STMicroelectronics STM32F405

DocID018909 Rev 11 117/1731
RM0090 Power controller (PWR)
149
Figure 10. Power supply overview for STM32F42xxx and STM32F43xxx
1. V
DDA
and V
SSA
must be connected to V
DD
and V
SS
, respectively.
5.1.1 Independent A/D converter supply and reference voltage
To improve conversion accuracy, the ADC has an independent power supply which can be
separately filtered and shielded from noise on the PCB.
• The ADC voltage supply input is available on a separate V
DDA
pin.
• An isolated supply ground connection is provided on pin V
SSA
.
To ensure a better accuracy of low voltage inputs, the user can connect a separate external
reference voltage ADC input on V
REF
. The voltage on V
REF
ranges from 1.8 V to V
DDA
.
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