Independent Sdmmc2 Supply For Stm32F767Xx/Stm32F777Xx And Stm32F72Xxx/Stm32F73Xxx Devices - ST STM32F7 Series Application Notes

AN4661
1.1.3 Independent SDMMC2 supply for STM32F767xx/STM32F777xx
and STM32F72xxx/STM32F73xxx devices
The V
DDSDMMC
PG9..12). It can be connected either to V
For example, when the device is powered at 1.8V, an independent power supply 3.3V can
be connected to V
supply, it is independent from V
and the first to disappear. The following V
•
During the power-on phase (V
V
DD
•
During the power-down phase (V
than V
•
The V
•
In the operating mode phase, V
associated GPIOs (PD6, PD7, PG9..12) powered by V
V
DDSDMMC_MIN
powered by V
is an independent power supply for SDMMC2 peripheral IOs (PD6, PD7,
. When the V
DDSDMMC
.
.
DD
rising and falling time rate specifications must be respected.
DDSDMMC
and V
DDSDMMC_MAX
are operating between V
DDSDMMC
Figure 3. V
DDSDMMC
DocID027559 Rev 5
or an external independent power supply.
DD
is connected to a separated power
DDSDMMC
and V but it must be the last supply to be provided
DD DDA
conditions must be respected:
DDSDMMC
< V ), V
DD DD_MIN DDSDMMC
< V ), V
DD DD_MIN
could be lower or higher than V
DDSDMMC
. If V
DDSDMMC
connected to external power supply
should be always lower than
should be always lower
DDSDMMC
are operating between
DDSDMMC
= V , the associated GPIOs
DD
and V .
DD_MIN DD_MAX
Power supplies
: the
DD
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