STM32L476RET6 ST Mainstream Arm Cortex-M4 Ultra-Low-Power 32-bit MCU 512KB Flash 128KB SRAM USB CAN OpAmp DAC SAI Touch LQFP-64

STM32L476RET6 Product Overview

STM32L476RET6 is an Arm Cortex-M4 MCU at 80 MHz with FPU and ART Accelerator, LQFP-64. 512 KB Dual-Bank Flash, 128 KB SRAM, USB OTG FS (crystal-less), CAN 2.0B, two 12-bit ADCs (5 Msps, 16 ch), two 12-bit DACs, two op-amps (8 MHz GBW), two comparators, capacitive touch sensing (TSC), true random number generator (TRNG), 2×SAI audio interfaces, SDMMC (4-bit), LP timers, RTC, 3×USART, 1×UART, 1×LPUART, 2×SPI/I2S, 3×I2C. Up to 51 x 5 V-tolerant I/Os. 1.71–3.6 V, -40–85 °C. Compared to the STM32L476RCT6 (256 KB Flash), the STM32L476RET6 doubles the Flash to 512 KB, providing an even more spacious ultra-low-power platform for battery-powered IoT nodes, portable meters, and industrial control applications needing larger program storage, USB, CAN, and rich analog and audio features.

STM32L476RET6 Core Features

Core: The STM32L476RET6 features an Arm Cortex-M4 core at 80 MHz, with FPU + ART Accelerator + MPU

Memory: The STM32L476RET6 provides 512 KB Dual-Bank Flash (RWW), 128 KB SRAM

USB & CAN: The STM32L476RET6 integrates USB OTG FS (Crystal-less), CAN 2.0B

Analog: 2×12-bit ADCs (5 Msps, 16 ch), 2×12-bit DACs, 2×Op-Amps (PGA), 2×Comparators

Audio & Storage: 2×SAI audio interfaces, SDMMC (4-bit)

Capacitive Touch: The STM32L476RET6 features Capacitive Touch Sensing (TSC)

Connectivity: 3×USART, 1×UART, 1×LPUART, 2×SPI/I2S, 3×I2C

Security: True Random Number Generator (TRNG)

Timers: 2×Advanced Motor Control Timers, multiple GP/LP timers, RTC

I/Os: 51 (5 V-tolerant)

Package: LQFP-64

Temperature Range: -40°C to 85°C

STM32L476RET6 Applications

IoT & Industrial Bus Nodes: CAN bus sensors and USB data acquisition modules can leverage the STM32L476RET6's connectivity options

Battery-Powered Sensors: The STM32L476RET6 is ideal for wireless sensors needing analog signal conditioning and high-precision acquisition

Portable Devices: Wearables, portable medical devices, and USB peripherals benefit from the STM32L476RET6's low power consumption

Industrial Metering: Water, gas, and electricity meters are perfect applications for the STM32L476RET6

Audio & Consumer Electronics: The STM32L476RET6 supports digital audio interfaces, advanced remote controls, and smart cards

Motor Control: Dual-motor FOC and servo drives can rely on the STM32L476RET6's advanced timers

STM32L476RET6 Key Advantages

512 KB Dual-Bank Flash + 128 KB SRAM: The STM32L476RET6 provides large storage that supports safe firmware updates and complex applications

USB + CAN + Ultra-Low Power: The STM32L476RET6 features crystal-less USB and industrial CAN bus for flexible communication

On-Chip Op-Amps + Dual DACs + Dual Comparators: The STM32L476RET6 delivers powerful analog signal conditioning and output, saving external analog components

SAI Audio + SDMMC: Flexible audio interface and external storage expansion

51 x 5 V-tolerant I/Os in LQFP-64: High-density connectivity with enhanced noise immunity

Cortex-M4 + FPU + Ultra-Low Power: Excellent DSP and floating-point performance while maintaining extremely low power consumption

Full Ecosystem Compatibility: Easy development with STM32CubeIDE/HAL/LL libraries for the STM32L476RET6

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FAQ

1. What is STM32L476RET6?
STM32L476RET6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L4 series, built around an Arm® Cortex®-M4 core with FPU and DSP instructions in an LQFP-64 package. Operating at 80 MHz, the STM32L476RET6 offers 512 KB Flash, 128 KB SRAM, a segment LCD driver, and a CAN interface, making it ideal for battery-powered devices needing a segment display and industrial connectivity.

2. What are the key specifications of STM32L476RET6?

• Core: Arm® Cortex®-M4, up to 80 MHz, 100 DMIPS with FPU and DSP

• Memory: 512 KB Flash, 128 KB SRAM

• Operating Voltage: 1.71 V to 3.6 V

• Temperature Range: -40 °C to +85 °C (industrial grade)

• I/O Count: up to 51

• Package: LQFP-64 (10 mm × 10 mm)

3. Is the STM32L476RET6 package easy to solder?
It comes in an LQFP-64 package measuring 10 mm × 10 mm with exposed 0.5 mm pitch leads. Drag-soldering the STM32L476RET6 with a standard soldering iron and flux is straightforward—no hot-air station required—making it very suitable for hand assembly, prototyping, and rework.

4. What applications is STM32L476RET6 suitable for?
With its integrated segment LCD driver, CAN 2.0B interface, and rich low-power peripherals, the STM32L476RET6 is widely used in smart water and gas meters, thermostats, handheld medical instruments, industrial sensor nodes, and portable IoT endpoints requiring a segment display and fieldbus communication.

5. What development tools support STM32L476RET6?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment for the STM32L476RET6, along with the STM32CubeL4 firmware library. Debugging and programming are handled by ST-Link debuggers. The pin-compatible NUCLEO-L476RG board is an excellent starting point for prototyping and code migration.

6. What is the power consumption of the STM32L476RET6 across its low-power modes?

• Temperature Range: -40 °C to +85 °C

• Ultra-low-power modes of the STM32L476RET6:

  • Shutdown mode: ~33 nA (5 wake-up pins)

  • Standby mode: ~125 nA (5 wake-up pins), ~430 nA with RTC

  • Stop 2 mode: ~1.2 µA, ~1.4 µA with RTC

  • Run mode: ~100 µA/MHz (LDO mode)

7. How many segments can the LCD driver on the STM32L476RET6 control in the 64-pin package?
In the LQFP-64 package, the LCD controller of the STM32L476RET6 can still be configured for up to 8 common lines and 28 segment lines (8 COM × 28 SEG), driving up to 224 segments. This easily covers most meter panels requiring numeric values, symbols, and simple icons without an external driver chip.

8. What key peripheral interfaces does STM32L476RET6 offer?

• Communication: CAN 2.0B, I²C, SPI, UART/USART, USB OTG FS, SAI (I2S/PCM/PDM)

• Analog: 12-bit 5 Msps ADC, 12-bit DAC, ultra-low-power comparators

• Timers: 16-bit and 32-bit general-purpose timers, advanced motor-control timer

• Others: Quad SPI interface, SDMMC interface, segment LCD driver

9. What is the difference between STM32L476RET6 and STM32L476RGT6?
Both share the same LQFP-64 package, pinout, and peripheral set. The only difference is Flash capacity: the STM32L476RET6 has 512 KB while the RGT6 has 1 MB. If your firmware fits within 512 KB, the STM32L476RET6 is a more cost-effective choice; otherwise, RGT6 provides extra space for larger applications or future expansion.

10. How does STM32L476RET6 differ from STM32L496RET6?
Both are 80 MHz Cortex-M4 devices in an LQFP-64 package. The STM32L476RET6 features a segment LCD driver and CAN 2.0B interface, making it better for segment-display and industrial bus applications. The L496RET6 typically lacks a segment LCD driver but offers a Chrom-ART graphics accelerator and camera interface, targeting TFT display and image processing. Choose based on whether you need segment LCD/CAN or graphics acceleration.