RM0440 Rev 4 237/2126
RM0440 Power control (PWR)
271
Figure 14. PVD thresholds
6.2.3 Peripheral Voltage Monitoring (PVM)
Only V
DD
is monitored by default, as it is the only supply required for all system-related
functions. The V
DDA
can be independent from V
DD
and can be monitored with two
peripheral voltage monitoring (PVM).
Each of the four PVMx (x=1, 2) is a comparator between a fixed threshold VPVMx and the
V
DDA
power supply. PVMOx flags indicate if the independent power supply is higher or
lower than the PVMx threshold: PVMOx flag is cleared when the supply voltage is above the
PVMx threshold, and is set when the supply voltage is below the PVMx threshold.
Each PVM output is connected to an EXTI line and can generate an interrupt if enabled
through the EXTI registers. The PVMx output interrupt is generated when the independent
power supply drops below the PVMx threshold and/or when it rises above the PVMx
threshold, depending on EXTI line rising/falling edge configuration.
Each PVM can remain active in Stop 0 and Stop 1 modes, and the PVM interrupt can wake
up from the Stop mode.
The independent analog supply V
DDA
is not considered as present by default, and a logical
and electrical isolation is applied to ignore any information coming from the peripherals
supplied by this dedicated supply.
• If V
DDA
is shorted externally to V
DD
, the application should assume it is available
without enabling any Peripheral Voltage Monitoring.
• If V
DDA
is independent from V
DD
, the Peripheral Voltage Monitoring (PVM) can be
enabled to confirm whether the supply is present or not.
PVD output
V threshold
PVD
V
DD
100 mV
hysteresis
MS31445V2
Table 39. PVM features
PVM Power supply PVM threshold EXTI line
PVM1 V
DDA
V
PVM1
(around 1.65 V) 40
PVM2 V
DDA
V
PVM2
(around 1.8 V) 41
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