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Power control (PWR)
RM0008
4.1.1
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 .
When available (according to package), V REF- must be tied to V SSA .
On 100-pin and 144- pin packages
To ensure a better accuracy on low voltage inputs, the user can connect a separate external
reference voltage ADC input on V REF+ and V REF- . The voltage on V REF+ can range from
2.4 V to V DDA .
On 64-pin packages
The V REF+ and V REF- pins are not available, they are internally connected to the ADC
voltage supply (V DDA ) and ground (V SSA ).
4.1.2
Battery backup domain
To retain the content of the Backup registers and supply the RTC function when V DD is
turned off, V BAT pin can be connected to an optional standby voltage supplied by a battery or
by another source.
The V BAT pin powers the RTC unit, the LSE oscillator and the PC13 to PC15 IOs, allowing
the RTC to operate even when the main digital supply (V DD ) is turned off. The switch to the
V BAT supply is controlled by the Power Down Reset embedded in the Reset block.
Warning:
During t RSTTEMPO (temporization at V DD startup) or after a PDR
is detected, the power switch between V BAT and V DD remains
connected to V BAT .
During the startup phase, if V DD is established in less than
t RSTTEMPO (Refer to the datasheet for the value of t RSTTEMPO )
and V DD > V BAT + 0.6 V, a current may be injected into V BAT
through an internal diode connected between V DD and the
power switch (V BAT ).
If the power supply/battery connected to the V BAT pin cannot
support this current injection, it is strongly recommended to
connect an external low-drop diode between this power
supply and the V BAT pin.
If no external battery is used in the application, it is recommended to connect V BAT
externally to V DD through a 100 nF external ceramic capacitor (for more details refer to
AN2586).
When the backup domain is supplied by V DD (analog switch connected to V DD ), the
following functions are available:
54/995
●
●
PC14 and PC15 can be used as either GPIO or LSE pins
PC13 can be used as GPIO, TAMPER pin, RTC Calibration Clock, RTC Alarm or
second output (refer to Section 5: Backup registers (BKP) on page 66 )
Doc ID 13902 Rev 9
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