120 MHz Cortex-M4 with 1 MB Flash — what it means for your firmware budget
The STM32L4Q5CGT6P runs an ARM Cortex-M4 core at 120 MHz, delivering roughly 150 DMIPS — enough for real-time sensor fusion, motor control loops, or protocol stacks without a co-processor. The 1 MB on-chip Flash and 320 KB SRAM leave room for a full RTOS, communication buffers, and application code; a typical FreeRTOS + TCP/IP stack footprint is under 100 KB, so you have headroom for field-upgradeable firmware. The 32-bit single-core architecture with DSP instructions and single-precision FPU handles fixed- and floating-point math natively — no software emulation penalty for PID coefficients or FFT bins.
Peripheral set and connectivity — what hooks into the bus
The LCD driver peripheral can drive a segment display directly, saving an external controller. The SAI peripheral supports I²S audio codecs if the application needs voice prompts or acoustic monitoring.
Package, temperature grade, and board integration
The surface-mount footprint fits standard two-layer PCB layouts; the exposed pad (if present on the LQFP-48 variant) aids thermal dissipation.
The part is ROHS3 compliant, exempt from the major restricted substances under EU Directive 2011/65/EU. No known PCN for this specific variant as of the last check.