Datasheet
DocID022152 Rev 8 77/202
STM32F405xx, STM32F407xx Electrical characteristics
5.1.6 Power supply scheme
Figure 21. Power supply scheme
1. Each power supply pair 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 the good functionality
of the device.
2. To connect BYPASS_REG and PDR_ON pins, refer to Section 2.2.16: Voltage regulator and Table 2.2.15: Power supply
supervisor.
3. The two 2.2 µF ceramic capacitors should be replaced by two 100 nF decoupling capacitors when the voltage regulator is
OFF.
4. The 4.7 µF ceramic capacitor must be connected to one of the V
DD
pin.
5. V
DDA
=V
DD
and V
SSA
=V
SS
.
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