Power control (PWR) RM0351
134/1693 DocID024597 Rev 3
When the VREF+ is double-bonded with VDDA in a package, the internal voltage
reference buffer is not available and must be kept disable (refer to datasheet for
packages pinout description).
V
REF-
must always be equal to V
SSA
.
An embedded linear voltage regulator is used to supply the internal digital power V
CORE
.
V
CORE
is the power supply for digital peripherals, SRAM1 and SRAM2. The Flash is
supplied by V
CORE
and V
DD
.
Figure 7. Power supply overview
5.1.1 Independent analog peripherals supply
To improve ADC and DAC conversion accuracy and to extend the supply flexibility, the
analog peripherals have an independent power supply which can be separately filtered and
shielded from noise on the PCB.
• The analog peripherals voltage supply input is available on a separate V
DDA
pin.
• An isolated supply ground connection is provided on V
SSA
pin.
The V
DDA
supply voltage can be different from V
DD
. The presence of V
DDA
must be checked
before enabling any of the analog peripherals supplied by V
DDA
(A/D converter, D/C
converter, comparators, operational amplifiers, voltage reference buffer).
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