RM0453 Rev 1 155/1461
RM0453 Sub-GHz radio (SUBGHZ)
218
5.3 Sub-GHz radio functional description
5.3.1 General description
The sub-GHz radio provides an internal processing unit to handle communication with the
system CPU. Communication is handled by commands sent over the SPI interface, and a
set of interrupts is used to signal events. BUSY information signals operation activity and is
used to indicate when the sub-GHz radio commands cannot be received.
The block diagram of the sub-GHz radio system is shown in the figure below.
Figure 9. sub-GHz radio system block diagram
5.3.2 Sub-GHz radio signals
The table below gives the list of sub-GHz radio signals.
MSv62614V1
Sub-GHz radio
Sub-GHz
RF frontend
Radio
control
SUBGHZSPI
hse32
Interrups
RFO_LP
RFO_HP
RFI_P
RFI_N
FSK
modem
LoRa
modem
(note)
Data
and
control
HSE32
OSC_IN
OSC_OUT
BUSY
HSERDY
HSEON
HSEBYPPWR
Note: LoRa modem is only available on STM32WL55xx devices.
VR_PA
VDDPA
PB0_VDDTCXO
Table 26. Sub-GHz internal input/output signals
Signal name Signal type Description
RFO_HP RF output Transmit high-power PA output
RFO_LP RF output Transmit low-power PA output
RFI_P RF input Receiver differential P input
RFI_N RF input Receiver differential N input
OSC_IN Analog input HSE32 oscillator input
OSC_OUT Analog output HSE32 oscillator output
VDDPA supply Input supply for PA regulator
VR_PA supply Regulated PA supply output
PB0_VDDTCXO supply Regulated TCXO supply output
hse32 Digital output HSE32 clock signal to CPU
HSEON Digital input
Enable HSE32 clock for CPU
usage
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