STMicroelectronics STM32L475RGT7TR

Summary of STM32L475RGT7TR STMicroelectronics 32-bit Microcontroller

The STM32L475RGT7TR from STMicroelectronics is an advanced ultra-low-power microcontroller designed for applications where energy efficiency is critical and high computational capability is required. Based on the 32-bit ARM Cortex-M4 core with floating-point unit (FPU), it operates at frequencies up to 80 MHz and delivers up to 100 DMIPS performance. Offered in a compact 64-pin LQFP package, the STM32L475RGT7TR integrates 1MB Flash memory and 128KB SRAM, positioning it for demanding embedded tasks in consumer, medical, industrial, and portable electronics. Its rich portfolio of analog and digital peripherals, combined with flexible power management and protection features, make it highly adaptable for both battery-powered and performance-sensitive designs.

Main features of the STM32L475RGT7TR STMicroelectronics ultra-low-power platform

Central to the STM32L475RGT7TR is ST’s FlexPowerControl system, which enables multiple operating and sleep states for optimal consumption-versus-performance ratios. Power supply voltages are supported from 1.71V to 3.6V, with multiple temperature grades up to 125/130 °C for extended industrial ranges. In its lowest consumption states, the device achieves down to 30nA in shutdown mode and 300nA in VBAT mode for RTC retention. Advanced features such as batch acquisition mode (BAM), fast wake-up (4µs), and dynamic voltage scaling further extend its suitability in portable applications, supporting instantaneous wake scenarios and background sensor polling. At full speed operation, consumption is impressively low at 100µA/MHz, and the processor’s ART Accelerator ensures zero-wait execution from Flash.

STM32L475RGT7TR STMicroelectronics memory setup Flash memory, SRAM, and security measures

The STM32L475RGT7TR offers robust programmable memory options. With its dual-bank Flash architecture (1MB divided into two banks), users can leverage read-while-write capabilities, streamlining firmware updates and continuous operation. SRAM is split into a 96KB main block and a 32KB retention area, with parity checking for reliability and the option to retain contents in standby. The microcontroller integrates a suite of programmable protections, including multi-level readout protection (RDP), write protection (WRP), and proprietary code readout protection (PCROP). A hardware firewall blocks unauthorized code and data access, essential for application security and firmware IP protection.

Power management and energy-saving modes in STM32L475RGT7TR STMicroelectronics

Meeting the ultra-low-power demands of IoT and portable products, the STM32L475RGT7TR provides fine-grained control over power consumption via seven selectable power modes: run, sleep, low-power run/sleep, stop (three levels), standby, and shutdown. The VBAT pin supports RTC and backup register retention using external batteries or supercapacitors. Dual internal voltage regulators (main and low-power) optimize energy draw for different run/sleep states, while the programmable brown-out reset (BOR) and peripheral supply voltage monitor (PVD) ensure system protection during supply transients. The analog and USB subcircuits are independently supplied, increasing flexibility for low-voltage systems and movement between active and dormant states.

Built-in analog and digital modules in STM32L475RGT7TR STMicroelectronics

Analog integration is a notable strength of the STM32L475RGT7TR. The MCU features three 12-bit ADCs with 5Msps throughput (up to 16 bits via oversampling), dual DACs, two operational amplifiers (with PGA), and two fast comparators. The analog peripherals are designed for independent power supply, allowing their use even when the digital sections are powered down. For sensor interfaces, up to 21 capacitive touch channels are available, supporting touchkey, linear, and rotary acquisition. A DFSDM block with four digital filter modules enables direct connection to sigma-delta modulators and PDM microphones, useful in audio and industrial metrology contexts. Calibration and factory trimming extend the performance range of the temperature sensor and internal reference voltages, ensuring precise measurements across environments.

Supported interfaces and communication options for STM32L475RGT7TR STMicroelectronics

System connectivity is comprehensive in the STM32L475RGT7TR. It includes standard and specialized communication blocks: three I2C (SMBus/PMBus), three SPI (including Quad SPI), five USART/UARTs (with low-power and ISO 7816 smart card support), two SAI (serial audio with full protocol support), full-speed USB OTG, CAN (2.0B active), SDMMC for SD/MMC cards, and a single-wire protocol master interface. All are equipped for DMA-driven data flows, with programmable priorities facilitating concurrent high-speed transfers. The USB subsystem leverages MSI clock trimming, allowing crystal-less operation for device mode and reducing bill of materials and board complexity.

Timer functions and RTC capabilities in STM32L475RGT7TR STMicroelectronics

Tight timing and motor control requirements are addressed via the integrated advanced-control timers, multiple general-purpose and basic timers, and low-power timers operable even in deep sleep states. PWM and input capture, quadrature encoding, infrared remote support, and synchronized multi-timer chainability allow for a spectrum of control and metrology functions. Dual watchdogs (windowed and independent) offer backup in fail-safe, error-prone contexts. The real-time clock (RTC), with subsecond granularity and full calendar functionality, is backed by more than 30 bytes of persistent backup registers and anti-tamper features, maintaining data integrity across power cycles and system resets.

Pin configuration and packaging details for STM32L475RGT7TR STMicroelectronics

The STM32L475RGT7TR features a 64-pin LQFP package (10x10mm) well-suited for both space-constrained and robust board designs. I/O flexibility is high, with more than 100 controllable fast GPIOs, most of which are 5V-tolerant, supporting alternate peripheral mapping and locking mechanisms to prevent inadvertent register writes. Dedicated analog pins, alternate function configurations, and independently supplied I/O domains further enhance integration into complex boards. Pin definitions are robustly supported in the documentation for both package variants, facilitating correct board layout and signal routing.

Electrical performance, thermal properties, and reliability of STM32L475RGT7TR STMicroelectronics

Engineers selecting STM32L475RGT7TR benefit from well-defined and characterized electrical parameters, including absolute maximum ratings, operating voltage and temperature ranges (up to 3.6V and 130 °C junction), and detailed current consumption matrices for each operating mode. Signal input/output parameters, load and switching specifications, ESD and latch-up immunity (fully compliant with IEC-61000 standards), and power dissipation guidance (with ΘJA thermal resistance values) are specified for robust mission profile planning. These enable precise system-level EMC/EMI mitigation, hardware protection strategies, and lifetime/reliability predictions essential for both high-volume consumer and safety-critical industrial products.

Development tools available for STM32L475RGT7TR STMicroelectronics

Supporting rapid prototyping and debugging, the STM32L475RGT7TR offers full access to ARM’s SWJ-DP debug port (combined JTAG and Serial Wire), embedded trace macrocell (ETM) for comprehensive instruction/data flow tracing, and a true random number generator for secure applications. Integrated CRC calculation, a unique 96-bit device identifier, and direct hardware support for common RTOS kernels ensure streamlined integration into modern development workflows. All peripheral and clock domains are mapped clearly for fast application porting and concurrent use of multiple debugging and instrumentation toolchains.

Possible alternative or substitute models for STM32L475RGT7TR STMicroelectronics

Designers considering the STM32L475RGT7TR may also evaluate alternative models within the STM32L4 family, such as STM32L476RG or STM32L471Rx series, which offer similar core and peripheral specifications with incremental changes in memory sizes, package options, and temperature grades. Moreover, for variants requiring additional pins or memory, the STM32L475VGT6 (100-pin LQFP) provides expanded I/O functionality. When cost, footprint, or peripheral count shifts, cross-referencing other STM32L4x5 subseries enables optimal fit without sacrificing core ultra-low-power features. Prior to selecting a direct replacement, engineers should cross-check peripheral maps, package mechanicals, and low-power consumption benchmarks against exact application requirements.

Conclusion

: STM32L475RGT7TR STMicroelectronics as a solution for low-power embedded designs

In summary, the STM32L475RGT7TR by STMicroelectronics combines a high-performance Cortex-M4 processor with comprehensive low-power capabilities and an extensive range of analog and digital peripherals. Its dual-bank Flash, security features, robust memory architecture, and versatile connectivity options make it suitable for a wide array of embedded engineering applications from portable and wearable electronics to industrial automation and metrology. Tight integration of low-power modes and independent supply domains ensures adaptability in battery and energy-sensitive systems, while the platform’s development support and reliability characteristics streamline the journey from design to production. For engineers and procurement professionals, the STM32L475RGT7TR stands out as a reference microcontroller for next-generation, low-power, feature-rich embedded solutions.