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STMicroelectronics STM32L471RET6
- Part No.:
- STM32L471RET6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM32L471RET6.pdf
- Description:
- IC MCU 32BIT 512KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:8,177
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Product details
Overview
STM32L471RET6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 512 KB Flash, 128 KB SRAM, and integrated analog peripherals including dual 12-bit DACs, triple 12-bit ADCs, two op-amps, and two ultra-low-power comparators. It targets battery-powered IoT edge nodes, portable medical sensors, and energy-harvesting wearables requiring sub-µA standby operation and robust mixed-signal processing.
For engineers reviewing the STM32L471RET6 datasheet, STM32L471RET6 pinout, STM32L471RET6 application, or STM32L471RET6 equivalent, key selection criteria include its 30 nA shutdown current, 420 nA RTC-enabled standby, dual SAIs for audio streaming, CAN 2.0B interface, and LQFP64 package compatibility with space-constrained PCB layouts.
Technical Context
The device implements FlexPowerControl architecture with seven low-power modes (Shutdown, Standby, Stop 0/1/2, Sleep, Run), enabling dynamic voltage scaling and clock gating per peripheral domain. Its ART Accelerator™ delivers zero-wait-state execution from Flash at 80 MHz, while the interconnect matrix decouples bus arbitration for concurrent DMA and CPU access to memory and peripherals.
Core timing relies on three independent PLLs - system (up to 80 MHz), audio (for SAI clock generation), and ADC (for precise sampling synchronization) - supported by four clock sources: HSE (4–48 MHz), LSE (32.768 kHz), HSI16 (±1%), and auto-trimmed MSI (100 kHz–48 MHz, ±0.25%).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M4 with FPU and MPU; enables real-time DSP algorithms and secure task isolation in RTOS environments. |
| Max Clock | 80 MHz (100 DMIPS); supports high-throughput sensor fusion and audio preprocessing without external co-processors. |
| Flash / SRAM | 512 KB Flash (2-bank RWW), 128 KB SRAM (32 KB with parity); allows firmware OTA updates and safety-critical data buffering with error detection. |
| Low-Power Modes | 30 nA Shutdown, 420 nA Standby+RTC, 1.1 µA Stop 2; extends coin-cell battery life to >10 years in periodic wake-up sensing applications. |
| Analog Peripherals | 3×12-bit ADC (5 Msps), 2×12-bit DAC, 2×op-amp (with PGA), 2×comparator; supports closed-loop analog signal conditioning and sensor excitation without external components. |
| Communication | 2×SAI, 5×USART, 1×LPUART, 3×I²C, 3×SPI, CAN 2.0B, SDMMC, SWPMI; enables simultaneous audio streaming, BLE host control, and industrial fieldbus connectivity. |
| Timers | 16 timers including 2×advanced-control (TIM1/TIM8), 2×low-power (LPTIM1/LPTIM2 active in Stop mode); supports motor control PWM, precise RTC wake-up, and duty-cycled sensor polling. |
Pinout & Package
LQFP64 (10 × 10 mm, 0.5 mm pitch) package with 51 general-purpose I/Os - 45 of which are 5 V-tolerant and support independent supply down to 1.08 V for multi-rail system interfacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Main power supply and ground | Supports 1.71–3.6 V operation; decoupling required per STM32L4 layout guidelines to maintain ADC/DAC accuracy. |
| VREF+ | Analog reference input | Accepts external 1.2–3.6 V reference or internal VREFINT (1.21 V) for ADC/DAC full-scale calibration. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15, PE0–PE15 | General-purpose I/Os | Configurable as GPIO, AF functions (e.g., USART_TX/RX, SPI_SCK/MOSI), or analog inputs; most support wakeup from low-power modes. |
| OSC_IN / OSC_OUT | HSE crystal oscillator terminals | Drive 4–48 MHz quartz; essential for USB/CAN timing accuracy and high-precision RTC calibration. |
| BOOT0 | Boot mode selection | Pulled low for main Flash boot; used during factory programming or recovery via system memory bootloader. |
Key Features
| Feature | Design Value |
|---|---|
| FlexPowerControl architecture | Enables granular power gating per peripheral cluster, reducing active current to 100 µA/MHz and enabling sub-µA retention in Stop 2 mode. |
| ART Accelerator™ | Eliminates Flash wait states at 80 MHz, delivering deterministic 1.25 DMIPS/MHz performance without SRAM code shadowing. |
| Dual SAIs with FIFO and clock generators | Supports I²S/TDM audio streaming to external codecs or MEMS microphones with independent master/slave clocking and DMA-driven buffer management. |
| Capacitive touch sensing (TSC) | 24-channel hardware-accelerated touch controller supporting touchkey, linear slider, and rotary encoder with <1 µA active current and noise immunity up to 50 Vpp. |
| True random number generator (RNG) | FIPS-compliant entropy source certified per ISO/IEC 19790; used for secure key generation in TLS handshake and firmware signing. |
Applications
| Wearable Health Monitor | Smart Utility Meter |
|---|---|
Use Scenario: Continuous ECG/PPG acquisition with motion artifact compensation and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Central MCU executing sensor fusion (CMSIS-DSP), managing dual ADC oversampling, driving OLED via SPI, and handling LPUART-to-BLE bridge. Use Value: 420 nA Standby+RTC enables 7-day battery life on CR2032; dual op-amps condition analog front-end signals without external gain stages. | Use Scenario: Tamper-resistant electricity meter with metrology-grade sampling, secure firmware updates, and PLC/GPRS backhaul. IC Role / Device Role / Timing Role: Metrology controller interfacing with ΣΔ ADC via DFSDM, running IEC 62056 protocol stack, and managing CAN-based local network communication. Use Value: 30 nA Shutdown mode preserves RTC and backup registers during mains failure; embedded CRC unit validates firmware integrity before execution. |
| Industrial Wireless Sensor Node | Audio-Enabled Smart Home Hub |
Use Scenario: Battery-powered vibration/temperature node transmitting time-synchronized FFT data over LoRaWAN. IC Role / Device Role / Timing Role: Real-time FFT processor using CMSIS-DSP, low-power timer-triggered ADC sampling, and CAN-to-LoRaWAN gateway via UART + SX1276. Use Value: 1.1 µA Stop 2 mode with 4 µs wakeup ensures sub-100 µs latency for event-driven sampling; 16-bit hardware oversampling improves SNR by 12 dB over standard 12-bit ADC. | Use Scenario: Voice-controlled hub aggregating Zigbee/Z-Wave devices and streaming local music via I²S to DAC + Class D amplifier. IC Role / Device Role / Timing Role: Audio subsystem controller managing dual SAI interfaces (one for mic array, one for speaker output), DAC sample-and-hold, and USB HID command parsing. Use Value: Dual SAIs eliminate external audio codec; built-in 12-bit DAC supports 48 kHz stereo playback with <−70 dB THD+N, reducing BOM cost by $0.85. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L432KCU6 | 48-pin UFBGA, 256 KB Flash, no SAI or CAN, single ADC, lower I/O count (25) | Suitable for cost-sensitive, size-constrained sensor endpoints without audio or fieldbus needs | Select when footprint and BOM cost outweigh need for dual SAIs, CAN, or >300 KB Flash. |
| STM32L552RET6 | ARM TrustZone®, 32 KB SRAM with ECC, 512 KB Flash with HW crypto accelerator, 1.5x higher active power | Required for PSA Level 3-certified secure boot, encrypted firmware storage, and secure element offload | Select when hardware-enforced security isolation and AES-256/GCM acceleration are mandatory for cloud-connected devices. |
Compared with STM32L432KCU6, the STM32L471RET6 provides richer analog integration and fieldbus support at modest cost premium; versus STM32L552RET6, it trades hardware security for lower power and simpler certification path in non-regulated consumer applications.
Availability
STM32L471RET6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and audio-enabled smart home hubs requiring stable component supply across multi-year production cycles.
Supply support for STM32L471RET6 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, specializing in microcontrollers, power management, and analog/mixed-signal ICs for industrial, automotive, and consumer markets.
The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, with design focus on extended battery life, rich analog integration, and seamless connectivity for IoT edge devices.
FAQ
What is the maximum operating temperature range for STM32L471RET6?
The STM32L471RET6 is qualified for industrial operation from −40 °C to +105 °C ambient temperature. This rating is confirmed in Section 6.3.1 of DS10741 Rev 3 and applies to all LQFP64 variants. The device maintains full Flash/SRAM functionality and analog accuracy within this range, with thermal derating not required up to 105 °C.
Does STM32L471RET6 support hardware encryption acceleration?
No, STM32L471RET6 does not include dedicated cryptographic accelerators (AES, PKA, HASH). It relies on software libraries (STM32CubeL4 Crypto) for encryption. For hardware-accelerated crypto, ST recommends STM32L552RET6 (AES-256/GCM/SHA-256) or STM32U575/585 series with ARM CryptoCell-312.
Can the internal 32 kHz RC oscillator be used for RTC calibration?
Yes, the internal low-power 32 kHz RC (LPRC) can drive the RTC in Standby/Stop modes, but its ±5% accuracy makes it unsuitable for timekeeping without periodic correction. For precise RTC operation, the external 32.768 kHz crystal (LSE) is required - its stability (±20 ppm) enables calendar accuracy within ±1 second per day.
How many I/O pins support independent VDDIO2 supply?
14 I/O pins (PA[0..3], PB[0..1], PC[0..5], PD[2..3]) support independent VDDIO2 supply down to 1.08 V, enabling direct interfacing with 1.2 V or 1.8 V logic domains while main VDD operates at 3.3 V. This is documented in Section 3.12 and Table 16 of DS10741 Rev 3.
STM32L471RET6 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, EBI/EMI, I2C, IrDA, LINbus, MMC/SD, QSPI, SAI, SPI, SWPMI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, PWM, WDT
- Number of I/O:
- 51
- Program Memory Size:
- 512KB (512K 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L471RET6 FAQ
1.How can I place an order for STM32L471RET6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L471RET6 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 STM32L471RET6 reliable?
The price and inventory of STM32L471RET6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L471RET6 is usually 5 days.
3.What payment methods are accepted for STM32L471RET6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L471RET6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L471RET6?
STM32L471RET6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L471RET6 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 STM32L471RET6?
For technical support, including STM32L471RET6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L471RET6 requirements.
6.How does Aetrix verify that STM32L471RET6 is sourced from the original manufacturer or authorized distributors?
All STM32L471RET6 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 STM32L471RET6 meets industry standards.
7.What is the process for return or replacement of STM32L471RET6?
All STM32L471RET6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L471RET6, 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 STM32L471RET6 part is unused and in its original packaging.
Return procedure for STM32L471RET6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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