32 MHz Cortex-M0+ with 64 KB Flash — what it fits
The STM32L052C8T7: 48-LQFP package, 37 I/Os, USB, I²C, SPI, UART, I²S, DMA, PWM, 12-bit ADC (10 channels), 12-bit DAC.
Internal oscillator eliminates one external crystal for many applications.
Memory and peripheral set for sensor and control nodes
64 KB Flash is enough for moderate firmware stacks — bootloader, USB stack, sensor fusion, or Modbus RTU — and the 2 KB EEPROM saves configuration data without wearing the Flash. The 8 KB SRAM is tight for heavy buffering but adequate for typical control loops and register-based peripherals. The 10-channel 12-bit ADC and single 12-bit DAC handle analog front-end tasks, while USB, SPI, and UART/USART provide connectivity for sensor hubs, data loggers, and human-machine interfaces.
ST lists the STM32L052C8T7 as Active (current production). The base product number STM32L052 covers a range of Flash and RAM options in the same 48-LQFP footprint, giving some density headroom if firmware grows.