STM32L476RCT6 ST Mainstream Arm Cortex-M4 Ultra-Low-Power 32-bit MCU 256KB Flash 128KB SRAM USB CAN OpAmp DAC SAI Touch LQFP-64

STM32L476RCT6 Product Overview

STM32L476RCT6 is an Arm Cortex-M4 MCU at 80 MHz with FPU and ART Accelerator, LQFP-64. 256 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 L471 series, the STM32L476RCT6 adds USB and CAN interfaces, providing a comprehensive ultra-low-power platform for battery-powered IoT nodes, portable meters, and industrial control applications needing industrial bus connectivity and USB communication, while retaining the powerful analog signal chain and audio processing capabilities.

STM32L476RCT6 Core Features

Core: The STM32L476RCT6 features an Arm Cortex-M4 core at 80 MHz, with FPU + ART Accelerator + MPU

Memory: The STM32L476RCT6 provides 256 KB Dual-Bank Flash (RWW), 128 KB SRAM

USB & CAN: The STM32L476RCT6 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 STM32L476RCT6 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

STM32L476RCT6 Applications

IoT & Industrial Bus Nodes: CAN bus sensors and USB data acquisition modules can leverage the STM32L476RCT6's connectivity options

Battery-Powered Sensors: The STM32L476RCT6 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 STM32L476RCT6's low power consumption

Industrial Metering: Water, gas, and electricity meters are perfect applications for the STM32L476RCT6

Audio & Consumer Electronics: The STM32L476RCT6 supports digital audio interfaces, advanced remote controls, and smart cards

Motor Control: Dual-motor FOC and servo drives can rely on the STM32L476RCT6's advanced timers

STM32L476RCT6 Key Advantages

USB + CAN + Ultra-Low Power: The STM32L476RCT6 combines crystal-less USB and industrial CAN bus in one chip for flexible communication

On-Chip Op-Amps + Dual DACs + Dual Comparators: The STM32L476RCT6 delivers powerful analog signal conditioning and output, saving external analog components

256 KB Dual-Bank Flash + 128 KB SRAM: The STM32L476RCT6 supports safe firmware updates and complex data processing

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 STM32L476RCT6

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FAQ

1. What is STM32L476RCT6?
STM32L476RCT6 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 STM32L476RCT6 offers 256 KB Flash, 128 KB SRAM, a segment LCD driver, and a CAN 2.0B interface, making it ideal for cost-sensitive battery-powered devices needing a display and industrial connectivity.

2. What are the key specifications of STM32L476RCT6?

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

• Memory: 256 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 STM32L476RCT6 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 STM32L476RCT6 with a standard soldering iron is straightforward—no hot-air station required—making it very suitable for hand assembly, prototyping, and small-batch production.

4. What applications is STM32L476RCT6 suitable for?
With its segment LCD driver, CAN bus, and rich low-power peripherals, the STM32L476RCT6 is widely used in smart water and gas meters, thermostats, handheld medical instruments, industrial sensor nodes, and portable IoT endpoints requiring an always-on segment display and field communication. The 256 KB Flash provides ample space for moderately sized firmware.

5. What development tools support STM32L476RCT6?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment for the STM32L476RCT6, 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 rapid prototyping.

6. What is the power consumption of the STM32L476RCT6 across its low-power modes?

• Temperature Range: -40 °C to +85 °C

• Ultra-low-power modes of the STM32L476RCT6:

  • 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 STM32L476RCT6 control in the 64-pin package?
In the LQFP-64 package, the LCD controller 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 meter panels with numeric values, units, and simple icons without an external driver chip.

8. What key peripheral interfaces does STM32L476RCT6 offer?
The STM32L476RCT6 provides the following key peripherals:

• 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. How does STM32L476RCT6 differ from STM32L476RET6 and RGT6?
All three share the same LQFP-64 package, pinout, and nearly identical peripherals. The only difference is Flash capacity: the STM32L476RCT6 has 256 KB, RET6 has 512 KB, and RGT6 has 1 MB. SRAM remains 128 KB across all three. If your firmware fits within 256 KB, the STM32L476RCT6 is the most cost-effective choice; larger Flash options provide headroom for future expansion.

10. What is the difference between STM32L476RCT6 and STM32L496RCT6?
Both are 80 MHz Cortex-M4 devices in an LQFP-64 package. The STM32L476RCT6 includes a segment LCD driver and CAN 2.0B interface, making it ideal for segment-display and industrial bus applications. The L496RCT6 typically lacks a segment LCD driver but may offer 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.