STM32F405RGT6 — high-performance foundation line MCU
The STM32F405RGT6 is an STMicroelectronics 32-bit ARM Cortex-M4 microcontroller from the STM32F4 series, built as a high-performance foundation line device. Typical applications include motor drives, industrial control, consumer electronics, and communications infrastructure where the Cortex-M4 DSP extensions and FPU accelerate real-time signal processing.
The 168 MHz core clock is the headline rating that separates this part from the STM32F1 and STM32L1 value lines. With a single-cycle multiply and hardware divide, plus single-precision floating-point unit, the STM32F405RGT6 can run field-oriented control (FOC) on a pair of motors, execute audio codec filters, or handle a USB OTG host stack without a dedicated coprocessor. The 192 KB SRAM is sized for a real-time operating system with several active tasks and a moderate frame buffer; the 1 MB Flash can hold a full application including bootloader, communication stacks, and a small filesystem.
The STM32F405RGT6 integrates a rich peripheral set: brown-out detect/reset, DMA, I²S audio interface, LCD parallel interface, POR, PWM timers, and a watchdog. For motor control, the PWM timers can drive three-phase inverter stages directly, and the CAN interface handles fieldbus communication.
Housed in a 64-LQFP (10x10 mm) package, the STM32F405RGT6 is a surface-mount device with a 0.5 mm pitch. Decoupling should follow the STM32F4 reference design: one 100 nF ceramic per VDD pair plus a 4.7 µF bulk capacitor on each supply rail. The 51 I/O are 5 V tolerant on most pins, simplifying level translation when interfacing with 5 V logic or sensors.
The part is ROHS3 compliant. For new designs, the STM32F405 series remains a supported mainstream choice with ongoing production and normal distribution availability.