STMicroelectronics STM32WL5 Series - Figure 15. Sub-Ghz Radio Operating Modes

RM0453 Rev 5 171/1450
RM0453 Sub-GHz radio (SUBGHZ)
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– RC 64 kHz and timers can be kept running (optional)
– Optional registers and data memory retained
• Calibration mode
– intermediate mode between Deep-Sleep or Sleep, and Standby
– used to calibrate the sub-GHz radio RC 64 kHz, sub-GHz radio RC 13 MHz, RF-
PLL, RF-ADC and image
• Standby mode
– sub-GHz radio clocked by its internal RC 13 MHz clock
– HSE32 clock can be kept running (optional)
– data memory retained
• Active mode (FS, TX, RX)
– Frequency synthesis (FS) mode: RF-PLL switched on
– Transmit (TX) mode: the power amplifier (PA) ramped and data transmitted from
the data buffer according the selected modulation scheme
– Receive (RX) mode: sub-GHz radio looking for incoming data packets
The sub-GHz radio operating modes are shown in the figure below.
Figure 15. Sub-GHz radio operating modes
MSv62622V2
Active
Sleep
FS
TX
RX
POR and reset
Calibration
Standby
Startup
NSS or RF-RTC (cold)
NSS or RF-RTC (warm)
Calibration done
Set_Rx()
RxTimeout,
RxDone,
Set_Standby()
TxTimeout,
TxDone
Set_Fs()
Set_Standby()
Set_Fs()
Set_Tx()
Set_Rx()
Set_Sleep()
Set_Rx()
Set_Rx()
Set_Tx()
Set_Tx()
Set_Tx()
Set_Fs()