STMicroelectronics STM32L412RBT6

Overview

STM32L412RBT6 from STMicroelectronics is an ultra-low-power Arm® Cortex®-M4 32-bit MCU with FPU, operating up to 80 MHz (100 DMIPS), featuring 128 KB flash, 40 KB SRAM, and integrated analog peripherals including dual 12-bit ADCs (5 Msps), one operational amplifier with PGA, and one ultra-low-power comparator. It supports external SMPS for optimized efficiency and targets battery-powered IoT sensors, portable medical devices, and energy-harvesting edge nodes.

For engineers reviewing the STM32L412RBT6 datasheet, STM32L412RBT6 pinout, STM32L412RBT6 application, or STM32L412RBT6 equivalent, key selection criteria include its 28 µA/MHz run-mode current at 3.3 V with SMPS, 4 µs wakeup from Stop mode, RTC with hardware calendar, and LQFP64 (10×10 mm) package compatibility with industrial temperature range (–40 °C to +85 °C).

Technical Context

The STM32L412RBT6 implements an Arm Cortex-M4 core with FPU and Adaptive Real-time Accelerator (ART™) enabling zero-wait-state execution from flash at 80 MHz. Its FlexPowerControl architecture delivers multiple low-power modes-including 32 nA Standby (4 wakeup pins), 245 nA Standby with RTC, and 0.7 µA Stop 2-managed via dedicated power control block and voltage regulator with LDO/SMPS support.

Analog subsystem includes two independent 12-bit ADCs (5 Msps, hardware oversampling up to 16-bit), one rail-to-rail op-amp with programmable gain amplifier (PGA), and one ultra-low-power comparator-all powered from a separate analog supply. Digital interfaces include USB 2.0 full-speed (crystal-less), 3× I²C FM+, 3× USART, 1× LPUART, 2× SPI, QuadSPI, and 10× timers (including 2× low-power 16-bit timers active in Stop mode).

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L412RBT6, the STM32L432KCU6 trades package size and USB flexibility for higher flash density in minimal footprint, while the STM32L552RET6 adds security and thermal robustness at significantly higher active power and cost-making the L412 optimal for cost-sensitive, battery-limited edge sensors needing balanced performance and ultra-low quiescent current.

Availability

STM32L412RBT6 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical diagnostics, smart utility meters, and wearable health monitors requiring stable component supply across long production lifecycles.

Supply support for STM32L412RBT6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32L4 series targets ultra-low-power embedded applications demanding high performance-per-milliwatt, with emphasis on battery longevity, rich analog integration, and flexible power management for IoT edge devices.

FAQ

Does STM32L412RBT6 support external SMPS, and what voltage rails does it require?

Yes, the STM32L412RBT6 supports external SMPS via dedicated VDD12 and VDDA12 pins. It operates with either internal LDO (VDD only) or external SMPS supplying 1.1 V to VDD12 and 1.2 V to VDDA12, enabling 28 µA/MHz run-mode current. The SMPS must meet tight ripple (<20 mVpp) and transient response specs per Section 6.3.6 of DS12469 Rev 9.

What is the maximum clock frequency achievable with the internal RC oscillators?

The internal multispeed oscillator (MSI) auto-trimmed by LSE achieves better than ±0.25% accuracy from 100 kHz to 48 MHz. At factory trim, the 16 MHz HSI RC is specified ±1%, and the 32 kHz LSI is ±5%. For full 80 MHz operation, an external crystal (4–48 MHz) or PLL driven by HSE/MSI is required-internal RC alone cannot reach 80 MHz.

How many capacitive sensing channels does the TSC support on this part?

The Touch Sensing Controller (TSC) on STM32L412RBT6 supports up to 12 capacitive sensing channels, compatible with touchkey, linear, and rotary touch sensor configurations. Channel mapping is fixed per pin assignment in Table 14 of DS12469 Rev 9, and all 12 channels operate independently with hardware-accelerated acquisition and filtering.

Is the QuadSPI interface capable of executing code directly from external flash (XIP)?

Yes, the QuadSPI peripheral supports Execute-in-Place (XIP) mode, allowing the Cortex-M4 core to fetch instructions directly from external QSPI flash without loading into internal SRAM. This feature requires proper memory-mapped configuration and is validated for Micron, Winbond, and Macronix QSPI devices per AN5059 and RM0394 documentation.