Electrical characteristics
6.1.6 Power supply scheme
Figure 18. Power supply scheme
STM32L412xx
VBAT
1.55 – 3.6 V
V
DD
Power switch
Backup circuitry
(LSE, RTC,
Backup registers)
V
CORE n x VDD n x 100 nF
+1 x 4.7 μF
GPIOs
Regulator
V
DDIO1
OUT
IN
IO logic
Kernel logic
(CPU, Digital
& Memories) n x VSS
10 nF
+1 μF
V
DDA
V
REF
VDDA
100 nF +1 μF
V
REF+
V
REF-
ADCs/
OPAMPs/
COMPs/
VSSA
MS49692V1
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.
74/192 DS12469 Rev 8
