STMicroelectronics STM32L475RCT7TR

Overview

STM32L475RCT7TR from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 256 KB Flash, 64 KB SRAM, USB OTG FS, dual SAI audio interfaces, and CAN 2.0B. It integrates 3×12-bit ADCs (5 Msps), 2×12-bit DACs, 2×op-amps with PGA, and 2×ultra-low-power comparators - deployed in battery-powered industrial sensors and portable medical monitors requiring sub-μA standby operation.

For engineers reviewing the STM32L475RCT7TR datasheet, STM32L475RCT7TR pinout, STM32L475RCT7TR application, or STM32L475RCT7TR equivalent, key selection criteria include its 125 °C extended temperature rating, LQFP64 package with 51 GPIOs (most 5 V-tolerant), Stop 2 mode current of 1.1 µA, ART Accelerator™ enabling zero-wait-state Flash execution, and integrated DFSDM for sigma-delta sensor interfacing.

Technical Context

This MCU implements an Adaptive Real-Time Accelerator (ART Accelerator™) that eliminates Flash wait states at 80 MHz, delivering 3.42 CoreMark/MHz. Its power architecture includes three low-power modes (Stop 0/1/2) with distinct voltage scaling and peripheral gating, plus VBAT domain supporting RTC and 32×32-bit backup registers at 300 nA.

The clock system features four independent sources - HSE (4–48 MHz), LSE (32.768 kHz), HSI16 (±1%), and MSI (100 kHz–48 MHz auto-trimmed by LSE) - feeding three PLLs for system, USB, and audio domains. Peripheral interconnect uses a multi-layer AHB/APB matrix enabling concurrent high-bandwidth transfers without bus contention.

Key Specifications

Pinout & Package

LQFP64 package with exposed thermal pad (ECOPACK2® compliant); 64-pin square outline, 0.5 mm pitch, 10 mm × 10 mm body size. Pin 1 marked by dot or bevelled corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power Cortex-M4 MCU applications.

Compared with STM32L475RCT7TR, the STM32L476RGT6 offers double Flash/SRAM for complex protocol stacks but omits DFSDM for sigma-delta sensors, while the STM32L552RET6 adds TrustZone security at the cost of 30% higher active power - making the L475 optimal for cost-sensitive, analog-intensive, ultra-low-power edge nodes.

Availability

STM32L475RCT7TR is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial sensor nodes, and audio-enabled thermostats requiring stable component supply across long-lifecycle deployments.

Supply support for STM32L475RCT7TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance per microamp, with emphasis on battery longevity, analog integration, and real-time responsiveness in constrained environments.

FAQ

What is the maximum operating frequency and corresponding DMIPS rating?

The STM32L475RCT7TR operates at up to 80 MHz with an integer performance of 100 DMIPS (Dhrystone 2.1). This is achieved using the ART Accelerator™, which enables zero-wait-state execution from Flash memory. The core is an Arm Cortex-M4 with FPU, supporting DSP instructions and a Memory Protection Unit (MPU) for deterministic real-time operation.

Does this MCU support hardware encryption or secure boot features?

The STM32L475RCT7TR includes a true random number generator (RNG), CRC calculation unit, and 96-bit unique ID - sufficient for basic cryptographic key derivation and firmware integrity checks. However, it lacks ARM TrustZone® or dedicated secure boot ROM; secure boot must be implemented in software using external flash or bootloader validation. For certified secure boot, consider the STM32L5 series.

What are the key low-power mode current figures and wakeup latency?

In Stop 2 mode, current consumption is 1.1 µA (typical); Standby with RTC draws 420 nA; Shutdown mode consumes 30 nA. Wakeup from Stop mode takes 4 µs - verified across all supply voltages and temperature ranges. These values assume default configuration with ART Accelerator™ enabled and no active peripherals.

Can the DFSDM interface be used with external sigma-delta ADCs like the AD7768?

Yes - the DFSDM module supports external sigma-delta modulators via dedicated SDMOD pins (e.g., PA12, PA15). It provides four independent channels, each with configurable sinc filters (sinc1–sinc3), decimation rates up to 32, and DMA-triggered data transfer. The AD7768 is compatible when configured for single-bit output and matched clocking (MSI-derived DFSDMCLK).