Sub-Ghz Radio Functional Description; General Description; Sub-Ghz Radio Signals; Table 18. Sub-Ghz Internal Input/Output Signals - STMicroelectronics STM32WLEx Reference Manual

Sub-GHz radio (SUBGHZ)
4.3

Sub-GHz radio functional description

4.3.1

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.
PB0_VDDTCXO
4.3.2

Sub-GHz radio signals

The table below gives the list of sub-GHz radio signals.
Signal name
PB0_VDDTCXO
HSEBYPPWR
110/1306

Figure 5. Sub-GHz radio system block diagram

VDDPA
VR_PA
RFO_HP
RFO_LP
RFI_P
Sub-GHz
RF frontend
RFI_N
OSC_IN
HSE32
OSC_OUT
Note: LoRa modem is only available on STM32WLE5xx devices.

Table 18. Sub-GHz internal input/output signals

RFO_HP
RFO_LP
RFI_P
RFI_N
OSC_IN
OSC_OUT
VDDPA
VR_PA
hse32
HSEON
Sub-GHz radio
FSK
modem
Radio
control
LoRa
modem
(note)
Signal type
RF output Transmit high-power PA output
RF output Transmit low-power PA output
RF input Receiver differential P input
RF input Receiver differential N input
Analog input HSE32 oscillator input
Analog output HSE32 oscillator output
Supply Input supply for PA regulator
Supply Regulated PA supply output
Supply Regulated TCXO supply output
Digital output HSE32 clock signal to CPU
Digital input Enable HSE32 clock for CPU usage
Digital input Enable VDDTCXO regulator control
RM0461 Rev 5
SUBGHZSPI
BUSY
Interrups
Data
and HSEON
control
HSEBYPPWR
HSERDY
hse32
Description
RM0461
MSv62615V1