Datasheet

DocID028087 Rev 4 25/193
STM32F412xE/G Functional overview
42
it is independent from V
DD
or V
DDA
but it must be the last supply to be provided and the
first to disappear.
The following conditions VDDUSB must be respected:
– During power-on phase (V
DD
< V
DD_MIN
), V
DDUSB
should be always lower than
V
DD
– During power-down phase (V
DD
< V
DD_MIN
), V
DDUSB
should be always lower than
V
DD
–V
DDUSB
rising and falling time rate specifications must be respected.
– In operating mode phase, V
DDUSB
could be lower or higher than VDD:
– If USB is used, the associated GPIOs powered by V
DDUSB
are operating
between V
DDUSB_MIN
and V
DDUSB_MAX
.
– If USB is not used, the associated GPIOs powered by V
DDUSB
are operating
between V
DD_MIN
and V
DD_MAX
.
Figure 6. V
DDUSB
connected to an external independent power supply
069
9
''86%B0,1
9
''B0,1
WLPH
9
''86%B0$;
86% IXQFWLRQDODUHD
9
''
9
''$
86%QRQ
IXQFWLRQDO
DUHD
9
''86%
3RZHURQ
3RZHUGRZQ
2SHUDWLQJPRGH
86%QRQ
IXQFWLRQDO
DUHD
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.