Metering-grade 16-bit MCU with integrated 24-bit sigma-delta ADCs
Peripheral set includes a hardware multiplier, DMA, LCD driver, brown-out reset, POR, PWM timer, and watchdog timer. Connectivity covers I²C, SPI, UART/USART, IrDA, and LINbus — enough for a Modbus RTU or M-Bus gateway on the same die. The 52 GPIOs in the 80-LQFP package give headroom for a segmented LCD and a handful of pushbuttons or relay drivers. Operating from 1.8 V to 3.6 V and rated across -40°C to 85°C, it fits outdoor meter cabinets, industrial controllers, and battery-powered data loggers. The internal oscillator keeps the BOM lean for applications that can tolerate a few percent frequency drift over temperature.
What the 24-bit ADC path means for the analog front-end
Three independent 24-bit sigma-delta ADCs with programmable gain allow direct connection of current transformers and voltage dividers in a three-phase energy meter. The 10-bit auxiliary ADC handles temperature compensation or tamper detection without stealing conversion slots from the metrology pipeline. Clean clock, clean codes — the 25 MHz CPU clock is also the modulator clock source, so a stable crystal or calibrated DCO is essential to preserve the 24-bit noise floor.
Package and integration notes
80-LQFP (12x12 mm). Surface-mount only. The LCD segment driver shares pins with GPIO — review the pin mux before committing the PCB layout if you need the full 52 I/O count.