STMicroelectronics STM32L475RCT6

Overview

STM32L475RCT6 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 integrated analog peripherals including three 12-bit ADCs (5 Msps), two 12-bit DACs, two op-amps, and two ultra-low-power comparators. It targets battery-powered IoT edge nodes requiring real-time audio processing and sensor fusion.

For engineers reviewing the STM32L475RCT6 datasheet, STM32L475RCT6 pinout, STM32L475RCT6 application, or STM32L475RCT6 equivalent, key selection criteria include its 30 nA shutdown current, 420 nA standby-with-RTC, 1.1 µA/MHz run efficiency, LQFP64 package compatibility, and support for batch acquisition mode (BAM) in low-power sensor aggregation systems.

Technical Context

The device integrates an Adaptive Real-time Accelerator (ART Accelerator™) enabling zero-wait-state execution from Flash at 80 MHz, alongside a memory protection unit (MPU) and interconnect matrix for deterministic peripheral arbitration. Its power architecture includes three voltage scaling ranges (VOS0–VOS2) and five low-power modes-Shutdown (30 nA), Standby (120 nA), Stop 2 (420 nA with RTC), and Run (100 µA/MHz)-managed by a dedicated power control block with BOR and VBAT backup support.

Clock system flexibility is provided by four independent sources: HSE (4–48 MHz), LSE (32.768 kHz), HSI16 (±1%), and MSI (100 kHz–48 MHz auto-trimmed by LSE <±0.25%). Three PLLs generate system, USB, and audio clocks, while the DFSDM supports sigma-delta modulator filtering for high-resolution sensor data acquisition.

Key Specifications

Pinout & Package

LQFP64 package with 64-pin square outline, 0.5 mm pitch, and exposed thermal pad (EP). Pin mapping validated per DS10969 Rev 5 Section 4 (Pinouts and pin description) and Table 16 (STM32L475xx pin definitions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L433RCT6, the STM32L475RCT6 adds dual SAI and USB OTG for audio-centric designs; versus STM32L4R5ZIT6, it trades Flash/SRAM capacity for lower static current and integrated DFSDM - making it optimal for battery-powered audio-sensing endpoints rather than compute-heavy gateways.

Availability

STM32L475RCT6 is available at Aetrix Electronics and suitable for wearable health monitors, smart building sensor nodes, industrial audio edge gateways, and portable medical diagnostic devices requiring stable component supply across multi-year production cycles.

Supply support for STM32L475RCT6 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 management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The STM32L4 series is engineered for ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time performance - targeting IoT edge nodes, portable medical devices, and energy-harvesting systems.

FAQ

What is the maximum operating temperature range for STM32L475RCT6?

The STM32L475RCT6 is qualified for industrial operation from –40 °C to +85 °C (ambient), with extended variants supporting +105 °C and +125 °C. This rating is confirmed in DS10969 Rev 5 Section 6.3.1 and applies to the LQFP64 package under specified thermal conditions (θ_JA = 41 °C/W).

Does STM32L475RCT6 support hardware encryption acceleration?

No, the STM32L475RCT6 does not integrate a dedicated cryptographic accelerator (e.g., AES, SHA, PKA). It relies on software libraries (STM32CubeL4) for encryption; however, its True RNG (NIST SP800-90B compliant) and 96-bit unique ID provide foundational security primitives for key derivation and device identity.

Can the internal 32 kHz RC oscillator replace the external LSE crystal for RTC operation?

Yes - the internal LSI (32 kHz ±5%) can drive the RTC, but only in applications where ±5% timekeeping accuracy is acceptable. For calendar-grade accuracy (e.g., timestamping, alarms), the external 32.768 kHz crystal (LSE) is required, as documented in Section 3.11 and Table 48 of DS10969 Rev 5.

How many I/O pins support 5 V tolerance on STM32L475RCT6?

51 of the 64 I/O pins on the STM32L475RCT6 are 5 V-tolerant, as specified in Section 3.12 and Table 16 of DS10969 Rev 5. Pins marked "FT" (e.g., PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE15) tolerate up to 5.5 V regardless of VDD level, simplifying interface with legacy 5 V peripherals.