STM32L433CBT6

Product Overview

The STM32L433CBT6 is an ultra-low-power 32-bit microcontroller from STMicroelectronics' STM32L4 series, featuring an Arm Cortex-M4 core with a floating-point unit (FPU) and digital signal processing (DSP) instructions. Operating at up to 80 MHz, it integrates 128 KB of Flash memory, 64 KB of SRAM, USB Full-Speed connectivity, and a comprehensive range of analog and digital peripherals.

Designed for energy-efficient embedded applications, the STM32L433CBT6 combines processing performance, low-power operation, and flexible connectivity in a compact LQFP-48 package.

Key Features

• 32-bit Arm Cortex-M4 processor with FPU and DSP instructions

• Maximum CPU frequency of 80 MHz

• 128 KB Flash memory

• 64 KB SRAM, including 16 KB with hardware parity checking

• USB 2.0 Full-Speed interface

• 12-bit ADC and dual-channel 12-bit DAC

• Integrated operational amplifier with programmable gain amplifier functionality

• Two ultra-low-power comparators

• Quad-SPI memory interface

• CAN 2.0B Active support

• Multiple I²C, SPI, and USART communication interfaces

• Low-power modes for battery-operated equipment

• Industrial-grade operating temperature range

• ECOPACK2 compliant package

Technical Specifications

Processor & Architecture

The STM32L433CBT6 uses a 32-bit Arm Cortex-M4 processor running at up to 80 MHz. Its single-precision FPU accelerates floating-point calculations, while DSP instructions support digital filtering, signal processing, and control algorithms.

An integrated memory protection unit (MPU) helps manage memory access and improve software robustness in embedded applications.

Memory & Storage

• 128 KB embedded Flash memory for program code and nonvolatile data

• 64 KB SRAM, including 16 KB with hardware parity checking

• Quad-SPI interface for external serial Flash memory

• Readout protection features to help protect embedded firmware

Analog Peripherals

The device integrates analog resources for measurement, monitoring, and control applications.

• One 12-bit ADC with sampling rates up to 5 MSPS

• Hardware oversampling support for enhanced effective resolution

• Two 12-bit DAC output channels

• One operational amplifier with integrated PGA functionality

• Two ultra-low-power comparators

These peripherals can reduce the need for external analog components in suitable designs.

Timer & PWM Resources

The STM32L433CBT6 provides general-purpose and advanced timer resources for timing, measurement, waveform generation, and control.

• Multiple 16-bit timers

• A 32-bit timer

• PWM generation and input-capture capabilities

• Watchdog timers and system time-base resources

Refer to the official datasheet for the exact timer configuration and channel availability.

Communication & Connectivity

The STM32L433CBT6 supports a broad selection of wired communication interfaces:

• USB 2.0 Full-Speed with crystal-less operation support

• Three I²C interfaces with Fast-mode Plus capability

• Multiple USART interfaces and a low-power UART

• Three SPI interfaces

• Quad-SPI external-memory interface

• CAN 2.0B Active

• SDMMC interface

• SAI serial audio interface

• Single Wire Protocol Master Interface (SWPMI)

• Infrared interface support

The available interface count and pin assignments depend on the device configuration and multiplexed pin functions.

Clock & Power Management

The device includes flexible clock-generation and power-management resources for balancing processing performance with energy consumption.

• Internal and external clock-source options

• Flexible clock configuration for peripheral and system operation

• Multiple low-power operating modes

• Independent analog supply support for applicable peripherals

• Operating supply range of 1.71–3.6 V

Low-Power Operation

As part of the STM32L4 ultra-low-power family, the STM32L433CBT6 is designed for applications that require long battery life without sacrificing general-purpose processing capability.

Its low-power modes, flexible clock control, and low-power peripheral options make it suitable for portable equipment, smart sensors, and energy-conscious embedded controllers.

Power Management

The STM32L433CBT6 integrates power-control features that allow firmware to select suitable operating modes according to application requirements.

Designers should review the datasheet's power-consumption tables and mode-transition requirements when estimating battery life or designing power-sensitive equipment.

Security & Data Integrity

Integrated features supporting system integrity include:

• Memory protection unit (MPU)

• Flash memory readout protection

• Hardware parity checking for a portion of SRAM

• True random number generator (RNG)

• CRC calculation unit

• 96-bit unique device identification

These features can support firmware protection, data validation, and device identification in embedded products.

Development & Debugging

The STM32L433CBT6 supports standard STM32 development workflows and debugging tools.

• Serial Wire Debug (SWD)

• JTAG debugging support

• Embedded Trace Macrocell (ETM) support

• STM32Cube development ecosystem

• Compatible with supported STM32 programming and debugging tools

Check the selected debugger, IDE, and board design for compatibility with the intended debug features.

Applications

The STM32L433CBT6 can be used in a wide range of embedded designs, including:

• Battery-powered IoT devices

• Smart sensors and measurement equipment

• Portable medical and monitoring equipment

• Industrial control and instrumentation

• USB-connected embedded devices

• Smart meters and data loggers

• Building automation

• Consumer electronics

• Low-power communication and control systems

Benefits

• Efficient processing: Cortex-M4 performance with FPU and DSP support.

• Integrated analog resources: ADC, DAC, operational amplifier, and comparators help simplify circuit design.

• Flexible connectivity: USB, CAN, I²C, SPI, and serial interfaces support diverse system architectures.

• Low-power design: Multiple power modes support battery-operated applications.

• Compact footprint: LQFP-48 packaging is suitable for space-conscious PCB designs.

• Established development ecosystem: STM32 tools and documentation support product development and maintenance.

Packaging & Ordering Information

• Part Number: STM32L433CBT6

• Manufacturer: STMicroelectronics

• Device Family: STM32L4 Ultra-Low-Power Microcontrollers

• Package: LQFP-48

• Package Code: LQFP48

• Package Size: 7 × 7 × 1.4 mm

• Packing Type: Tray

• Supply Voltage: 1.71–3.6 V

• Operating Temperature: -40°C to +85°C

• Product Status: Active, in volume production

• Grade: Industrial

• RoHS: ECOPACK2 compliant

Datasheet

For complete electrical characteristics, pin configuration, memory architecture, ADC specifications, timer configuration, communication interfaces, absolute maximum ratings, and application information, please refer to the official STMicroelectronics documentation.

Datasheet: Official STM32L433CBT6 Datasheet

Frequently Asked Questions

What is the maximum operating frequency of the STM32L433CBT6?

The Arm Cortex-M4 core operates at up to 80 MHz.

How much Flash memory and SRAM does it have?

The STM32L433CBT6 provides 128 KB of Flash memory and 64 KB of SRAM.

What package does the STM32L433CBT6 use?

It uses an LQFP-48 package measuring 7 × 7 × 1.4 mm.

Does the STM32L433CBT6 support USB?

Yes. It includes a USB 2.0 Full-Speed interface with crystal-less operation support.

What is its operating voltage range?

The specified supply voltage range is 1.71–3.6 V.

Is the STM32L433CBT6 suitable for industrial applications?

Yes. The device is classified as industrial grade, with an operating temperature range of -40°C to +85°C.

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