware Configuration For '1.8V / 3.3V' Function (Sdio2); Figure 18. 3V3_Sw_Sw_Enable And 1V8_Sw_Enable Mfx Schematic - ST STM32H7B3I-EVAL User Manual

For SD card 2 (SDIO2) interface, in order to control independently 1V8_SW, 3V3_SW, and VDDMMC, it is
necessary to control following GPIOs with software:
• SD_LDO_SEL (PG6)
• 3V3_SW_ENABLE (MFX IO0)
• 1V8_SW_ENABLE (MFX IO8)
And the user must follow the hardware configuration described in
1. The default setting is in bold.
2. PB8 signal is supplied by VDDMMC. Make sure to supply 3.3V on VDDMMC (Refer to
Make sure to take into account schematics below
• DNF means that the component is not fitted by default on the board.
Schematics for 3V3_SW, 1V8_SW, and VDDMMC
Figure 18.
UM2662 - Rev 1
Table 15. VDDMMC hardware configuration for '1.8V / 3.3V' function (SDIO2)
Signal name
OCSPI1_NCS (PG6)
3V3_SW_ENABLE (MFX IO0)
1V8_SW_ENABLE (MFX IO8)
3V3_SW_SW_ENABLE and 1V8_SW_ENABLE MFX schematic (Page 2)
Table 15.
Setting
JP23
SB34
SB29
(Figure 18, Figure 19, Figure
UM2662
Power supply
VDDMMC configuration (1)
[2-3]
(2)
ON
(2)
ON
Section 6.3.5 ).
20, and Figure 21).
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