32 MHz Cortex-M0+ — what the clock buys you
The STM32L071C8T6 runs an ARM Cortex-M0+ at 32 MHz. That is not a speed-demon number — it is deliberately paired with the STM32L0's ultra-low-power architecture so the core does not burn through the battery budget. For a sensor node, a simple control loop, or a field-transmitter that wakes, reads, logs, and sleeps, 32 MHz is enough to keep the active window short and the sleep current low. Memory on this part: 64 KB Flash for firmware, 20 KB SRAM for runtime data, and a separate 3 KB EEPROM block for calibration constants or configuration that survives resets without wearing the Flash. The EEPROM is a practical win — no need to manage a Flash-emulation routine for small persistent values.
Supply range and temperature — field-fit check
Supply runs from 1.65 V to 3.6 V. The operating temperature span is -40°C to 85°C.
I/O and peripherals — what connects
37 I/O lines come out of the 48-LQFP package. Connectivity includes I²C, SPI, UART/USART, and IrDA — enough for a Modbus RTU node, a sensor bus, or a serial display. There is also I²S for audio or precision timing peripherals. The 13-channel 12-bit ADC handles analog inputs without an external converter. Brown-out detect, POR, and a watchdog are built in, so external reset and supervision ICs can be left off the BOM.