ST STM32F7 Series User Manual

DocID027559 Rev 5 9/54
AN4661 Power supplies
53
1.1.3 Independent SDMMC2 supply for STM32F767xx/STM32F777xx
and STM32F72xxx/STM32F73xxx devices
The V
DDSDMMC
is an independent power supply for SDMMC2 peripheral IOs (PD6, PD7,
PG9..12). It can be connected either to V
DD
or an external independent power supply.
For example, when the device is powered at 1.8V, an independent power supply 3.3V can
be connected to V
DDSDMMC
. When the V
DDSDMMC
is connected to a separated power
supply, it is independent from V
DD
and V
DDA
but it must be the last supply to be provided
and the first to disappear. The following V
DDSDMMC
conditions must be respected:
• During the power-on phase (V
DD
< V
DD_MIN
), V
DDSDMMC
should be always lower than
V
DD
.
• During the power-down phase (V
DD
< V
DD_MIN
), V
DDSDMMC
should be always lower
than V
DD
.
• The V
DDSDMMC
rising and falling time rate specifications must be respected.
• In the operating mode phase, V
DDSDMMC
could be lower or higher than V
DD
: the
associated GPIOs (PD6, PD7, PG9..12) powered by V
DDSDMMC
are operating between
V
DDSDMMC_MIN
and V
DDSDMMC_MAX
. If V
DDSDMMC
= V
DD
, the associated GPIOs
powered by V
DDSDMMC
are operating between V
DD_MIN
and V
DD_MAX
.
Figure 3. V
DDSDMMC
connected to external power supply
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ST STM32F7 Series Specifications

General

Brand	ST
Model	STM32F7 Series
Category	Microcontrollers
Language	English