STM32L412CBU6 - 80MHz Cortex-M4 128KB Flash MCU | STMicroelectronics
MPN: STM32L412CBU6 ✓ Hoạt độngSTM32L412CBU6 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho STM32L412CBU6 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với STM32L412CBU6 (cùng hình factor và footprint) — khác nhau ở Package, SRAM, Maximum Clock Frequency, ADC, Communication Interfaces.
STM32L432KBU6
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
STM32L422CBT6
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
STM32L433CCU6
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
STM32L431CCU6
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
STM32L452CEU6
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
STM32L412CBU6 Tỷ lệ tối đa & tính chất điện
| Core Architecture | ARM Cortex-M4 with FPU (32-bit) |
| Tần số xung maksimum | 80 MHz |
| Performance | 100 DMIPS |
| Program Memory (Flash) | 128 KB |
| SRAM | 40 KB |
| Operating Voltage Range | 1.71 V to 3.6 V |
| Điện áp tắt | 16 nA (4 wakeup pins) |
| VBAT Mode Current | 300 nA (RTC + 32x32-bit backup regs) |
| Khoảng nhiệt độ hoạt động | -40C to +85C / +125C |
| Hộp | 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 |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân STM32L412CBU6
| Chân 1 | VDD — Main power supply (1.71-3.6V) |
| Chân 2 | PA0 — GPIO PA0 / ADC IN0 / TSC G1_IO1 |
| Chân 3 | PA1 — GPIO PA1 / ADC IN1 / OPAMP1_VINP |
| Chân 4 | PA2 — GPIO PA2 / USART2_TX / ADC IN2 |
| Chân 5 | PA3 — GPIO PA3 / USART2_RX / ADC IN3 |
| Chân 6 | PA4 — GPIO PA4 / SPI1_NSS / DAC1_OUT1 |
| Chân 7 | PA5 — GPIO PA5 / SPI1_SCK / DAC1_OUT2 |
| Chân 8 | PA6 — GPIO PA6 / SPI1_MISO / ADC IN6 |
| Chân 9 | PA7 — GPIO PA7 / SPI1_MOSI / ADC IN7 |
| Chân 10 | PB0 — GPIO PB0 / ADC IN8 / TSC G2_IO1 |
| Chân 11 | PB1 — GPIO PB1 / ADC IN9 / TSC G2_IO2 |
| Chân 12 | PB2 — GPIO PB2 / BOOT0 |
| Chân 13 | VSS — Ground |
| Chân 14 | VDD — Main power supply |
| Chân 15 | PA8 — GPIO PA8 / RCC_MCO |
| Chân 16 | PA9 — GPIO PA9 / USART1_TX / I2C1_SCL |
| Chân 17 | PA10 — GPIO PA10 / USART1_RX / I2C1_SDA |
| Chân 18 | PA11 — GPIO PA11 / USB_DM |
| Chân 19 | PA12 — GPIO PA12 / USB_DP |
| Chân 20 | PA13 — GPIO PA13 / SWDIO (debug) |
| Chân 21 | PA14 — GPIO PA14 / SWCLK (debug) |
| Chân 22 | PA15 — GPIO PA15 / SPI3_NSS |
| Chân 23 | VSS — Ground |
| Chân 24 | PB3 — GPIO PB3 / SPI3_SCK / TIM2_CH2 |
| Chân 25 | PB4 — GPIO PB4 / SPI3_MISO / TIM3_CH1 |
| Chân 26 | PB5 — GPIO PB5 / SPI3_MOSI / TIM3_CH2 |
| Chân 27 | PB6 — GPIO PB6 / USART1_TX / I2C1_SCL |
| Chân 28 | PB7 — GPIO PB7 / USART1_RX / I2C1_SDA |
| Chân 29 | BOOT0 — Boot mode select |
| Chân 30 | PB8 — GPIO PB8 / I2C1_SCL / TIM4_CH3 |
| Chân 31 | PB9 — GPIO PB9 / I2C1_SDA / TIM4_CH4 |
| Chân 32 | VSS — Ground |
| Chân 33 | VDD — Main power supply |
| Chân 34 | NRST — Reset (active low) |
| Chân 35 | PA0 — Wakeup pin 0 / WKUP1 |
| Chân 36 | VREF+ — ADC reference voltage |
| Chân 37 | VREF- — ADC reference ground |
| Chân 38 | PA1 — Wakeup pin 1 / WKUP2 |
| Chân 39 | PA2 — Wakeup pin 2 / WKUP3 |
| Chân 40 | PA3 — Wakeup pin 3 / WKUP4 |
| Chân 41 | VBAT — RTC battery supply input |
| Chân 42 | PC13 — GPIO PC13 / TAMPER-RTC |
| Chân 43 | PC14 — GPIO PC14 / OSC32_IN |
| Chân 44 | PC15 — GPIO PC15 / OSC32_OUT |
| Chân 45 | VSS — Ground |
| Chân 46 | OSC_IN — HSE oscillator input |
| Chân 47 | OSC_OUT — HSE oscillator output |
| Chân 48 | VDD — Main power supply |
Ứng dụng tiêu biểu
STM32L412CBU6 phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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).
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho STM32L412CBU6 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Higher on-chip integration: AES-128 + TRNG + dual-opamp + dual DAC + 12-bit ADC in one MCU (vsSTM32F301K6T7)
- Crystal-less USB saves external 12 MHz crystal + capacitors (vsSTM32F051K8T6)
- Industry-leading 16 nA Shutdown mode current consumption (vsSTM32L452CEU6)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
