Product Parameters Model: STM32F103RET6 CPU: ARM 32-bit Cortex-M3, up to 72 MHz Board Size: 50 x 50 mm Debug Interface: JTAG/SWD Memory: 512 KB Flash, 64 KB RAM Oscillators: Factory-calibrated 8 MHz and 40 kHz RC oscillators; 32 kHz RTC oscillator with calibration Power Supply: 2.0–3.6 V Power Management: POR/PDR, programmable voltage detector (PVD), sleep/shutdown/standby modes, VBAT for RTC backup ADC: Two 12-bit ADCs, up to 21 channels, 0–3.6 V input range, triple sampling and hold, internal temperature sensor DMA: 7-channel controller supporting timers, ADC, SPI, I²C, and USART I/O Ports: 51 multifunctional bidirectional GPIO pins; most pins 5V-tolerant; configurable as external interrupts Timers: Three general-purpose timers, one advanced-control timer Communication Interfaces: - Up to two I²C interfaces (SMBus/PMBus compatible) - Up to three USART interfaces - Up to two SPI interfaces (up to 18 Mbit/s) - One CAN 2.0B interface - One USB 2.0 full-speed interface Color: Blue Material: PC + metal Note: Slight variations in appearance between batches do not affect functionality. Package Includes: 1 x Development Board Module (No other accessories included.) Note: Color may vary slightly due to lighting and screen settings. Dimensions are subject to a tolerance of ±1–3 cm.