The **STM32L412R8U6TR** is an ultra-low-power microcontroller developed by STMicroelectronics. It is based on the high-performance Arm® Cortex®-M4 32-bit RISC core operating at a frequency of up to 80 MHz. --- ### 1. Key Technical Specifications | Feature | Specification | | :--- | :--- | | **Core** | Arm® 32-bit Cortex®-M4 with FPU | | **Max Frequency** | 80 MHz | | **Flash Memory** | 64 KB | | **SRAM** | 40 KB | | **Operating Voltage** | 1.71 V to 3.6 V | | **Package** | VFQFPN64 (9x9 mm) | | **Operating Temp** | -40°C to +85°C (up to 125°C variants) | --- ### 2. Core Functional Blocks #### A. Power Management (Ultra-Low Power) This chip is designed for battery-operated devices. It features several power-saving technologies: * **FlexPowerControl:** Allows independent power supply for peripherals. * **Current Consumption:** * 300 nA in Shutdown mode. * 16 nA in Standby mode (with RTC). * 28 µA/MHz in Run mode. #### B. Memory Architecture * **Flash:** 64 KB of internal memory for code storage. * **SRAM:** 40 KB total (32 KB standard + 8 KB with parity check for safety-critical tasks). * **Quad SPI:** Interface for connecting external high-speed memories. #### C. Peripheral Connectivity The STM32L412R8U6TR includes a rich set of I/Os and communication interfaces: * **Analog:** 1x 12-bit ADC (up to 5 Msps), 1x Operational Amplifier, 2x Ultra-low-power comparators. * **Communication:** 3x UART/LPUART, 2x SPI, 2x I2C, 1x USB 2.0 (Crystal-less). * **Timers:** 1x 16-bit advanced control timer, 3x 16-bit general purpose, and 2x Low-power timers. --- ### 3. Naming Convention Breakdown The part number **STM32L412R8U6TR** provides specific hardware details: | Code | Meaning | | :--- | :--- | | **STM32** | Family: STMicroelectronics 32-bit MCU | | **L4** | Series: Ultra-low-power | | **12** | Line: Entry-level 80MHz core | | **R** | Pin Count: 64 pins | | **8** | Flash Size: 64 Kbytes | | **U** | Package: VFQFPN | | **6** | Temperature Range: -40°C to 85°C | | **TR** | Packing: Tape and Reel | --- ### 4. Typical Applications * **Wearables:** Smartwatches and fitness trackers due to low power draw. * **Industrial Sensors:** IoT nodes and remote monitoring systems. * **Medical:** Portable glucose meters or heart rate monitors. * **Smart Home:** Thermostats and security sensors.