Overview
The STM32L476RET6 is an ultra-low-power microcontroller from STMicroelectronics, part of the STM32L476xx family. It is based on the high-performance Arm® Cortex®-M4 32-bit RISC core, operating at a frequency of up to 80 MHz. The device features a Floating Point Unit (FPU) that supports all Arm® single-precision data-processing instructions and includes a full set of DSP instructions and a Memory Protection Unit (MPU) for enhanced application security.
The microcontroller is designed for low-power applications, offering various power-saving modes and a wide range of peripherals and interfaces. It is suitable for industrial, medical, and consumer electronics applications where low power consumption and high performance are critical.
Key Specifications
| Parameter | Specification |
|---|---|
| Core | Arm® 32-bit Cortex®-M4 CPU with FPU, up to 80 MHz |
| Flash Memory | Up to 1 MB, 2 banks read-while-write, proprietary code readout protection |
| SRAM | Up to 128 KB, including 32 KB with hardware parity check |
| Power Supply | 1.71 V to 3.6 V (internal LDO), 1.05 to 1.32 V (external SMPS) |
| Temperature Range | -40 °C to 85/105/125 °C |
| ADCs | Up to three 12-bit ADCs, 5 Msps, up to 16-bit with hardware oversampling |
| DACs | Two 12-bit DAC output channels, low-power sample and hold |
| Operational Amplifiers | Two operational amplifiers with built-in PGA |
| Comparators | Two ultra-low-power comparators |
| Timers | 16 timers: 2x 16-bit advanced motor-control, 2x 32-bit, 5x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers |
| Communication Interfaces | USB OTG 2.0 full-speed, 3x I2C, 3x SPI, 5x USART, 1x LPUART, CAN (2.0B Active), SDMMC interface |
| Package | LQFP 64 10x10x1.4 mm |
Key Features
- Ultra-low-power with FlexPowerControl
- Includes ST state-of-the-art patented technology
- 1.71 V to 3.6 V power supply
- -40 °C to 85/105/125 °C temperature range
- Low power modes: 300 nA in VBAT mode, 30 nA Shutdown mode, 120 nA Standby mode, 420 nA Standby mode with RTC, 1.1 µA Stop 2 mode, 1.4 µA with RTC
- Batch acquisition mode (BAM) and 4 µs wakeup from Stop mode
- Brown out reset (BOR) and interconnect matrix
- Integrated LCD driver 8x40 or 4x44 with internal step-up converter
- Up to 24 capacitive sensing channels
- Rich analog peripherals with independent supply
- 14-channel DMA controller, true random number generator, and CRC calculation unit
- Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
- All packages are ECOPACK2 compliant
Applications
- Industrial automation and control systems
- Medical devices requiring low power consumption
- Consumer electronics such as smart home devices and wearables
- Automotive systems, especially those requiring high reliability and low power
- IOT devices and sensor networks
Q & A
- What is the core architecture of the STM32L476RET6?
The STM32L476RET6 is based on the Arm® 32-bit Cortex®-M4 CPU with a Floating Point Unit (FPU), operating at up to 80 MHz.
- What is the power supply range for the STM32L476RET6?
The device operates from a 1.71 V to 3.6 V power supply using the internal LDO regulator, and from 1.05 to 1.32 V using an external SMPS supply.
- What are the key low-power modes of the STM32L476RET6?
The device features several low-power modes including VBAT mode (300 nA), Shutdown mode (30 nA), Standby mode (120 nA), and Stop 2 mode (1.1 µA).
- What types of timers are available on the STM32L476RET6?
The device includes 16 timers: 2x 16-bit advanced motor-control, 2x 32-bit, 5x 16-bit general purpose, 2x 16-bit basic, and 2x low-power 16-bit timers.
- What communication interfaces are supported by the STM32L476RET6?
The device supports USB OTG 2.0 full-speed, 3x I2C, 3x SPI, 5x USART, 1x LPUART, CAN (2.0B Active), and SDMMC interface.
- Does the STM32L476RET6 have any integrated analog peripherals?
Yes, it includes 3x 12-bit ADCs, 2x 12-bit DAC output channels, 2x operational amplifiers with built-in PGA, and 2x ultra-low-power comparators.
- What is the temperature range for the STM32L476RET6?
The device operates in the -40 °C to 85/105/125 °C temperature range.
- Does the STM32L476RET6 support capacitive sensing?
Yes, it supports up to 24 capacitive sensing channels for touchkey, linear, and rotary touch sensors.
- What development tools are available for the STM32L476RET6?
The device supports serial wire debug (SWD), JTAG, and Embedded Trace Macrocell™ for development.
- Is the STM32L476RET6 environmentally friendly?
Yes, all packages of the STM32L476RET6 are ECOPACK2 compliant.
