Datasheet

DocID027107 Rev 6 73/202
STM32F446xC/E Electrical characteristics
175
6.1.6 Power supply scheme
Figure 18. Power supply scheme
1. V
DDA
and V
SSA
must be connected to V
DD
and V
SS
, respectively.
2. V
DDUSB
is a dedicated independent USB power supply for the on-chip full-speed OTG PHY module and
associated DP/DM GPIOs. Its value is independent from the V
DD
and V
DDA
values, but must be the last
supply to be provided and the first to disappear. If V
DD
is different from V
DDUSB
and only one on-chip OTG
PHY is used, the second OTG PHY GPIOs (DP/DM) are still supplied at
VDDUSB
(3.3V).
3. V
DDUSB
is available only on WLCSP81, UFBGA144 and LQFP144 packages. For packages where V
DDUSB
pin is not available, it is internally connected to V
DD
.
4. V
CAP_2
pad is not available on LQFP64.
Caution: Each power supply pair (V
DD
/V
SS
, V
DDA
/V
SSA
...) must be decoupled with filtering ceramic
capacitors as shown above. These capacitors must be placed as close as possible to, or
below, the appropriate pins on the underside of the PCB to ensure good operation of the
device. It is not recommended to remove filtering capacitors to reduce PCB size or cost.
This might cause incorrect operation of the device.
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