STMicroelectronics STM32WL33CBV7

Overview

STM32WL33CBV7 from STMicroelectronics is an ultra-low-power, multiprotocol sub-1 GHz wireless system-on-chip integrating an Arm® Cortex®-M0+ 32-bit MCU (64 MHz), 256 KB flash, 32 KB SRAM, and a fully configurable RF transceiver supporting 2(G)FSK/4(G)FSK/ASK/OOK/D-BPSK/DSSS across 159–958 MHz bands. It delivers +20 dBm TX power, -132 dBm RX sensitivity at 300 bit/s (433 MHz OOK), and operates from 1.7–3.6 V in -40°C to +105°C for battery-powered LPWAN endpoints.

For engineers reviewing the STM32WL33CBV7 datasheet, STM32WL33CBV7 pinout, STM32WL33CBV7 application, or STM32WL33CBV7 equivalent, key selection considerations include its dual-role as application processor + radio controller, autonomous LPAWUR wake-up capability (4 µA, -54 dBm), integrated SMPS with bypass-on-the-fly, and hardware AES-128/TRNG for secure over-the-air updates in certified LPWAN deployments.

Technical Context

The STM32WL33CBV7 implements a tightly coupled SoC architecture where the Cortex-M0+ core shares memory and peripherals with a dedicated sub-GHz RF subsystem via a multilayer AHB bus matrix - enabling concurrent CPU execution and autonomous radio sequencing (Sniff mode, frequency hopping, listen-before-talk). Its RF front-end uses low-IF RX and direct-modulation TX with programmable gain control and I/Q data access for custom protocol implementation.

Power management integrates a digitally controlled SMPS (1.2–2.4 V output), static/dynamic bypass-on-the-fly modes, and three ultra-low-power states: Shutdown (14 nA), Deepstop (960 nA), and WFI (1.3 mA). The LPAWUR operates independently on a 32 kHz clock (LSI or LSE), decoding Manchester-encoded OOK frames with 40-bit sync + 8-bit 0x99 frame sync + 56-bit payload + 16-bit CRC to trigger full-SOC wake-up from Deepstop.

Key Specifications

Pinout & Package

VFQFPN48 package (6 × 6 mm, 0.4 mm pitch), RoHS-compliant and ECOPACK2 certified. Pinout validated per DS14221 Rev 6 schematic and STM32WL33xx reference manual RM0511.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar sub-GHz wireless MCU applications.

Compared with STM32WL33CBV7, STM32WLE5JC offers LoRa-specific certification but sacrifices autonomous wake-up and ultra-low-power Deepstop; CC1352P7RGER provides superior RF sensitivity and dual-band flexibility but requires external PMIC and lacks ST's integrated security boot flow.

Availability

STM32WL33CBV7 is available at Aetrix Electronics and suitable for asset tracking, remote metering, and industrial monitoring requiring stable component supply across automotive-grade temperature ranges (-40°C to +105°C) and global regulatory certifications (ETSI EN 300 220, FCC Part 15/90, ARIB STD-T67).

Supply support for STM32WL33CBV7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32WL series targets certified LPWAN endpoints, combining Arm Cortex-M0+ processing with sub-GHz RF in a single die to eliminate external transceivers and simplify ETSI/FCC-certified design cycles.

FAQ

What is the maximum certified TX output power for STM32WL33CBV7 in ETSI EN 300 220 Category 1 applications?

The STM32WL33CBV7 supports +14 dBm maximum certified output power in ETSI EN 300 220 Category 1 mode when operating in TXHP configuration with appropriate antenna matching and conducted emission filtering. This limit ensures compliance with the 25 mW ERP ceiling for unlicensed 868 MHz band operation without requiring additional spectrum licensing.

Does STM32WL33CBV7 support hardware-accelerated AES encryption for OTA firmware updates?

Yes - the device integrates a dedicated AES-128 co-processor with DMA support, enabling zero-CPU-overhead encryption/decryption of firmware images during secure OTA updates. Combined with read-out protection and secure bootloader disabling of SWD, it meets ETSI EN 303 131 cryptographic assurance requirements for remote metering applications.

Can the LPAWUR operate independently while the main MCU is in Shutdown mode?

Yes - the LPAWUR is powered from the always-on power domain and functions autonomously in Shutdown mode (14 nA) using either the internal 32 kHz LSI oscillator or an external 32 kHz crystal. It detects Manchester-encoded OOK frames and asserts a wakeup interrupt to restore full MCU operation within 10 µs after valid frame detection.

What is the minimum supply voltage required for full 64 MHz CPU operation with SMPS enabled?

The minimum supply voltage for sustained 64 MHz operation with SMPS enabled is 1.95 V, as specified in Table 2 of DS14221 Rev 6. At this input voltage, the SMPS can be configured to output 1.2 V (SMPSLVL = 0–2) to power the core domain, ensuring stable timing margins and meeting the 21 µA/MHz dynamic current target.