Datasheet

DocID023353 Rev 7 55/133
STM32F303xB STM32F303xC Electrical characteristics
118
6.1.6 Power supply scheme
Figure 10. Power supply scheme
1. Dotted lines represent the internal connections on low pin count packages, joining the dedicated supply
pins.
Caution: Each power supply pair (V
DD
/V
SS
, V
DDA
/V
SSA
etc..) 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.
MS19875V3
Power switch
V
BAT
GP I/O s
OUT
IN
Kernel logic
(CPU,
Digital
& Memories)
Backup circuitry
(LSE,RTC,
Backup registers)
Wake-up logic
100 nF
+ 1 × 4.7 μF
1.65 - 3.6V
Regulator
V
DDA
V
SSA
ADC/
DAC
Level shifter
IO
Logic
V
DD
10 nF
+ 1 μF
V
DDA
V
REF+
V
REF-
V
DD
V
SS
4 ×
3 ×
V
REF
10 nF
+ 1 μF
4 ×
Analog: RCs, PLL,
comparators, OPAMP, ....