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STM32F446RCT6

ARM Cortex-M4 180MHz, 256KB Flash, 128KB SRAM, FPU+DSP, USB HS, Dual QSPI, FMC, 3ADC+2DAC, LQFP-64

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Manufacturer Part：

STM32F446RCT6

Package：

LQFP-64 (10 x 10 x 1.4 mm, 0.5mm pitch)

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Product Categories：

Clock & Timing ICs, Integrated Circuits ICs

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Description

The STM32F446RCT6 from STMicroelectronics is a high-performance ARM Cortex-M4 microcontroller operating at up to 180 MHz with 256 KB Flash, 128 KB SRAM, and a single-precision FPU with DSP instructions. It features the ART Accelerator for zero-wait-state Flash execution, three 12-bit ADCs (2.4 MSPS), two 12-bit DACs, up to 20 communication interfaces (including USB 2.0 HS/FS OTG, 2× CAN, 4× SPI, 4× I²C, 6× USART/UART, 2× SAI), Dual QuadSPI, FMC with SDRAM support, and 17 timers. Housed in a 64-pin LQFP package (10×10 mm) with 50 GPIOs, it operates from 1.7 V to 3.6 V at -40°C to +85°C.

Product Introduction:STM32F446RCT6 Product Introduction

The STM32F446RCT6 is a high-performance microcontroller from STMicroelectronics’ STM32F4 series, based on the ARM Cortex-M4 32-bit RISC core with single-precision floating-point unit (FPU) and full DSP instruction set. It operates at frequencies up to 180 MHz, delivering 225 DMIPS and 608 CoreMark performance.

The key differentiator of the STM32F446 within the F4 family is its rich connectivity: it is the only F4 variant with Dual QuadSPI (supporting memory-mapped mode for cost-effective external Flash expansion), a Flexible Memory Controller (FMC) with SDRAM support, and two Serial Audio Interfaces (SAI) with dedicated audio PLLs. These features make it particularly attractive for consumer audio, industrial HMI, and IoT gateway applications.

The ART Accelerator (Adaptive Real-Time accelerator) uses a 128-bit wide Flash memory interface with instruction prefetch and cache to achieve zero-wait-state execution at 180 MHz from Flash, eliminating the performance penalty that typically affects Cortex-M4 devices running from non-cached Flash.

The RCT6 variant provides 256 KB Flash and 128 KB SRAM (plus 4 KB backup SRAM) in a 64-pin LQFP package with 50 GPIOs. This is the mid-density option; the RET6 variant offers 512 KB Flash in the same LQFP-64 package for applications requiring more code space.

Power consumption is 200 µA/MHz (typical) in Run mode from Flash at 180 MHz, with 50 µA in Stop mode. The device supports multiple low-power modes (Sleep, Stop, Standby) with VBAT supply for RTC and backup register retention.

The peripheral set includes three 12-bit ADCs (2.4 MSPS each, 7.2 MSPS in triple interleaved mode), two 12-bit DACs, two CAN 2.0B controllers, USB 2.0 full-speed and high-speed OTG with on-chip PHY, SPDIF-Rx input, camera interface, and HDMI-CEC.

Working Principle:STM32F446RCT6 Working Principle

**Cortex-M4 Core with FPU:** The 32-bit ARM Cortex-M4 core executes Thumb-2 instructions at 180 MHz. The single-precision FPU accelerates floating-point math (1-cycle MAC, hardware divide), critical for sensor fusion and audio DSP. The Memory Protection Unit (MPU) allows isolation of OS tasks for reliable embedded software.

**ART Accelerator:** The Adaptive Real-Time accelerator consists of an instruction cache, data cache, and prefetch queue between the Cortex-M4 and the embedded Flash. Since the Flash access time (25 ns) limits zero-wait execution to ~40 MHz without caching, the ART Accelerator caches both instruction and data accesses, achieving 180-MHz zero-wait performance for linear code paths. Cache misses add 1-3 wait states.

**Bus Matrix and DMA:** A 32-bit multi-AHB bus matrix connects the Cortex-M4, DMA controllers, and peripherals through separate AHB/APB buses. Two DMA controllers (16 streams total) with FIFOs and burst support offload data transfers (ADC-to-memory, memory-to-SPI, etc.) without CPU intervention. The FMC and QuadSPI each have dedicated AHB master ports for zero-contention external memory access.

**Clock and Power Management:** An internal 16-MHz RC (1% accuracy) enables startup without external crystal. An external 4-26 MHz crystal or resonator drives the main PLL to 180 MHz. Dynamic voltage scaling and clock gating per peripheral minimize power consumption. The VBAT domain maintains RTC and 4 KB backup SRAM when main power is removed.

Pin Description:STM32F446RCT6 Pin Definition and Functions

Pin Group	Name	Type	Description
Power	VDD, VDDA, VBAT	P	VDD=1.7-3.6V digital supply (4 pins); VDDA=analog supply; VBAT=battery backup for RTC/backup SRAM; VSS/VSSA=ground references (4+1 pins)
Boot	BOOT0	I	Boot mode selection; sampled at reset; 0=Flash, 1=System memory (bootloader); add 10kΩ pull-down for Flash boot
NRST	I	Active-low reset; open-drain with internal pull-up; Schmidt-trigger input; connect 100nF cap to GND and optional reset button
GPIO	PA0-PA15, PB0-PB15, PC0-PC15, PD0-PD2	I/O	50 GPIO pins; most 5V-tolerant; alternate function mapping for peripherals; up to 90 MHz toggle speed; 8 MHz external interrupt capability
OSC	PH0/OSC_IN, PH1/OSC_OUT	I/O	4-26 MHz external crystal oscillator; can be used as GPIO when using internal RC or external clock via MCO
Debug	PA13/SWDIO, PA14/SWCLK	I/O	Serial Wire Debug port; mandatory for programming and debugging; PA13=SWDIO, PA14=SWCLK; JTAG pins (PA15, PB3, PB4) shared with GPIO
USB	PA11/USB_DM, PA12/USB_DP	I/O	USB 2.0 full-speed data pins (on-chip PHY); connect directly to USB connector with 1.5kΩ pull-up on DP for FS device

Application Scenarios:In which products and applications isSTM32F446RCT6 used

Application	Description
IoT Gateway with External Memory	Use Dual QuadSPI for external NOR Flash (firmware + OTA storage) and FMC for SDRAM (network buffers); USB HS for host-mode peripheral connection; 180MHz + FPU for TLS encryption; 20+ interfaces for multi-protocol bridging (CAN, UART, SPI, I²C)
Audio Processing Device	SAI + dedicated audio PLL provide I²S/TDM audio interfaces; FPU accelerates FFT and filter algorithms; DAC generates analog audio output; SPDIF-Rx receives digital audio; USB HS streams audio data; 256KB Flash fits audio codec + application
Motor Control with Communication	Advanced TIM1/TIM8 PWM timers for 3-phase motor drive; 2× CAN for industrial network; ADC for current sensing; encoder interface on TIM2/5; DSP instructions for field-oriented control; FMC for HMI display buffer
Industrial HMI Controller	FMC drives parallel TFT LCD (8080/6800 mode); SDRAM stores frame buffer; Touch sensing via ADC; USB for configuration; CAN for PLC communication; LQFP-64 fits compact panel-mount enclosures

Alternative Models:What chips are recommended as replacements for STM32F446RCT6

Model	Manufacturer	Compatibility	Key Difference
STM32F446RET6	ST	Pin-Compatible Upgrade	Same LQFP-64 pinout; 512KB Flash (vs 256KB); same SRAM and peripherals; drop-in for code-heavy applications needing more Flash
STM32F407VGT6	ST	Functional Equivalent	LQFP-100 (larger); 1MB Flash, 192KB SRAM; Ethernet MAC (F446 lacks); no Dual QSPI or SAI; more GPIOs; use when Ethernet and more I/O needed
STM32G474VET6	ST	Competitive Alternative	LQFP-100; 170MHz Cortex-M4; 512KB Flash; high-resolution PWM for motor control; math accelerator (CORDIC); no USB HS; better analog peripherals; use for motor-focused designs
LPC4337JBD100	NXP	Competitive Alternative	LQFP-100; dual-core M4+M0; 204MHz M4; 1MB Flash; Ethernet; more I/O; higher cost; use when dual-core processing needed