STM32L431RCI6 - 80MHz Cortex-M4 MCU | STMicroelectronics
料号： STM32L431RCI6 ✓ 量产中STM32L431RCI6 概述
An ultra-low-power microcontroller is designed to balance responsive processing with low energy consumption during both active operation and sleep. The STM32L4 family belongs to the hierarchy microcontroller, embedded processor, 32-bit RISC processor, and power-conscious embedded controller. This makes the STM32L431RCI6 suitable for connected industrial equipment, compact sensors, portable instruments, and battery-operated products that periodically sleep between tasks.
Principal features include an 80 MHz Arm Cortex-M4F processor, 256 KB of Flash, 64 KB of SRAM, a single-precision FPU, full DSP instruction support, and an RTC with hardware calendar, alarms, and calibration. The compact 64-UFBGA package has a 5 x 5 mm body size, allowing a high component density on space-constrained boards while retaining a large set of mixed-signal and communication interfaces.
The Cortex-M4F architecture supports efficient single-precision floating-point calculations and DSP operations commonly needed in sensor conditioning, digital filtering, and control algorithms. Its Harvard-style instruction flow and integrated debug support simplify firmware development, while the STM32L4 family's low-power operating modes can help reduce average system energy use in duty-cycled designs.
Typical applications include connected industrial sensors, compact environmental monitors, low-power data loggers, portable measurement equipment, and embedded control modules. The device is also suitable for designs that process locally acquired sensor data, maintain time and calendar information, and communicate through serial peripherals such as UART, SPI, or I2C.
PCB design should follow the manufacturer's land pattern and provide appropriate high-frequency decoupling near the supply pins. Because the 64-UFBGA footprint is compact, assembly inspection and solder-joint reliability require careful process control. Firmware should also validate low-power transitions, RTC behavior, and peripheral clock configuration during bring-up.
This product page combines the manufacturer's core device characteristics, procurement structure, and practical design considerations into an engineering-focused reference. It also highlights the limits of drop-in sourcing: no distinct pin-compatible alternatives are presented unless their package, pinout, memory configuration, and electrical requirements can be verified rather than inferred from a family name.
直接替换替代料： STM32L431RCI6 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
该产品暂无直接替换替代料。
请求替代料STM32L431RCI6 最大额定值与电气特性
| Product Type | Ultra-low-power 32-bit microcontroller |
| CPU Core | Arm Cortex-M4 with single-precision FPU |
| Architecture | 32-bit RISC |
| Maximum CPU Frequency | 80 MHz |
| Flash Memory | 256 KB |
| SRAM | 64 KB |
| DSP Instruction Support | Yes |
| RTC Features | Hardware calendar, alarms, and calibration |
| 封装 | 64-UFBGA (5 x 5 mm) |
| 安装类型 | Surface mount |
STM32L431RCI6 64-ufbga (5 x 5 mm) 引脚配置指南
STM32L431RCI6（64-ufbga (5 x 5 mm) 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： STM32L431RCI6.
请参阅 数据手册 以查看完整引脚配置。
典型应用
STM32L431RCI6 适用于 6 应用s: Industrial Environmental Sensors, Portable Measurement Instruments, Battery-Operated Data Loggers, Connected IoT Control Nodes, Low-Power Motor and Control Modules, Secure Access and Asset Tracking.
Industrial Environmental Sensors
The STM32L431RCI6 fits compact environmental sensing nodes because its 80 MHz Cortex-M4F core can process sampled data locally while the 256 KB Flash and 64 KB SRAM provide room for calibration tables, filtering, and protocol state. The single-precision FPU and DSP instructions improve arithmetic-heavy filtering and signal-conditioning workloads. Its 64-UFBGA 5 x 5 mm package helps minimize board area, while the RTC with hardware calendar, alarms, and calibration supports scheduled sampling and timestamped records. Duty-cycled operation can further reduce energy use in battery-operated field sensors.
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Portable Measurement Instruments
The STM32L431RCI6 is appropriate for portable measurement instruments that combine sensor acquisition, local computation, and a compact user interface or communications link. Its Cortex-M4F processor operates up to 80 MHz, while the FPU and DSP instructions accelerate filtering, calibration, and transform-related calculations. The 256 KB Flash supports embedded firmware and lookup data, and 64 KB SRAM accommodates working buffers. The RTC enables time-stamped measurements, and the 5 x 5 mm 64-UFBGA package supports dense handheld assemblies without requiring a larger leaded package.
推荐
Battery-Operated Data Loggers
The STM32L431RCI6 supports battery-operated data loggers that periodically wake to acquire, process, and store sensor readings. The ultra-low-power STM32L4 architecture is useful when average energy consumption, rather than peak processing speed alone, determines battery life. Its 256 KB Flash and 64 KB SRAM can hold acquisition code and working buffers, while the RTC with alarms can trigger periodic wake events. The compact 64-UFBGA footprint also reduces board space, although the final battery calculation must include radio, sensor, regulator, and sleeping-state currents.
推荐
Connected IoT Control Nodes
The STM32L431RCI6 is well suited to compact IoT control nodes that combine local logic with a serial communications module. At 80 MHz, the Cortex-M4F core can handle protocol processing, state management, and actuator control, while the FPU and DSP instructions assist with local data conditioning. The 256 KB Flash and 64 KB SRAM provide a practical firmware and data budget for many edge nodes. The 64-UFBGA package supports dense assemblies, and the RTC permits scheduled communication or logging. Final interface selection requires checking the exact peripheral mix and pin multiplexing in the manufacturer datasheet.
推荐
Low-Power Motor and Control Modules
The STM32L431RCI6 can serve as the supervisory controller in compact motor-control and actuator modules where real-time computation and low standby consumption are both important. Its 80 MHz Cortex-M4F core supports control-loop computation, and the single-precision FPU assists with proportional, integral, derivative, filtering, and transform calculations. The RTC can coordinate scheduled motion or maintenance events, while the 5 x 5 mm 64-UFBGA package saves board space. External power-stage components, protection networks, timing margins, and thermal limits remain the responsibility of the complete motor-drive design.
推荐
Secure Access and Asset Tracking
The STM32L431RCI6 fits compact access-control or asset-tracking modules that require event processing, local storage, and precise timekeeping. Its 256 KB Flash accommodates application firmware, configuration data, and update images, while 64 KB SRAM supports protocol buffers and state tracking. The RTC with hardware calendar, alarms, and calibration is valuable for timestamping access events and enforcing time-based schedules. The Cortex-M4F core provides enough performance for local filtering and control, and the 64-UFBGA package supports miniaturization. Security requirements and the target temperature range must be evaluated for each deployment.
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推荐产品汇总
工程参考数据： STM32L431RCI6 ——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 |
|---|---|
| CPU Core | Arm Cortex-M4F with single-precision FPU |
| Maximum CPU Frequency | 80 MHz |
| Flash Memory | 256 KB |
| SRAM | 64 KB |
| DSP Instruction Support | Yes |
| RTC Capability | Hardware calendar, alarms, and calibration |
| Package | 64-UFBGA (5 x 5 mm) |
| Brand | STMicroelectronics |
关键差异点
- Compact high-performance package integration （对比 STM32L431RCT6)
- Integrated DSP and floating-point processing （对比 STM32F103RCT6TR)
- Low-power system integration （对比 STM32F103RCT6TR)
设计说明
Follow the exact 64-UFBGA land pattern and solder-mask recommendations in the manufacturer package drawing. Place decoupling capacitors close to the intended supply and ground balls, provide a clean return path beneath the device, and route sensitive analog inputs away from switching nodes. Because the package is only 5 x 5 mm, use assembly-process capability, solder-paste inspection, and X-ray or cross-section inspection appropriate to the volume and defect risk.
Build the power budget from the selected STM32L431xx operating mode and the complete board load. Include the Cortex-M4F core, active peripherals, analog blocks, external regulator losses, sensors, and communications in both active and sleep states. For a duty-cycled device, calculate weighted average current from each mode's duration and duty ratio. Select the external regulator and bulk capacitance for the required voltage range and transient response shown in the manufacturer datasheet.
Do not assume that two devices from the same STM32L431 family are drop-in equivalents. Verify the package type, pin count, ball or lead assignments, temperature grade, memory density, supply range, and peripheral mix before substituting an order code. In particular, a UFBGA variant and an LQFP variant require different layouts even when their core and memory specifications are similar. Treat packaging suffixes primarily as orderable-format identifiers rather than separate functional alternatives.
Assign oscillator, debug, and high-speed serial signals before finalizing the ball map because their alternate functions can restrict usable GPIO positions. Keep clock routing short and return through a nearby ground reference, avoid routing sensitive analog inputs beneath digital activity, and reserve test points for SWD programming and production programming. Validate the final pin mux in firmware because one physical ball may support several peripheral functions depending on the active configuration.
合规信息
Exact-order-code compliance declarations were not established by the available manufacturer and distributor result snippets. Obtain current RoHS, REACH, lead-free, halogen-free, and conflict-minerals documentation for STM32L431RCI6 through the Request a Quote form when required for procurement.
