STM32WLE4JC datasheet(19/145 Pages) STMICROELECTRONICS

19 / 145 page

DS13105 Rev 8

19/145

STM32WLE5/E4xx

Functional overview

3.8.2

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).

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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