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STMicroelectronics STM32L475RCT7
- Part No.:
- STM32L475RCT7
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32L475RCT7.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,158
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Product details
Overview
STM32L475RCT7 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) and two 12-bit DACs. It targets battery-powered IoT edge nodes requiring real-time audio processing, capacitive touch, and secure low-power operation.
For engineers reviewing the STM32L475RCT7 datasheet, STM32L475RCT7 pinout, STM32L475RCT7 application, or STM32L475RCT7 equivalent, key selection criteria include its 30 nA shutdown current, 4 µs wakeup from Stop mode, dual 12-bit DACs with sample-and-hold, and LQFP64 package compatibility with legacy STM32L4 designs.
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 supports five low-power modes - Shutdown (30 nA), Standby (120 nA), Stop 2 (1.1 µA), and Run (100 µA/MHz) - with hardware calendar RTC and VBAT-supplied backup registers.
Clock system includes four independent sources: HSE (4–48 MHz), LSE (32.768 kHz), HSI16 (±1%), and MSI (100 kHz–48 MHz, auto-trimmed by LSE). Three PLLs separately feed system, USB, and audio clocks, while the DFSDM enables sigma-delta sensor interfacing without CPU load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU, 80 MHz max, 100 DMIPS - enables real-time DSP tasks like audio filtering or motor control without external co-processor. |
| Memory | 256 KB Flash (2 banks, read-while-write), 64 KB SRAM (32 KB with parity) - supports firmware updates over-the-air and safety-critical data integrity. |
| Power Consumption | 30 nA Shutdown, 1.1 µA Stop 2, 100 µA/MHz Run - extends coin-cell battery life to multi-year operation in sensor endpoints. |
| Analog Peripherals | 3× 12-bit ADC (5 Msps, 16-bit oversampling), 2× 12-bit DAC (low-power sample-and-hold), 2× op-amps with PGA - enables high-fidelity sensor signal chain and analog actuator control in single chip. |
| Audio Interfaces | 2× SAI (serial audio interface), USB OTG FS with LPM - supports stereo I²S microphone input + speaker output or USB audio class streaming. |
| Low-Power Timers | 2× LPTIM (available in Stop 2 mode), 16× total timers including advanced motor-control TIM1/TIM8 - allows precise timing for wake-up events and PWM generation during deep sleep. |
| Package | LQFP64 (10 × 10 mm, 0.5 mm pitch) - standard footprint compatible with automated PCB assembly and thermal management in compact industrial modules. |
Pinout & Package
LQFP64 package with 64 leads, 0.5 mm pitch, 10 × 10 mm body, ECOPACK2® compliant. Pin functions validated per STMicroelectronics DS10969 Rev 5 Section 4 (Pinouts and pin description) and Table 16 (STM32L475xx pin definitions).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | 1.71–3.6 V operation; separate VDDA/VSSA pins ensure clean analog supply for ADC/DAC/OPAMP. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE15 | General-purpose I/Os | Up to 51 fast I/Os (most 5 V-tolerant); support 16 alternate functions including SAI, USB, CAN, and DFSDM. |
| PA2/PA3 | USART2_TX/USART2_RX | Dedicated full-duplex UART for debug or host communication; LPUART on PA2/PA3 enables Stop 2 wakeup via serial activity. |
| PA4–PA7 | SAI1_MCLK/SAI1_SCK/SAI1_FS/SAI1_SD | Primary serial audio interface pins - support master clock, bit clock, frame sync, and data for I²S/PCM audio streaming. |
| PA11/PA12 | USB_DM/USB_DP | Full-speed USB 2.0 physical layer; integrated transceiver eliminates external PHY, reducing BOM cost and board space. |
| VBAT | Battery backup supply | Connects to coin cell to maintain RTC calendar and 32×32-bit backup registers during main power loss. |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Five configurable low-power modes with sub-µA quiescent currents and <4 µs wakeup - enables responsive yet energy-efficient sensor polling cycles. |
| ART Accelerator™ | Zero-wait-state Flash execution at 80 MHz - eliminates performance penalty of internal memory latency for deterministic real-time code. |
| Dual SAI interfaces | Independent I²S/PCM controllers supporting simultaneous stereo input and output - enables voice assistant front-end with mic array + speaker feedback in one MCU. |
| Capacitive touch sensing (TSC) | 21-channel hardware-accelerated touch controller - supports up to 16 touchkeys or rotary sliders without CPU overhead or external IC. |
| DFSDM filters | 4 digital filters for sigma-delta modulators - enables direct connection of MEMS microphones or pressure sensors with oversampled digital output, bypassing ADC. |
| Hardware crypto acceleration | True random number generator (RNG), CRC unit, 96-bit unique ID - provides foundational security for firmware signing, key generation, and anti-cloning. |
Applications
| Wearable Health Monitor | Smart Home Audio Node |
|---|---|
Use Scenario: Continuous ECG/PPG signal acquisition with Bluetooth LE telemetry and local anomaly detection. IC Role / Device Role / Timing Role: Central MCU managing analog front-end (ADC + OPAMP), real-time filtering (Cortex-M4 FPU), and low-power BLE co-processor interface via USART. Use Value: 30 nA shutdown and 1.1 µA Stop 2 enable multi-week battery life; dual SAI supports synchronized multi-sensor sampling. | Use Scenario: Voice-controlled smart speaker with far-field mic array, local wake-word detection, and USB audio playback. IC Role / Device Role / Timing Role: Audio hub handling I²S mic input (SAI1), I²S speaker output (SAI2), USB audio class streaming, and DSP-based keyword spotting. Use Value: Integrated DFSDM filters process sigma-delta mic data without CPU load; ART Accelerator ensures real-time FFT execution at 80 MHz. |
| Industrial Wireless Sensor | Energy Meter with Tamper Detection |
Use Scenario: Battery-powered vibration/temperature node transmitting LoRaWAN telemetry every 15 minutes. IC Role / Device Role / Timing Role: Low-power sensor aggregator with RTC-triggered wake-up, ADC sampling, and SPI-connected LoRa transceiver control. Use Value: 120 nA Standby mode with 5 wakeup pins allows flexible event-driven scheduling; VBAT-backed RTC maintains accurate time across 10-year deployments. | Use Scenario: DIN-rail energy meter with isolated current/voltage sensing, tamper switch monitoring, and secure data logging. IC Role / Device Role / Timing Role: Secure metering controller running AES-128 encryption (via RNG + CRC), managing 3× ADC channels, and driving LCD via GPIO. Use Value: 32 KB SRAM with hardware parity prevents corruption of billing data; 5 V-tolerant I/Os interface directly with isolation logic and tamper switches. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power Cortex-M4 MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L432KCU6 | 64 KB Flash, 16 KB SRAM, no SAI, no USB OTG, LQFP32 package | Targeted at simpler sensor nodes without audio or host connectivity | Select when audio, USB, or >128 KB RAM is unnecessary - reduces cost and footprint. |
| STM32L552RET6 | Arm TrustZone®, 512 KB Flash, 256 KB SRAM, same LQFP64, higher active current (140 µA/MHz) | Required for PSA Level 2 certified secure boot and runtime attestation | Choose when hardware-enforced security isolation is mandatory - accepts 40% higher active power for certified trust anchor. |
Compared with STM32L432KCU6, the STM32L475RCT7 adds dual SAI, USB OTG, and 4× more RAM for audio edge processing; versus STM32L552RET6, it trades TrustZone security for 30% lower active power and proven field reliability in cost-sensitive industrial designs.
Availability
STM32L475RCT7 is available at Aetrix Electronics and suitable for wearable health monitors, smart home audio nodes, industrial wireless sensors, and energy meters requiring stable component supply across multi-year production cycles.
Supply support for STM32L475RCT7 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 automotive semiconductors since 1987.
The STM32L4 series is engineered for ultra-low-power embedded applications demanding extended battery life, rich analog integration, and real-time performance - targeting IoT endpoints, portable medical devices, and intelligent industrial sensors.
FAQ
What is the maximum operating frequency and corresponding DMIPS rating of the STM32L475RCT7?
The STM32L475RCT7 operates at up to 80 MHz with an Arm Cortex-M4 core featuring FPU and ART Accelerator™, delivering 100 DMIPS (Dhrystone 2.1). This performance level is sustained across its full voltage range (1.71–3.6 V) and temperature range (–40 °C to 85 °C), verified per DS10969 Rev 5 Section 3.1 and Table 4.
Does the STM32L475RCT7 support USB device functionality without an external PHY?
Yes - the STM32L475RCT7 integrates a full-speed USB 2.0 OTG FS transceiver with built-in PHY on PA11 (DM) and PA12 (DP). It supports USB device, host, and OTG roles with Link Power Management (LPM) and Battery Charging Detection (BCD), eliminating need for external PHY components per Section 3.33 of DS10969 Rev 5.
How many analog-to-digital converters does the STM32L475RCT7 include, and what are their key specifications?
The device includes three independent 12-bit ADCs, each capable of 5 Msps sampling rate. With hardware oversampling, effective resolution reaches 16 bits. Total power consumption is 200 µA/Msps, and all ADCs share common calibration and VREFINT reference. These specifications are confirmed in Sections 3.15 and 6.3.18 of DS10969 Rev 5.
What low-power modes are available, and what is the lowest achievable current draw?
The STM32L475RCT7 offers five low-power modes: Shutdown (30 nA), Standby (120 nA), Stop 2 (1.1 µA), Stop 1 (1.4 µA with RTC), and Stop 0 (2.3 µA). The 30 nA Shutdown current is measured with VBAT supplied and all regulators disabled, per Table 4 and Section 3.9.4 of DS10969 Rev 5 - making it suitable for decade-long battery operation in maintenance-free sensors.
STM32L475RCT7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STM32L4
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M4
- Core Size:
- 32-Bit Single-Core
- Speed:
- 80MHz
- Connectivity:
- CANbus, I2C, IrDA, LINbus, MMC/SD, QSPI, SAI, SPI, SWPMI, UART/USART, USB OTG
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 51
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 128K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.71V ~ 3.6V
- Data Converters:
- A/D 16x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L475RCT7 FAQ
1.How can I place an order for STM32L475RCT7 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L475RCT7 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STM32L475RCT7 reliable?
The price and inventory of STM32L475RCT7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L475RCT7 is usually 5 days.
3.What payment methods are accepted for STM32L475RCT7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L475RCT7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L475RCT7?
STM32L475RCT7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L475RCT7 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STM32L475RCT7?
For technical support, including STM32L475RCT7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L475RCT7 requirements.
6.How does Aetrix verify that STM32L475RCT7 is sourced from the original manufacturer or authorized distributors?
All STM32L475RCT7 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM32L475RCT7 meets industry standards.
7.What is the process for return or replacement of STM32L475RCT7?
All STM32L475RCT7 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L475RCT7, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STM32L475RCT7 part is unused and in its original packaging.
Return procedure for STM32L475RCT7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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