Datasheet

Electrical characteristics STM32F20xxx
70/184 DS6329 Rev 16
6.1.6 Power supply scheme
Figure 19. 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 REGOFF and IRROFF pins, refer to Section 3.16: Voltage regulator.
3. The two 2.2 µF ceramic capacitors must 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.
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 device operation. It
is not recommended to remove filtering capacitors to reduce PCB size or cost. This might
cause incorrect device operation.
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