The STM32L476QEI6TR is a 32-bit ARM Cortex-M4 MCU from STMicroelectronics' STM32L4 ultra-low-power series, clocked at 80 MHz with 512 KB of Flash program memory and 128 KB of RAM. It is designed for energy-conscious applications that still need signal-processing throughput — think battery-operated instrumentation, field sensors, and portable medical devices where every microamp matters but you cannot give up DSP or FPU acceleration.
The 80 MHz Cortex-M4 with FPU handles real-time sensor fusion or audio processing without offloading to a peripheral. The 512 KB Flash and 128 KB RAM support moderate firmware images and local data logging.
The 109 GPIOs in the 132-UFBGA package give enough pins to drive a small TFT display, read a keypad, and talk to a dozen sensors without a port expander. The integrated LCD controller drives segmented glass displays directly — a common requirement in handheld meters and panel indicators.
Supply range and power management
Multiple low-power modes — stop, standby, and shutdown — are standard for the STM32L4 family, with typical current consumption in the sub-µA range during retention. The internal oscillator saves an external crystal for applications that can tolerate the accuracy; for CAN or USB timing, an external crystal is still recommended.
The lifecycle status on this part is marked EOL hot, meaning ST has issued an end-of-life notice and the last-time-buy window is active. The base product number STM32L476 covers a wide density and package range.