The **STM32F373C8** is a high-performance microcontroller from STMicroelectronics based on the ARM® Cortex®-M4 32-bit RISC core. It is specifically designed for applications requiring high-precision analog sensing and signal processing. --- ### 1. Core Specifications The device operates at a frequency of up to 72 MHz and features a Floating Point Unit (FPU) for complex mathematical calculations. | Feature | Specification | | :--- | :--- | | **Core** | ARM® Cortex®-M4 with FPU | | **Max CPU Frequency** | 72 MHz | | **Flash Memory** | 64 Kbytes | | **SRAM** | 16 Kbytes | | **Operating Voltage** | 2.0V to 3.6V | | **Package** | LQFP48 (7x7 mm) | --- ### 2. Key Electronic Peripherals The "F373" series is unique because of its advanced analog integration, making it ideal for metering and sensor interfaces. #### A. Analog-to-Digital Converters (ADC) * **SAR ADC:** One 12-bit ADC (up to 1 MSPS) with 9 channels. * **Sigma-Delta ADC:** Three 16-bit Sigma-Delta ADCs. These are the "star" feature, allowing for extremely high-precision measurements of slow-moving signals (like weigh scales or temperature sensors). #### B. Digital-to-Analog Converters (DAC) * Three 12-bit DAC channels with two buffered outputs. #### C. Timers and PWM * One 32-bit timer and seven 16-bit timers. * Supports PWM outputs for motor control or LED dimming. #### D. Communication Interfaces * **I2C:** 2x interfaces (supporting SMBus/PMBus). * **USART:** 3x interfaces (supporting ISO7816, LIN, IrDA). * **SPI:** 3x interfaces. * **CAN:** 1x CAN interface (2.0B Active). * **USB:** 2.0 full-speed interface. --- ### 3. Pinout and Connectivity Example The STM32F373C8 uses the **LQFP48** footprint. Below is a simplified representation of functional pin groupings: ```c // Example: Basic GPIO Initialization in C (HAL) void GPIO_Init(void) { __HAL_RCC_GPIOA_CLK_ENABLE(); // Enable Clock for Port A GPIO_InitTypeDef GPIO_InitStruct = {0}; GPIO_InitStruct.Pin = GPIO_PIN_5; GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP; GPIO_InitStruct.Pull = GPIO_NOPULL; GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW; HAL_GPIO_Init(GPIOA, &GPIO_InitStruct); } ``` --- ### 4. Power Management The chip includes several low-power modes to extend battery life: 1. **Sleep mode:** CPU stopped, peripherals keep running. 2. **Stop mode:** All clocks stopped, SRAM and register contents retained (fastest wake-up). 3. **Standby mode:** Power-down of the entire digital domain; only RTC and backup registers remain powered.