STM32L412CBU6 - 80MHz Cortex-M4 128KB Flash MCU | STMicroelectronics
料号： STM32L412CBU6 ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.88 | $48.80 |
| 100 | $4.21 | $421.00 |
| 500 | $3.65 | $1,825.00 |
| 1,000 | $3.12 | $3,120.00 |
| 2,500 | $2.74 | $6,850.00 |
STM32L412CBU6 概述
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.
直接替换替代料： STM32L412CBU6 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： STM32L412CBU6 （相同外形与封装尺寸） ——差异在于 Package, SRAM, Maximum Clock Frequency, ADC, Communication Interfaces.
快速对比工具——选择替代料号进行并排对比：
STM32L432KBU6
✅ 直接替换📋 参考替代料（不在目录中）
STM32L422CBT6
✅ 直接替换📋 参考替代料（不在目录中）
STM32L433CCU6
✅ 直接替换📋 参考替代料（不在目录中）
STM32L431CCU6
✅ 直接替换📋 参考替代料（不在目录中）
STM32L452CEU6
✅ 直接替换📋 参考替代料（不在目录中）
STM32L412CBU6 最大额定值与电气特性
| Core Architecture | ARM Cortex-M4 with FPU (32-bit) |
| 最大时钟频率 | 80 MHz |
| Performance | 100 DMIPS |
| Program Memory (Flash) | 128 KB |
| SRAM | 40 KB |
| Operating Voltage Range | 1.71 V to 3.6 V |
| 关断电流 | 16 nA (4 wakeup pins) |
| VBAT Mode Current | 300 nA (RTC + 32x32-bit backup regs) |
| 工作温度范围 | -40C to +85C / +125C |
| 封装 | 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 |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
STM32L412CBU6 引脚配置
| 引脚 1 | VDD — Main power supply (1.71-3.6V) |
| 引脚 2 | PA0 — GPIO PA0 / ADC IN0 / TSC G1_IO1 |
| 引脚 3 | PA1 — GPIO PA1 / ADC IN1 / OPAMP1_VINP |
| 引脚 4 | PA2 — GPIO PA2 / USART2_TX / ADC IN2 |
| 引脚 5 | PA3 — GPIO PA3 / USART2_RX / ADC IN3 |
| 引脚 6 | PA4 — GPIO PA4 / SPI1_NSS / DAC1_OUT1 |
| 引脚 7 | PA5 — GPIO PA5 / SPI1_SCK / DAC1_OUT2 |
| 引脚 8 | PA6 — GPIO PA6 / SPI1_MISO / ADC IN6 |
| 引脚 9 | PA7 — GPIO PA7 / SPI1_MOSI / ADC IN7 |
| 引脚 10 | PB0 — GPIO PB0 / ADC IN8 / TSC G2_IO1 |
| 引脚 11 | PB1 — GPIO PB1 / ADC IN9 / TSC G2_IO2 |
| 引脚 12 | PB2 — GPIO PB2 / BOOT0 |
| 引脚 13 | VSS — Ground |
| 引脚 14 | VDD — Main power supply |
| 引脚 15 | PA8 — GPIO PA8 / RCC_MCO |
| 引脚 16 | PA9 — GPIO PA9 / USART1_TX / I2C1_SCL |
| 引脚 17 | PA10 — GPIO PA10 / USART1_RX / I2C1_SDA |
| 引脚 18 | PA11 — GPIO PA11 / USB_DM |
| 引脚 19 | PA12 — GPIO PA12 / USB_DP |
| 引脚 20 | PA13 — GPIO PA13 / SWDIO (debug) |
| 引脚 21 | PA14 — GPIO PA14 / SWCLK (debug) |
| 引脚 22 | PA15 — GPIO PA15 / SPI3_NSS |
| 引脚 23 | VSS — Ground |
| 引脚 24 | PB3 — GPIO PB3 / SPI3_SCK / TIM2_CH2 |
| 引脚 25 | PB4 — GPIO PB4 / SPI3_MISO / TIM3_CH1 |
| 引脚 26 | PB5 — GPIO PB5 / SPI3_MOSI / TIM3_CH2 |
| 引脚 27 | PB6 — GPIO PB6 / USART1_TX / I2C1_SCL |
| 引脚 28 | PB7 — GPIO PB7 / USART1_RX / I2C1_SDA |
| 引脚 29 | BOOT0 — Boot mode select |
| 引脚 30 | PB8 — GPIO PB8 / I2C1_SCL / TIM4_CH3 |
| 引脚 31 | PB9 — GPIO PB9 / I2C1_SDA / TIM4_CH4 |
| 引脚 32 | VSS — Ground |
| 引脚 33 | VDD — Main power supply |
| 引脚 34 | NRST — Reset (active low) |
| 引脚 35 | PA0 — Wakeup pin 0 / WKUP1 |
| 引脚 36 | VREF+ — ADC reference voltage |
| 引脚 37 | VREF- — ADC reference ground |
| 引脚 38 | PA1 — Wakeup pin 1 / WKUP2 |
| 引脚 39 | PA2 — Wakeup pin 2 / WKUP3 |
| 引脚 40 | PA3 — Wakeup pin 3 / WKUP4 |
| 引脚 41 | VBAT — RTC battery supply input |
| 引脚 42 | PC13 — GPIO PC13 / TAMPER-RTC |
| 引脚 43 | PC14 — GPIO PC14 / OSC32_IN |
| 引脚 44 | PC15 — GPIO PC15 / OSC32_OUT |
| 引脚 45 | VSS — Ground |
| 引脚 46 | OSC_IN — HSE oscillator input |
| 引脚 47 | OSC_OUT — HSE oscillator output |
| 引脚 48 | VDD — Main power supply |
典型应用
STM32L412CBU6 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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).
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： STM32L412CBU6 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Higher on-chip integration: AES-128 + TRNG + dual-opamp + dual DAC + 12-bit ADC in one MCU （对比 STM32F301K6T7)
- Crystal-less USB saves external 12 MHz crystal + capacitors （对比 STM32F051K8T6)
- Industry-leading 16 nA Shutdown mode current consumption （对比 STM32L452CEU6)
设计说明
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.
合规信息
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.
