STM32L476RGT6
Ultra-low-power STM32L4 MCU with 80MHz Cortex-M4 core, 1MB Flash, 128KB RAM, and rich peripherals for battery-powered applications.
Product Overview
Description
The STM32L476RGT6 is an ultra-low-power microcontroller featuring the ARM Cortex-M4 core with FPU, designed for battery-powered and energy-harvesting applications.
With 1MB Flash and 128KB SRAM, it provides ample resources for complex applications while maintaining industry-leading low power consumption.
The device achieves 100uA/MHz in Run mode and down to 130nA in Shutdown mode with RTC, enabling years of operation on small batteries.
Product Series
Primary Application
Key Features
- ARM Cortex-M4 with single-precision FPU
- 80 MHz maximum frequency, 100uA/MHz
- 1MB Flash with ECC
- 128KB SRAM
- Ultra-low power modes: 130nA Shutdown
- Operating temperature: -40°C to +85°C
Specifications
| Core | ARM Cortex-M4 |
|---|---|
| Frequency | 80 MHz |
| Flash Memory | 1 MB |
| SRAM | 128 KB |
| GPIO | 82 |
| ADC | 3x 12-bit |
| Package | LQFP-64 |
| Voltage Rating | N/A |
| Current Rating | N/A |
| Temperature Range | N/A |
| Operating Voltage | N/A |
| Qualification | N/A |
| Interface | N/A |
| DAC | N/A |
Applications
Battery-powered IoT devices
Industrial application for Ultra-Low-Power ARM Cortex-M4 MCU
Wearable electronics
Industrial application for Ultra-Low-Power ARM Cortex-M4 MCU
Smart sensors
Industrial application for Ultra-Low-Power ARM Cortex-M4 MCU
Medical devices
Industrial application for Ultra-Low-Power ARM Cortex-M4 MCU
Energy harvesting systems
Industrial application for Ultra-Low-Power ARM Cortex-M4 MCU
FAE Expert Insights
"The STM32L476RGT6 is my go-to recommendation for battery-powered applications. The ultra-low power consumption is exceptional - I've measured it in real designs and it consistently delivers on the datasheet promises. The 100uA/MHz in Run mode and sub-microamp sleep modes enable multi-year battery life from small coin cells. The L4 series maintains excellent peripheral integration including USB, SD card interface, and rich analog features that are often missing in competing low-power MCUs. The migration path from F4 series is straightforward since they share the same Cortex-M4 core. I've used this MCU in dozens of IoT sensor designs with outstanding results. The STM32Cube ecosystem provides excellent low-power optimization tools."
Industry-leading ultra-low power with rich peripheral integration
— David Martinez, BeiLuo
Frequently Asked Questions
What makes STM32L4 series ultra-low power?
The STM32L4 achieves ultra-low power through multiple innovations: Advanced 90nm process technology optimized for low leakage; Multiple low-power modes including Sleep, Stop0/1/2, and Shutdown; Flexible clock gating to disable unused peripherals; Low-power voltage regulators; Fast wake-up times from sleep modes (8us from Stop mode). The combination of these features enables 100uA/MHz in Run mode and down to 130nA in Shutdown mode with RTC running.
Use STM32CubeMX power calculator to optimize power consumption for your specific application.
How long can STM32L476 run on a coin cell battery?
Battery life depends on duty cycle and operating mode. Example calculations: Continuous operation at 80MHz consumes ~8mA, giving ~28 hours from CR2032; 1% duty cycle (1s active, 99s sleep) with Stop2 mode achieves ~2-3 years; Event-driven operation with mostly Shutdown mode can achieve 5+ years. The STM32L4's fast wake-up (8us) enables aggressive duty cycling without missing events.
Implement aggressive duty cycling with deep sleep modes for maximum battery life.
What is the difference between Stop and Shutdown modes?
Stop modes (Stop0/1/2) maintain SRAM content and register state with fast wake-up (8-12us). Peripherals can be configured to wake the MCU. Stop2 offers lowest power with 1.2uA consumption. Shutdown mode is the deepest sleep with 130nA consumption but loses SRAM content (only backup domain retained). Wake-up from Shutdown requires reset. Choose Stop modes for intermittent operation requiring state retention. Choose Shutdown for longest battery life with periodic wake-up.
Use Stop2 for most battery-powered applications. Use Shutdown only if state retention is not required.
Can STM32L4 replace STM32F4 in existing designs?
The STM32L4 can replace STM32F4 in many applications with some considerations: Lower maximum frequency (80MHz vs 168MHz+) but better efficiency; Pin-compatible packages available for many variants; Same Cortex-M4 core with FPU ensures software compatibility; Different peripheral set - verify all required peripherals are available; Lower power consumption enables new battery-powered applications. Migration requires re-validation but is straightforward with STM32Cube ecosystem.
Evaluate if 80MHz is sufficient for your application. Consider L4 for new battery-powered designs.
What debugging features are available for low-power development?
STM32L4 supports debugging in all power modes: Standard SWD/JTAG debugging with breakpoints and single-stepping; Debug in Stop mode with core halted; Power consumption measurement through debug interface; STM32CubeIDE includes power profiling tools; Ultra-low-power debugging requires special considerations - debug connection may increase power consumption. Use SWO for printf debugging without UART. Consider using debuggers with low-power awareness.
Use STM32CubeIDE power profiling to visualize current consumption during debugging.
What analog peripherals does STM32L476 include?
The STM32L476 includes rich analog peripherals: 3x 12-bit ADCs with up to 16 channels each, 1Msps sample rate; 2x 12-bit DACs for analog output; 2x operational amplifiers with programmable gain; 2x ultra-low-power comparators; Capacitive sensing touch controller with up to 24 channels. These integrated analog features reduce external component count and enable sophisticated sensor interfaces without external analog front-ends.
Leverage integrated analog peripherals to reduce BOM cost and PCB complexity.