STM32WLE4JC datasheet(18/145 Pages) STMICROELECTRONICS

18 / 145 page

Functional overview

STM32WLE5/E4xx

18/145

DS13105 Rev 8

3.6

Security management

The devices contain many security blocks, such as:

•

RNG

•

AES: 128-and 256-bit AES, supporting ECB, CBC, CTR, GCM, GMAC and CCM

chaining modes

•

PKA:

–

modular arithmetic including exponentiation with maximum modulo size of

3136 bits

–

elliptic curves over prime field scalar multiplication, ECDSA signature, ECDSA

verification with maximum modulo size of 521 bits

•

cyclic redundancy check calculation unit (CRC)

3.7

Boot modes

At startup, BOOT0 pin and BOOT1 option bit are used to select one of the following boot

options:

•

Boot from user Flash memory

•

Boot from boot system memory (where embedded bootloader is located)

•

Boot from embedded SRAM

The bootloader makes possible to download code from USART or SPI.

3.8

Sub-GHz radio

3.8.1

Introduction

The sub-GHz radio is an ultra-low-power sub-GHz radio operating in the 150 - 960 MHz ISM

band. LoRa, (G)FSK/(G)MSK modulation in transmit and receive, and (D)BPSK in transmit

only, allow an optimal trade-off between range, data rate and power consumption. This sub-

GHz radio is compliant with the LoRaWAN® specification v1.0 and radio regulations such as

ETSI EN 300 220, EN 300 113, EN 301 166, FCC CFR 47 part 15, 24, 90, 101 and the ARIB

STD-T30, T-67, T-108.

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 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

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