Power controller (PWR) RM0390
92/1328 RM0390 Rev 4
5 Power controller (PWR)
5.1 Power supplies
The device requires a 1.8 to 3.6 V operating voltage supply (V
DD
). An embedded linear
voltage regulator is used to supply the internal 1.2 V digital power.
The real-time clock (RTC), the RTC backup registers, and the backup SRAM (BKP SRAM)
can be powered from the V
BAT
voltage when the main V
DD
supply is powered off.
Note: Depending on the operating power supply range, some peripheral may be used with limited
functionality and performance. For more details refer to section “General operating
conditions” in STM32F446xx datasheet.
Figure 8. Power supply overview for STM32F446xx
1. V
DDA
and V
SSA
must be connected to V
DD
and V
SS
, respectively.
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