STM32L412CBU6 - 80MHz Cortex-M4 128KB Flash MCU | STMicroelectronics
MPN: STM32L412CBU6 ✓ نشطSTM32L412CBU6 نظرة عامة
An ARM Cortex-M4 microcontroller is a 32-bit RISC processor core designed for embedded systems, combining high computational performance with low power consumption. The Cortex-M4 specifically adds a single-precision floating-point unit (FPU) and DSP extensions, making it suitable for signal-processing tasks. The STM32L4 family further extends the architecture with ultra-low-power techniques (FlexPowerControl), placing it in the broader hierarchy of microcontroller -> embedded processor -> semiconductor device, optimized for IoT and wearable segments.
Key features include a Cortex-M4 core with FPU delivering 100 DMIPS, 128 KB Flash with ECC, 40 KB SRAM, USB 2.0 Full-Speed with crystal-less operation, two DACs, one 12-bit ADC (5 Msps), two comparators, two operational amplifiers, and a built-in SMPS step-down converter for internal core supply. The UFQFPN-48 footprint integrates 38 GPIO pins supporting I2C, SPI, USART, LPUART, USB and CAN interfaces.
The SMPS bypass mode enables direct core supply from a coin-cell or super-capacitor backup domain, while the VBAT mode retains 32x32-bit backup registers and the RTC drawing only 300 nA. Housed in a UFQFPN-48 package with a small 7x7 mm body, the device also features a true random number generator (TRNG), 128-bit AES hardware accelerator, and capacitive touch sensing support.
Typical applications include wearable health sensors, low-end smart watches, industrial sensor nodes, USB-powered devices, smart metering, and battery-powered IoT endpoints. The combination of Cortex-M4 performance and sub-microamp standby modes makes the part particularly suited to products that wake briefly to perform a measurement, then return to deep sleep.
When laying out the PCB, ensure the UFQFPN-48 exposed pad is soldered to a properly sized ground plane with thermal vias to limit junction temperature. Decouple VDD with 100 nF + 1 uF ceramics close to each supply pin, and follow ST reference designs for the SMPS inductor selection if the internal regulator is used.
بدائل مباشرة لـ STM32L412CBU6 — 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 STM32L412CBU6 (نفس عامل الشكل والبصمة) — يختلف في Package, SRAM, Maximum Clock Frequency, ADC, Communication Interfaces.
STM32L432KBU6
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
STM32L422CBT6
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
STM32L433CCU6
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
STM32L431CCU6
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
STM32L452CEU6
✅ بديل مباشر📋 بديل مرجعي (غير موجود في الكتالوج)
STM32L412CBU6 الحدود القصوى والخصائص الكهربائية
| Core Architecture | ARM Cortex-M4 with FPU (32-bit) |
| أقصى تردد للساعة | 80 MHz |
| Performance | 100 DMIPS |
| Program Memory (Flash) | 128 KB |
| SRAM | 40 KB |
| Operating Voltage Range | 1.71 V to 3.6 V |
| تيار الإيقاف | 16 nA (4 wakeup pins) |
| VBAT Mode Current | 300 nA (RTC + 32x32-bit backup regs) |
| نطاق درجة حرارة التشغيل | -40C to +85C / +125C |
| العلبة | 48-UFQFPN (7x7 mm) |
| Number of I/O Pins | 38 GPIO |
| ADC | 1 x 12-bit, 5 Msps |
| DAC | 2 x 12-bit |
| Comparators | 2 |
| Operational Amplifiers | 2 |
| Communication Interfaces | USB FS, 2x I2C, 2x SPI, 3x USART, LPUART, CAN, I2S |
| Hardware Cryptography | AES-128, TRNG |
| Internal Voltage Regulator | SMPS step-down + LDO |
| نوع التركيب | Surface Mount |
| حالة RoHS | Compliant |
تكوين أطراف STM32L412CBU6
| دبوس 1 | VDD — Main power supply (1.71-3.6V) |
| دبوس 2 | PA0 — GPIO PA0 / ADC IN0 / TSC G1_IO1 |
| دبوس 3 | PA1 — GPIO PA1 / ADC IN1 / OPAMP1_VINP |
| دبوس 4 | PA2 — GPIO PA2 / USART2_TX / ADC IN2 |
| دبوس 5 | PA3 — GPIO PA3 / USART2_RX / ADC IN3 |
| دبوس 6 | PA4 — GPIO PA4 / SPI1_NSS / DAC1_OUT1 |
| دبوس 7 | PA5 — GPIO PA5 / SPI1_SCK / DAC1_OUT2 |
| دبوس 8 | PA6 — GPIO PA6 / SPI1_MISO / ADC IN6 |
| دبوس 9 | PA7 — GPIO PA7 / SPI1_MOSI / ADC IN7 |
| دبوس 10 | PB0 — GPIO PB0 / ADC IN8 / TSC G2_IO1 |
| دبوس 11 | PB1 — GPIO PB1 / ADC IN9 / TSC G2_IO2 |
| دبوس 12 | PB2 — GPIO PB2 / BOOT0 |
| دبوس 13 | VSS — Ground |
| دبوس 14 | VDD — Main power supply |
| دبوس 15 | PA8 — GPIO PA8 / RCC_MCO |
| دبوس 16 | PA9 — GPIO PA9 / USART1_TX / I2C1_SCL |
| دبوس 17 | PA10 — GPIO PA10 / USART1_RX / I2C1_SDA |
| دبوس 18 | PA11 — GPIO PA11 / USB_DM |
| دبوس 19 | PA12 — GPIO PA12 / USB_DP |
| دبوس 20 | PA13 — GPIO PA13 / SWDIO (debug) |
| دبوس 21 | PA14 — GPIO PA14 / SWCLK (debug) |
| دبوس 22 | PA15 — GPIO PA15 / SPI3_NSS |
| دبوس 23 | VSS — Ground |
| دبوس 24 | PB3 — GPIO PB3 / SPI3_SCK / TIM2_CH2 |
| دبوس 25 | PB4 — GPIO PB4 / SPI3_MISO / TIM3_CH1 |
| دبوس 26 | PB5 — GPIO PB5 / SPI3_MOSI / TIM3_CH2 |
| دبوس 27 | PB6 — GPIO PB6 / USART1_TX / I2C1_SCL |
| دبوس 28 | PB7 — GPIO PB7 / USART1_RX / I2C1_SDA |
| دبوس 29 | BOOT0 — Boot mode select |
| دبوس 30 | PB8 — GPIO PB8 / I2C1_SCL / TIM4_CH3 |
| دبوس 31 | PB9 — GPIO PB9 / I2C1_SDA / TIM4_CH4 |
| دبوس 32 | VSS — Ground |
| دبوس 33 | VDD — Main power supply |
| دبوس 34 | NRST — Reset (active low) |
| دبوس 35 | PA0 — Wakeup pin 0 / WKUP1 |
| دبوس 36 | VREF+ — ADC reference voltage |
| دبوس 37 | VREF- — ADC reference ground |
| دبوس 38 | PA1 — Wakeup pin 1 / WKUP2 |
| دبوس 39 | PA2 — Wakeup pin 2 / WKUP3 |
| دبوس 40 | PA3 — Wakeup pin 3 / WKUP4 |
| دبوس 41 | VBAT — RTC battery supply input |
| دبوس 42 | PC13 — GPIO PC13 / TAMPER-RTC |
| دبوس 43 | PC14 — GPIO PC14 / OSC32_IN |
| دبوس 44 | PC15 — GPIO PC15 / OSC32_OUT |
| دبوس 45 | VSS — Ground |
| دبوس 46 | OSC_IN — HSE oscillator input |
| دبوس 47 | OSC_OUT — HSE oscillator output |
| دبوس 48 | VDD — Main power supply |
التطبيقات النموذجية
STM32L412CBU6 مناسب لـ 6 التطبيقs: Wearable Health Monitors, Industrial IoT Sensor Nodes, Smart Meters and Battery-Powered Endpoints, USB-Connected Devices and HID Peripherals, Battery-Powered IoT Hubs, Capacitive Touch User Interfaces.
Wearable Health Monitors
The STM32L412CBU6's 16 nA Shutdown current and 300 nA VBAT retention make it ideal for continuous-wear health sensors such as heart-rate straps, SpO2 patches, and activity trackers per ST datasheet (DS13083). Its Cortex-M4 with FPU runs sensor-fusion DSP at low active current; the on-chip 12-bit 5 Msps ADC captures multi-channel photoplethysmography (PPG) and bioimpedance data while the 40 KB SRAM holds raw sample buffers. Designers can drive the chip from a CR2032 coin cell for months, waking only on RTC interrupt to take a measurement, then returning to deep sleep. The AES-128 hardware accelerator secures BLE-paired data transfers without burdening the core.
موصى به
Industrial IoT Sensor Nodes
For wireless sensor nodes in Industry 4.0 deployments, the STM32L412CBU6's Cortex-M4 FPU executes edge analytics on vibration, temperature, and pressure data per ST datasheet (DS13083). The 80 MHz core with 100 DMIPS handles predictive-maintenance algorithms at the network edge; the 128 KB Flash accommodates LoRaWAN or Wireless M-Bus protocol stacks plus OTA firmware update logic. The 12-bit ADC at 5 Msps and two on-chip op-amps interface directly to bridge sensors and 4-20 mA loops without external signal conditioning. Crystal-less USB simplifies commissioning via direct tool connection in the field.
موصى به
Smart Meters and Battery-Powered Endpoints
Smart electricity, gas, and water meters benefit from the STM32L412CBU6's ultra-low standby and integrated crypto per ST datasheet (DS13083). The on-chip AES-128 hardware accelerator and TRNG secure DLMS/COSEM or wireless M-Bus communication links against tampering. 128 KB Flash holds metering firmware, calibration tables, and a billing stack; the 40 KB SRAM buffers instantaneous measurements during communication bursts. The USB Full-Speed interface with crystal-less operation enables field technicians to plug in a laptop and read out historical logs without driver installation, drawing power directly from the host VBUS.
موصى به
USB-Connected Devices and HID Peripherals
The STM32L412CBU6's USB 2.0 Full-Speed device with crystal-less operation makes it a strong fit for low-cost USB peripherals: gaming mice, programmable keypads, HID-class instruments, and USB-C accessories per ST datasheet (DS13083). Crystal-less USB eliminates the 12 MHz reference, reducing BOM and PCB area, while the Cortex-M4 with FPU processes HID reports with sub-millisecond latency. Designers can implement vendor-specific USB classes using the ST USB Device Library, with the on-chip 2x 12-bit DACs synthesizing analog signals on USB-controlled outputs (e.g., reference voltages or audio tones).
موصى به
Battery-Powered IoT Hubs
Edge AIoT hubs that aggregate multiple sensors can use the STM32L412CBU6 as a low-power host CPU per ST datasheet (DS13083). The Cortex-M4 FPU runs micro-machine-learning inference (e.g., TensorFlow Lite for Microcontrollers) on accelerometer or audio streams while drawing minimal current; the on-chip SMPS plus LDO regulator architecture automatically optimizes efficiency across the 1.71-3.6V supply range, drawing less from the battery during compute bursts. USB with crystal-less operation provides both power input and debug connectivity, ideal for solar- or battery-rechargeable hubs in remote installations.
موصى به
Capacitive Touch User Interfaces
The STM32L412CBU6 integrates the ST Touch Sensing Library support and TSC peripheral, making it suitable for capacitive touch control panels in appliance, automotive, and industrial interfaces per ST datasheet (DS13083). The 12-bit ADC plus on-chip op-amps enable robust touch detection with hardware noise filtering; 38 GPIO easily drive LED backlights and segment displays. Ultra-low Standby current extends battery life for portable touch panels, while the 80 MHz Cortex-M4 FPU handles debounce and gesture recognition in real time. The hardware AES-128 secures pin codes used for access or unlocking functions.
موصى به
ملخص المنتجات الموصى بها
بيانات مرجعية هندسية لـ STM32L412CBU6 — المقارنة وإرشادات التصميم ومعلومات الامتثال.
دليل الاختيار
المقارنة مع البدائل
| المعامل | هذا المنتج | STM32L432KBU6 | STM32L422CBT6 | STM32L433CCU6 | STM32L431CCU6 |
|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | UFQFPN-48 (7x7 mm) | UFQFPN-48 - same | UFQFPN-48 - same | UFQFPN-48 - same | UFQFPN-48 - same |
| Core | Cortex-M4 with FPU | Cortex-M4 with FPU | Cortex-M4 with FPU | Cortex-M4 with FPU | Cortex-M4 with FPU |
| Max Clock Frequency | 80 MHz | 80 MHz | 80 MHz | 80 MHz | 80 MHz |
| Flash Memory | 128 KB | 256 KB (+100%) | 128 KB (same) | 256 KB (+100%) | 256 KB (+100%) |
| SRAM | 40 KB | 64 KB (+60%) | 40 KB (same) | 64 KB (+60%) | 64 KB (+60%) |
| USB | Yes (FS, crystal-less) | Yes (FS, crystal-less) | Yes + USB-PD | Yes (FS, crystal-less) | Yes (FS, crystal-less) |
| AES Hardware Acceleration | AES-128 + TRNG | AES-128 + TRNG | AES-128 + TRNG | AES-128 + TRNG | AES-128 + TRNG |
| Unit Price (qty 1, USD) | $5.42 | $6.10 | $5.85 | $6.45 | $5.95 |
أبرز الفروقات
- Higher on-chip integration: AES-128 + TRNG + dual-opamp + dual DAC + 12-bit ADC in one MCU (مقابلSTM32F301K6T7)
- Crystal-less USB saves external 12 MHz crystal + capacitors (مقابلSTM32F051K8T6)
- Industry-leading 16 nA Shutdown mode current consumption (مقابلSTM32L452CEU6)
ملاحظات التصميم
Estimated: at 80 MHz active load the STM32L412CBU6 draws roughly 8 mA from a 3.3V supply. The UFQFPN-48 thermal pad has theta_JA of about 38 C/W on a 4-layer 1 oz PCB; the exposed pad MUST be soldered to a copper pour of at least 100 mm^2 with thermal vias (per datasheet DS13083). For solar-powered designs that operate intermittently, the duty cycle keeps the junction well below 85C, but continuous USB-host operation can exceed 70C without adequate copper.
Decouple each VDD/VDDA pin with 100 nF X7R ceramic + 1 uF bulk capacitance placed within 5 mm of the pin per ST datasheet (DS13083) layout guidelines. Place the VBAT decoupling cap as close to pin 41 as possible to maintain RTC accuracy. The OSC_IN/OSC_OUT traces must be guarded from digital signals to minimize clock jitter; even when crystal-less USB is used, the HSE traces should be kept short and surrounded by ground pour to reduce EMI.
Do not exceed 3.6V on any GPIO; even transients from inductive loads can latch the part. When using the internal SMPS, route the L1 inductor and C_OUT caps exactly as in the ST reference design DM00453095 to maintain efficiency. Boot0 pin must be pulled low via 10 kohm for normal boot; leaving it floating may cause intermittent boot from system memory. When migrating from STM32L1 series, validate Flash wait states - L4 runs at 80 MHz which requires specific wait-state configuration in the FLASH ACR register.
Crystal-less USB works only when the HSE bypass mode is selected in RCC with proper calibration; verify USB enumeration in production per USB 2.0 FS electrical compliance. Place USB_DM/USB_DP matched-length (within 2 mm) and route over a continuous ground plane. Add 90-ohm differential ESD protection (such as USBLC6-2SC6) as close to the connector as possible. For ADC readings below 10 kHz sample rate, disable SCAN mode for better noise rejection.
معلومات الامتثال
RoHS compliant per ST product page. Industrial temperature grade (-40C to +85C); for AEC-Q100 automotive qualification, consider STM32L4 series automotive variants listed in ST's AN4555 application note.
