Datasheet

DocID025644 Rev 3 57/135
STM32F401xD STM32F401xE Electrical characteristics
114
6.1.6 Power supply scheme
Figure 18. Power supply scheme
1. To connect PDR_ON pin, refer to Section 3.14: Power supply supervisor.
2. The 4.7 µF ceramic capacitor must be connected to one of the V
DD
pin.
3. V
CAP_2
pad is only available on LQFP100 and UFBGA100 packages.
4. V
DDA
=V
DD
and V
SSA
=V
SS
.
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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