STM32WLE4JC datasheet(19/146 Pages) STMICROELECTRONICS

19 / 146 page

DS13105 Rev 9

19/146

STM32WLE5/E4xx

Functional overview

The sub-GHz radio consists of:

•

an analog front-end transceiver, capable of outputting up to + 15 dBm maximum power

on its RFO_LP pin and up to + 22 dBm maximum power on RFO_HP pin

•

a digital modem bank providing the following modulation schemes:

–

LoRa Rx/Tx with bandwidth (BW) from 7.8 - 500 kHz, spreading factor (SF)

5 - 12, bit rate (BR) from 0.013 to 17.4 Kbit/s (real bitrate)

–

FSK and GFSK Rx/Tx with BR from 0.6 to 300 Kbit/s

–

(G)MSK Tx with BR from 0.1 to 10 Kbit/s

–

BPSK and DBPSK TX only with bitrate for 100 and 600 bit/s

•

a digital control including all data processing and sub-GHz radio configuration control

•

a high-speed clock generation

3.8.2

Sub-GHz radio 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 2. Sub-GHz radio system block diagram

3.8.3

Transmitter

The transmit chain comprises the modulated output from the modem, that directly

modulates the RF-PLL. An optional pre-filtering of the bit stream can be enabled to reduce

the power in the adjacent channel also dependent on the selected modulation scheme. The

modulated signal from the RF-PLL directly drives the high output power PA (HP PA) or low

output power PA (LP PA). The transmitted packet payload size depends on the modulation

scheme.

Transmitter high output power

Transmit high output power up to + 22 dBm, is supported through the RFO_HP RF pin.

MSv62615V1

Note: LoRa modem is only available on STM32WLE5xx devices.

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

VR_PA

VDDPA

PB0_VDDTCXO

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