The STM32F103ZET7: The 112 I/O lines in a 144-LQFP package (20x20 mm) make it a dense pin-count option for systems that need parallel sensor interfaces or multiple UART/SPI peripherals.
The peripheral list includes DMA, motor-control PWM, a temp sensor, and a full set of connectivity: CAN, I2C, SPI, UART/USART, USB, IrDA, and LIN. Data converters cover 21 analog inputs at 12-bit resolution and two 12-bit DAC outputs — enough for multi-channel sensor acquisition without an external ADC.
Supply rails and power-up sequence
The built-in POR/PDR/PVD circuits handle power-up sequencing without an external supervisor — the MCU holds reset until the supply is stable. Internal oscillator is available, though for CAN or USB operation an external crystal is recommended for tighter timing.