STMicroelectronics STM32WL33CBV6

Overview

STM32WL33CBV6 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 max), 256 KB flash, 32 KB SRAM, and a certified RF transceiver supporting 2(G)FSK/4(G)FSK/OOK/ASK/D-BPSK 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 STM32WL33CBV6 datasheet, STM32WL33CBV6 pinout, STM32WL33CBV6 application, or STM32WL33CBV6 equivalent, key selection considerations include its integrated LPAWUR wake-up receiver (-54 dBm sensitivity, 4 µA always-on), dual-power supply architecture (SMPS + BOF modes), and hardware sequencer enabling autonomous low-duty-cycle radio operations compliant with ETSI EN 300 220, FCC Part 15/90, and ARIB STD T67.

Technical Context

The STM32WL33CBV6 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. Its radio subsystem features independent digital (MR_SUBG) and analog (RF_SUBG) IP blocks, with hardware-accelerated modulation/demodulation and IQ data access for custom protocol implementation.

It supports autonomous radio sequencing-including Sniff mode, frequency hopping, and Listen-Before-Talk-via a fully configurable hardware sequencer, while the Low-Power Autonomous Wake-Up Receiver (LPAWUR) operates independently in Deepstop mode using Manchester-encoded OOK frames (40-bit sync + 8-bit 0x99 frame sync + 56-bit payload + 16-bit CRC) with 1 kbit/s raw data rate.

Key Specifications

Pinout & Package

STM32WL33CBV6 is housed in a VFQFPN48 package (6 × 6 mm, 0.4 mm pitch), RoHS-compliant and ECOPACK2-certified. This 48-pin QFN exposes up to 32 GPIOs with retention capability, supporting flexible peripheral routing and low-inductance RF layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32WL33CBV6, STM32WLE5JC offers higher processing headroom but lacks LPAWUR and has lower RX sensitivity (-127 dBm), while CC1312R7 provides BLE compatibility but requires external flash for full protocol stacks and lacks integrated SMPS bypass optimization for ultra-low-power RX.

Availability

STM32WL33CBV6 is available at Aetrix Electronics and suitable for asset tracking, wireless sensors, and remote metering requiring stable component supply across automotive-grade temperature ranges (-40°C to +105°C) and global regulatory certifications (ETSI/FCC/ARIB).

Supply support for STM32WL33CBV6 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, delivering microcontrollers, power management, and analog/mixed-signal solutions for industrial, automotive, and IoT markets.

The STM32WL33xx series belongs to ST's ultra-low-power wireless MCU product line, designed specifically for battery-operated LPWAN endpoints requiring integrated RF, security, and analog peripherals in a single die - targeting multi-year operation on coin cells or energy-harvesting sources.

FAQ

What is the maximum certified TX output power and associated current draw for STM32WL33CBV6?

The STM32WL33CBV6 achieves +20 dBm output power in TX+TXHP mode with 78 mA current draw at VDD = 3.3 V, verified per ETSI EN 300 220 Category 1 and FCC Part 15. This configuration requires external matching network tuning and thermal derating above 60°C ambient.

Does STM32WL33CBV6 support hardware-accelerated AES encryption and secure boot?

Yes - it integrates a dedicated AES-128 co-processor and 16-bit TRNG, with secure bootloader that disables SWD debug interface upon activation and enforces flash read-out protection. The bootloader validates signature of application image before execution, meeting IEC 62443-3-3 SL2 requirements for secure firmware updates.

How does the LPAWUR function differ from standard RF wake-up in deep-sleep modes?

LPAWUR operates entirely autonomously in Deepstop mode using a dedicated OOK receiver path consuming only 4 µA, detecting pre-defined Manchester-encoded frames (40-bit sync + 0x99 sync byte). Unlike standard RF wake-up, it requires no CPU clock or RAM retention - enabling true zero-power listening with guaranteed 100 ms wake-up latency.

Can STM32WL33CBV6 be used with external crystals for both HSE and LSE, and what are the tolerance requirements?

Yes - it supports 48 MHz ±100 ppm HSE crystal with integrated trimming capacitors (no external caps needed), and 32.768 kHz ±20 ppm LSE crystal for RTC and LPAWUR timing. The LSE tolerance directly impacts LPAWUR frame detection accuracy and must meet ±20 ppm to maintain <1 ppm timing drift over temperature.