ST STM32WL55JC Reference Manual page 227

RM0453
The independent supply V
electrical isolation is applied to ignore any information coming from the peripherals supplied
by these dedicated supplies:
•
If V
DDA
without enabling any peripheral voltage monitoring.
•
If V
DDA
enabled to confirm whether the V
The following sequence must be applied before using any of these analog peripherals:
ADC, DAC, comparators or voltage reference buffer:
1. If V
DDA
a)
b)
c)
d)
2. Enable the analog peripheral. This automatically removes the V
6.2.4 Radio end of life (EOL)
The radio end-of-life monitor provides information on the V
operate the sub-GHz radio. When reaching the EOL level, the software must stop all radio
activity in a safe way.
The EOL is enabled by setting the RFEOLEN bit.
A RFEOLF flag is available in
level is below the EOL threshold.
The EOL is only generated when the sub-GHz radio is in Calibrate, Standby or Active mode.
6.3 Radio busy management
For correct software handling of the radio busy signal RFBUSY, additional busy control are
included in the PWR controller. This generates a busy mask RFBUSYMS status based on
DDA
is shorted externally to V
is independent from V
is independent from V
Enable PVM3 by setting PVME3 bit in the
Wait for the PVM3 wakeup time.
Wait until PVMO3 is cleared in the
Disable the PVM3 for consumption saving (optional).
Power status register 2 (PWR_SR2)
V
DD
V
EOLH
RFEOLF
is not considered as present by default and a logical and
, the application must assume that V
DD
, the peripheral voltage monitoring (PVM) can be
DD
supply is present or not.
DDA
:
DD
PWR control register 2
Power status register 2
Figure 22. EOL thresholds
hysteresis
RM0453 Rev 2
Power control (PWR)
is available
DDA
(PWR_CR2).
(PWR_SR2).
isolation.
DDA
supply when it is too low to
DD
to indicate if V
V
EOLL
voltage
DD
t
MSv62619V1
227/1454
275