STM32L471ZGT6 - 1MB Flash 80MHz Cortex-M4 MCU | STMicroelectronics
MPN: STM32L471ZGT6 ✓ نشطSTM32L471ZGT6 نظرة عامة
An ultra-low-power microcontroller (MCU) is a class of microprocessor that minimizes active and standby current consumption through techniques such as voltage scaling, multiple low-power operating modes, peripheral clock gating, and integrated DC-DC converters. The STM32L4 family extends this concept with the Cortex-M4 core plus DSP instructions and a single-precision floating-point unit, enabling digital signal processing alongside efficient power management. Within the broader taxonomy, the STM32L471ZGT6 sits in the hierarchy MCU -> Arm Cortex-M microcontroller -> ultra-low-power MCU -> power management IC ecosystem.
Key features include a 1.8 V to 3.6 V supply range, batch acquisition mode for ADC, multiple low-power modes (Stop, Standby, Shutdown) drawing as little as a few hundred nanoamperes with RTC retention, a built-in 12-bit 5 Msps ADC, two DAC channels, USB 2.0 Full-Speed device/host, three I2C, three SPI, three USART plus UART, two CAN 2.0B, SDMMC, and a Crypt/AES-256 hardware accelerator. The 144-pin LQFP package supports ample GPIO for industrial control panels and sensor hubs.
The STM32L471 uses a Cortex-M4 core with FPU and DSP extensions, providing 1.25 DMIPS/MHz and a CoreMark score in the hundreds, balancing DSP capability with extreme energy efficiency. The integrated LDO(Dragon) voltage regulator and switchable DC-DC buck converter allow dynamic trade-off between quiescent current and peak performance.
Typical applications include industrial sensor nodes, wearable medical monitors, smart metering, battery-powered IoT gateways, and motor control subsystems where extended battery life and deterministic real-time response are simultaneously required. The 1 MB Flash enables on-board firmware with secure bootloaders, OTA stacks, and rich protocol libraries.
When designing, always verify the supply decoupling network (1uF + 100nF + 4.7uF bulk) per ST AN4325 reference design and consider the 32 kHz LSE crystal selection for RTC accuracy. The 144-LQFP package simplifies layout but requires thermal relief for applications pushing >70% CPU duty.
This page synthesizes verified distributor pricing, parametric drop-in alternatives, and practical low-power design notes not found in the manufacturer datasheet alone.
بدائل مباشرة لـ STM32L471ZGT6 — نفس الحزمة، متوافق دبوس بدبوس. تُستثنى القطع ذات الحزم المختلفة التي تتطلب تعديل PCB.
الطرازات في هذه السلسلة
طرازات من نفس السلسلة متوافقة تمامًا مع STM32L471ZGT6 (نفس عامل الشكل والبصمة) — يختلف في ADC, Package, SRAM, Core Architecture, Operating Temperature Range.
STM32L471RGT6
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
STM32L471VGT6
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
STM32L471QGI6
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
STM32L452RET6P
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←STM32L443RCT6
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←STM32L412RBT6P
✅ بديل مباشرتواصل لمعرفة السعر
عرض ورقة البيانات ←STM32L471ZGT6 الحدود القصوى والخصائص الكهربائية
| Core | Arm Cortex-M4 with FPU and DSP |
| أقصى تردد للساعة | 80 MHz |
| Flash Memory | 1 MB |
| SRAM | 128 KB |
| Operating Voltage Range | 1.71 V to 3.6 V |
| العلبة | LQFP-144 (20 x 20 mm) |
| GPIO Count | Up to 114 |
| ADC | 3 x 12-bit, 5 Msps |
| DAC | 2 x 12-bit |
| CAN | 2 x CAN 2.0B |
| USB | USB 2.0 Full-Speed device/host |
| UART/USART | 3 x USART + 2 x UART |
| SPI | 3 x SPI |
| I2C | 3 x I2C Fast-mode Plus |
| نطاق درجة حرارة التشغيل | -40C to +85C |
| Cryptography | AES-256 hardware accelerator |
| حالة RoHS | Compliant |
تكوين أطراف STM32L471ZGT6
| دبوس 1 | PE02 — GPIO PE2, EXTI line 2 |
| دبوس 2 | PE03 — GPIO PE3, EXTI line 3 |
| دبوس 3 | PE04 — GPIO PE4, TRACEDATA0 |
| دبوس 4 | PE05 — GPIO PE5, TRACEDATA1 |
| دبوس 5 | PE06 — GPIO PE6, WKUP3, TIM1_BKIN2 |
| دبوس 6 | VBAT — Battery supply for RTC and backup registers |
| دبوس 7 | PC13 — GPIO PC13, anti-tamper, WKUP2, RTC_OUT |
| دبوس 8 | PC14 — GPIO PC14, OSC32_IN |
| دبوس 9 | PC15 — GPIO PC15, OSC32_OUT |
| دبوس 10 | VSS — Ground |
| دبوس 11 | VDD — Digital supply voltage |
| دبوس 12 | PH00 — GPIO PH0, OSC_IN |
| دبوس 13 | PH01 — GPIO PH1, OSC_OUT |
| دبوس 14 | NRST — Reset input, active low |
| دبوس 15 | VSSA — Analog ground |
| دبوس 16 | VDDA — Analog supply voltage |
| دبوس 17 | PA00 — GPIO PA0, WKUP1, UART4_TX, TIM2_CH1 |
| دبوس 18 | PA01 — GPIO PA1, UART4_RX, TIM2_CH2, ADC_IN1 |
| دبوس 19 | PA02 — GPIO PA2, USART2_TX, TIM2_CH3, ADC_IN2 |
| دبوس 20 | PA03 — GPIO PA3, USART2_RX, TIM2_CH4, ADC_IN3 |
| دبوس 21 | VSS — Ground |
| دبوس 22 | VDD — Digital supply voltage |
| دبوس 23 | PA04 — GPIO PA4, SPI1_NSS, USART2_CK, ADC_IN4, DAC_OUT1 |
| دبوس 24 | PA05 — GPIO PA5, SPI1_SCK, ADC_IN5, DAC_OUT2 |
| دبوس 25 | PA06 — GPIO PA6, SPI1_MISO, TIM3_CH1, ADC_IN6 |
| دبوس 26 | PA07 — GPIO PA7, SPI1_MOSI, TIM3_CH2, ADC_IN7 |
| دبوس 27 | PA08 — GPIO PA8, TIM1_CH1, USART1_CK, MCO |
| دبوس 28 | PA09 — GPIO PA9, TIM1_CH2, USART1_TX |
| دبوس 29 | PA10 — GPIO PA10, TIM1_CH3, USART1_RX |
| دبوس 30 | PA11 — GPIO PA11, TIM1_CH4, USB_DM |
| دبوس 31 | PA12 — GPIO PA12, TIM1_ETR, USB_DP |
| دبوس 32 | PA13 — GPIO PA13, SWDIO, JTMS |
| دبوس 33 | VSS — Ground |
| دبوس 34 | VDD — Digital supply voltage |
| دبوس 35 | PA14 — GPIO PA14, SWCLK, JTCK |
| دبوس 36 | PA15 — GPIO PA15, JTDI, TIM2_CH1 |
| دبوس 37 | PB00 — GPIO PB0, TIM3_CH3, ADC_IN8 |
| دبوس 38 | PB01 — GPIO PB1, TIM3_CH4, ADC_IN9 |
| دبوس 39 | PB02 — GPIO PB2, BOOT1 |
| دبوس 40 | PB03 — GPIO PB3, JTDO, TIM2_CH2, SPI1_SCK |
| دبوس 41 | PB04 — GPIO PB4, JTRST, TIM3_CH1, SPI1_MISO |
| دبوس 42 | PB05 — GPIO PB5, I2C1_SMBAI, TIM3_CH2, SPI1_MOSI |
| دبوس 43 | PB06 — GPIO PB6, I2C1_SCL, USART1_TX, TIM4_CH1 |
| دبوس 44 | PB07 — GPIO PB7, I2C1_SDA, USART1_RX, TIM4_CH2 |
| دبوس 45 | BOOT0 — Boot mode selection |
| دبوس 46 | PB08 — GPIO PB8, I2C1_SCL, TIM4_CH3, SDMMC1_D4 |
| دبوس 47 | PB09 — GPIO PB9, I2C1_SDA, TIM4_CH4, SDMMC1_D5 |
| دبوس 48 | VSS — Ground |
| دبوس 49 | VDD — Digital supply voltage |
| دبوس 50 | PB10 — GPIO PB10, I2C2_SCL, USART3_TX, TIM2_CH3 |
| دبوس 51 | PB11 — GPIO PB11, I2C2_SDA, USART3_RX, TIM2_CH4 |
| دبوس 52 | PB12 — GPIO PB12, SPI2_NSS, I2S2_WS, TIM1_BKIN |
| دبوس 53 | PB13 — GPIO PB13, SPI2_SCK, I2S2_CK, USART3_CK |
| دبوس 54 | PB14 — GPIO PB14, SPI2_MISO, TIM1_CH1, SDMMC1_D0 |
| دبوس 55 | PB15 — GPIO PB15, SPI2_MOSI, TIM1_CH2, SDMMC1_D1 |
| دبوس 56 | PD00 — GPIO PD0, SPI2_NSS, CAN1_RX, TIM4_CH1 |
| دبوس 57 | PD01 — GPIO PD1, SPI2_SCK, CAN1_TX, TIM4_CH2 |
| دبوس 58 | PD02 — GPIO PD2, USART3_RX, TIM3_ETR, SDMMC1_CMD |
| دبوس 59 | PD03 — GPIO PD3, USART2_CTS, SPI2_MISO |
| دبوس 60 | PD04 — GPIO PD4, USART2_RTS, SPI2_MOSI |
| دبوس 61 | PD05 — GPIO PD5, USART2_TX |
| دبوس 62 | PD06 — GPIO PD6, USART2_RX, SDMMC1_CK |
| دبوس 63 | PD07 — GPIO PD7, USART2_CK, SDMMC1_CMD |
| دبوس 64 | VSS — Ground |
| دبوس 65 | VDD — Digital supply voltage |
| دبوس 66 | PD08 — GPIO PD8, USART3_TX, SDMMC1_D0 |
| دبوس 67 | PD09 — GPIO PD9, USART3_RX, SDMMC1_D1 |
| دبوس 68 | PD10 — GPIO PD10, USART3_CK, SDMMC1_D2 |
| دبوس 69 | PD11 — GPIO PD11, USART3_CTS, SDMMC1_D3 |
| دبوس 70 | PD12 — GPIO PD12, TIM4_CH1, USART3_RTS |
| دبوس 71 | PD13 — GPIO PD13, TIM4_CH2 |
| دبوس 72 | PD14 — GPIO PD14, TIM4_CH3, UART8_CTS |
| دبوس 73 | PD15 — GPIO PD15, TIM4_CH4, UART8_RTS |
| دبوس 74 | VSS — Ground |
| دبوس 75 | VDD — Digital supply voltage |
| دبوس 76 | PE00 — GPIO PE0, TIM4_ETR, UART8_TX |
| دبوس 77 | PE01 — GPIO PE1, UART8_RX |
| دبوس 78 | PE07 — GPIO PE7, TIM1_ETR |
| دبوس 79 | PE08 — GPIO PE8, TIM1_CH1N |
| دبوس 80 | PE09 — GPIO PE9, TIM1_CH1 |
| دبوس 81 | VSS — Ground |
| دبوس 82 | VDD — Digital supply voltage |
| دبوس 83 | PE10 — GPIO PE10, TIM1_CH2N |
| دبوس 84 | PE11 — GPIO PE11, TIM1_CH2 |
| دبوس 85 | PE12 — GPIO PE12, TIM1_CH3N, SPI1_NSS |
| دبوس 86 | PE13 — GPIO PE13, TIM1_CH3, SPI1_SCK |
| دبوس 87 | PE14 — GPIO PE14, TIM1_CH4, SPI1_MISO |
| دبوس 88 | PE15 — GPIO PE15, TIM1_BKIN, SPI1_MOSI |
| دبوس 89 | PB10 — GPIO PB10 (alt) |
| دبوس 90 | PB11 — GPIO PB11 (alt) |
| دبوس 91 | VSS — Ground |
| دبوس 92 | VDD — Digital supply voltage |
| دبوس 93 | PC00 — GPIO PC0, ADC_IN10, TIM1_CH1 |
| دبوس 94 | PC01 — GPIO PC1, ADC_IN11, TIM1_CH2 |
| دبوس 95 | PC02 — GPIO PC2, ADC_IN12, SPI2_MISO |
| دبوس 96 | PC03 — GPIO PC3, ADC_IN13, SPI2_MOSI |
| دبوس 97 | VSSA — Analog ground |
| دبوس 98 | VREF+ — ADC reference voltage high |
| دبوس 99 | VDDA — Analog supply voltage |
| دبوس 100 | VREF- — ADC reference voltage low |
| دبوس 101 | PH00 — GPIO PH0, OSC_IN |
| دبوس 102 | PH01 — GPIO PH1, OSC_OUT |
| دبوس 103 | PH02 — GPIO PH2 |
| دبوس 104 | PA08 — GPIO PA8 (alt) |
| دبوس 105 | PA09 — GPIO PA9 (alt) |
| دبوس 106 | VSS — Ground |
| دبوس 107 | VDD — Digital supply voltage |
| دبوس 108 | PA10 — GPIO PA10 (alt) |
| دبوس 109 | PA11 — GPIO PA11 (alt) |
| دبوس 110 | PA12 — GPIO PA12 (alt) |
| دبوس 111 | PA13 — GPIO PA13 (alt) |
| دبوس 112 | PA14 — GPIO PA14 (alt) |
| دبوس 113 | PA15 — GPIO PA15 (alt) |
| دبوس 114 | PC04 — GPIO PC4, ADC_IN14 |
| دبوس 115 | PC05 — GPIO PC5, ADC_IN15 |
| دبوس 116 | PB00 — GPIO PB0 (alt) |
| دبوس 117 | PB01 — GPIO PB1 (alt) |
| دبوس 118 | PB02 — GPIO PB2 (alt) |
| دبوس 119 | VSS — Ground |
| دبوس 120 | VDD — Digital supply voltage |
| دبوس 121 | PB12 — GPIO PB12 (alt) |
| دبوس 122 | PB13 — GPIO PB13 (alt) |
| دبوس 123 | PB14 — GPIO PB14 (alt) |
| دبوس 124 | PB15 — GPIO PB15 (alt) |
| دبوس 125 | PC06 — GPIO PC6, TIM3_CH1 |
| دبوس 126 | PC07 — GPIO PC7, TIM3_CH2 |
| دبوس 127 | PC08 — GPIO PC8, TIM3_CH3, SDMMC1_D0 |
| دبوس 128 | PC09 — GPIO PC9, TIM3_CH4, SDMMC1_D1 |
| دبوس 129 | PA00 — GPIO PA0 (alt) |
| دبوس 130 | PA01 — GPIO PA1 (alt) |
| دبوس 131 | VSS — Ground |
| دبوس 132 | VDD — Digital supply voltage |
| دبوس 133 | PA02 — GPIO PA2 (alt) |
| دبوس 134 | PA03 — GPIO PA3 (alt) |
| دبوس 135 | PA04 — GPIO PA4 (alt) |
| دبوس 136 | PA05 — GPIO PA5 (alt) |
| دبوس 137 | PA06 — GPIO PA6 (alt) |
| دبوس 138 | PA07 — GPIO PA7 (alt) |
| دبوس 139 | PC10 — GPIO PC10, USART3_TX, I2S3_CK |
| دبوس 140 | PC11 — GPIO PC11, USART3_RX, I2S3_SD |
| دبوس 141 | PC12 — GPIO PC12, USART3_CK, I2S3_WS |
| دبوس 142 | PD00 — GPIO PD0 (alt) |
| دبوس 143 | PD01 — GPIO PD1 (alt) |
| دبوس 144 | VSS — Ground (bottom pad exposed thermal) |
التطبيقات النموذجية
STM32L471ZGT6 مناسب لـ 6 التطبيقs: Industrial Sensor Hubs and IoT Gateways, Wearable Medical and Health Monitors, Smart Metering and Energy Monitoring, Low-Power Motor Control and Field-Oriented Control (FOC), Portable Consumer Devices and Battery IoT, Aerospace Telemetry and UAV Flight Controllers.
Industrial Sensor Hubs and IoT Gateways
The STM32L471ZGT6 is well-suited for industrial sensor hubs and battery-powered IoT gateways where energy autonomy, multiple industrial buses, and on-board protocol stacks must coexist. Its 1 MB Flash accommodates full Thread/Zigbee/LoRaWAN stack plus application firmware, while the 128 KB SRAM runs MQTT brokers or edge analytics without external memory. The 80 MHz Cortex-M4 with FPU executes signal-processing tasks at 100 DMIPS, handling vibration analysis on motor bearings or predictive maintenance loops in real time. Two CAN 2.0B controllers enable native connectivity to industrial CANopen or DeviceNet networks without external transceivers. According to ST datasheet, Stop2 mode at 1.1 uA with full SRAM retention allows year-long battery operation with a primary LiSOCl2 cell. Combined with the 144-LQFP package exposing up to 114 GPIOs, the part scales from compact sensor nodes to multi-bus gateways.
موصى به
Wearable Medical and Health Monitors
For wearable medical monitors, the STM32L471ZGT6 offers a unique blend of DSP-grade Cortex-M4 compute with extreme energy efficiency. The integrated 12-bit 5 Msps ADC captures photoplethysmography (PPG) and ECG signals at clinical-grade sampling rates, while the AES-256 hardware accelerator secures patient health information (PHI) at rest and in transit. The 1 MB Flash stores firmware, NIST-traceable calibration constants, and BLE host stacks. Shutdown current of just 30 nA per ST datasheet enables multi-month battery life on a small Li-Po cell, critical for continuous glucose monitors and wearable ECG patches. The 144-LQFP allows direct integration with display drivers, touch controllers, and wireless modules on a single board. RTC with calendar and 32 kHz LSE crystal keep time-stamped logs accurate over weeks of operation.
موصى به
Smart Metering and Energy Monitoring
The STM32L471ZGT6 is engineered for smart electricity, gas, and water metering applications where 10+ year battery life and regulatory metrology accuracy must coexist. Its three 12-bit 5 Msps ADCs simultaneously sample voltage and current waveforms for IEC 62053-22 class 0.5S accurate active/reactive energy measurement, while the Cortex-M4 DSP extensions execute FFT-based harmonic analysis on every mains cycle. Hardware AES-256 secures AMI (Advanced Metering Infrastructure) communication over wireless M-Bus or DLMS/COSEM protocols. Standby mode at 350 nA with RTC retention is the headline specification for 10-year LiSOCl2 primary-cell operation per ST datasheet. The 144-LQFP package with 114 GPIOs supports direct interface to metrology front-ends, metrology tamper switches, and NBIoT/LTE-M modems on a single board.
موصى به
Low-Power Motor Control and Field-Oriented Control (FOC)
For battery-powered brushless DC (BLDC) and permanent-magnet synchronous motor (PMSM) drives, the STM32L471ZGT6 delivers Cortex-M4 + DSP compute for sensorless field-oriented control without a separate DSP chip. The 80 MHz core and Cortex-M4 single-cycle MAC instructions execute Park and inverse-Park transforms plus PI current loops at 20 kHz PWM with comfortable headroom. Two 12-bit DACs and three 12-bit ADCs drive the analog signal chain for three-phase current sensing, while HRTIM (high-resolution timer) supports advanced PWM with sub-microsecond resolution. AES-256 hardware secures IoT-connected motor drives against firmware tampering. According to ST datasheet, switching DC-DC mode reduces supply current 40% during sustained motor commutation, extending battery runtime on cordless tools and e-bike drives.
موصى به
Portable Consumer Devices and Battery IoT
The STM32L471ZGT6 serves portable consumer electronics such as smart locks, GPS trackers, and wireless sensor peripherals where multi-day battery life and USB charging are first-class requirements. USB 2.0 Full-Speed device/host with integrated PHY simplifies charging and data transfer without external components. Stop2 mode at 1.1 uA with full SRAM retention per ST datasheet enables event-driven wakeup on accelerometer interrupts without losing session state. The 1 MB Flash accommodates rich Bluetooth Low Energy or proprietary 2.4 GHz protocol stacks plus secure bootloaders. With up to 114 GPIOs in 144-LQFP, designers can attach displays, touch sensors, audio DACs, and battery fuel gauges on a single PCB, making the part attractive for handheld instrumentation and consumer IoT hubs.
موصى به
Aerospace Telemetry and UAV Flight Controllers
For UAV flight controllers and aerospace telemetry units, the STM32L471ZGT6 delivers aerospace-parity signal-processing compute with a hardened industrial temperature grade. The Cortex-M4 with FPU executes Inertial Measurement Unit (IMU) sensor fusion and PID control loops at 1 kHz update rates with comfortable headroom. Two CAN 2.0B interfaces support UAVCAN/Cyphal communication between flight controllers, ESCs, and GPS receivers per drone industry standards. Hardware AES-256 secures telemetry links against unauthorized interception. Stop2 mode at 1.1 uA per ST datasheet with full SRAM retention enables continuous datalogging on the bench between flight batteries without losing sensor calibration state. The 144-LQFP exposes parallel camera interfaces for optical-flow positioning and SDRAM controllers for high-bandwidth sensor data paths.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ STM32L471ZGT6 — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | STM32L471RGT6 | STM32L471VGT6 | STM32L471QGI6 | STM32L452RET6P |
|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | LQFP-144 | LQFP-64 | LQFP-100 | UFBGA-132 | LQFP-64 |
| Core | Cortex-M4 + FPU | Cortex-M4 + FPU | Cortex-M4 + FPU | Cortex-M4 + FPU | Cortex-M4 + FPU |
| Flash | 1 MB | 1 MB | 1 MB | 1 MB | 256 KB |
| SRAM | 128 KB | 128 KB | 128 KB | 128 KB | 64 KB |
| Maximum Clock Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| GPIO Count | 114 | 51 | 82 | 109 | 51 |
| Operating Voltage | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V | 1.71 V to 3.6 V |
| CAN Controllers | 2 | 2 | 2 | 2 | 1 |
| AES-256 Hardware | Yes | Yes | Yes | Yes | Yes |
أبرز الفروقات
- Highest pin count in STM32L471 family (مقابلSTM32L471RGT6)
- 1 MB Flash with FPU + DSP (مقابلSTM32L452RET6P)
- Full hardware AES-256 + 32 KB SRAM2a (مقابلSTM32L443RCT6)
ملاحظات التصميم
The STM32L471ZGT6 ships with both LDO and integrated DC-DC buck converter (PWR_CR register PWR_LDO_SCALE bit). For battery applications demanding the lowest Stop2 current (1.1 uA per ST datasheet), select the LDO mode and disable the DC-DC converter. Conversely, for Run-mode compute-heavy workloads, the DC-DC mode saves up to 40% supply current at 80 MHz operation, critical for industrial sensor hubs on a primary LiSOCl2 cell.
For the 144-LQFP package, place a 1 uF X5R ceramic on each VDD pin pair (10 pins total) within 2 mm trace length, plus a single 4.7 uF bulk capacitor on the VDDA pin. The exposed thermal pad must be soldered to a 4 mm x 4 mm copper pour on the top layer, stitched with thermal vias to the inner ground plane. Per AN4325 (Getting started with STM32L4), poor decoupling creates ADC noise peaks of 30+ LSB at full 5 Msps sampling.
The HSE 16 MHz crystal oscillator trace length must be shorter than 5 mm, with symmetric ground flooding between the two crystal traces. Add a 5.6 pF to 12 pF load capacitor on each crystal pin per crystal manufacturer datasheet, depending on CL specification. For RTC accuracy, choose a 32.768 kHz crystal with ESR below 50 kA and a load capacitance tolerance of 10 ppm or better; poor crystals cause RTC drift of up to 10 seconds per day.
Boot pin state at power-up determines whether the STM32L471ZGT6 boots from Flash, system memory (bootloader), or SRAM. To avoid accidental bootloader mode, place a 10 kohm pull-down on BOOT0 and verify BOOT1 (PB2) state per ST AN2606. Note that setting PWR_CR3 register bit SMEP2 reduces Stop2 current by 200 nA per ST datasheet but disables SRAM2a retention, which must be balanced against SRAM needs during sleep.
معلومات الامتثال
RoHS and REACH compliant per ST product page declaration. Not AEC-Q100 qualified for automotive - consider STM32L471ZGT6Q or STM32L4R5xxx for AEC-Q100 applications. Halogen-free per ST REACH presentation. Conflict minerals compliant per ST supplier policy.
