Item specifics
Description
STM32F746BGT6 is a Cortex-M7 MCU at 216 MHz, LQFP-208. 1 MB Flash, 320 KB SRAM, LCD-TFT controller (up to XGA), Chrom-ART (DMA2D), Ethernet MAC, USB OTG HS/FS, DCMI, HW crypto (AES/3DES/HASH/RNG), FMC (SDRAM), Quad SPI, 2×SAI, SPDIF-Rx, dual CAN, 3×12-bit ADCs (24 ch), 2×12-bit DACs, 17 timers (2× advanced motor control). 168 x 5 V-tolerant I/Os. 1.7–3.6 V, -40–85 °C. Higher frequency and larger SRAM than F429, with enhanced graphics and data processing.
Core: Cortex-M7 216 MHz, FPU + L1 cache + ART Memory: 1 MB Flash, 320 KB SRAM Display: LCD-TFT (XGA), Chrom-ART (DMA2D) Memory I/F: FMC (SDRAM/NOR/NAND) Connectivity: Ethernet MAC, USB OTG HS/FS, DCMI, Dual CAN 2.0B, SDIO, Quad SPI, 2×SAI, SPDIF-Rx, 4×USART+4×UART, 6×SPI/I2S, 3×I2C Security: AES/3DES/HASH (MD5/SHA-1), True RNG Analog: 3×12-bit ADCs (24 ch), 2×12-bit DACs Timers: 17 (2× motor control PWM/deadtime, 10× GP, 2× basic, 2× WDT) I/Os: 168 (5 V-tolerant) Package: LQFP-208
Advanced HMI, industrial control panels, IoT gateways, motor drives, audio processing, encryption terminals
216 MHz Cortex-M7 + 320 KB SRAM: High performance and large capacity LCD-TFT + Chrom-ART: Smooth graphical interfaces Ethernet + USB HS/FS + Crypto + Dual CAN: Comprehensive connectivity and security Quad SPI + SAI + SPDIF: Fast storage and multi-channel audio 168 I/Os: Ultra-high integration
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FAQ:
What is the STM32F746BGT6 and how does it fit into the STM32F7 family?
The STM32F746BGT6 is a 216 MHz Cortex‑M7 microcontroller with 1 MB of on‑chip Flash, 320 KB of SRAM, a hardware Chrom‑ART graphics accelerator, and a parallel TFT‑LCD controller. Packaged in an LQFP‑176 body, it is the largest non‑BGA member of the F746 line, targeting designs that need a rich graphical user interface and high‑speed connectivity without the manufacturing complexity of BGA packages.
How does the STM32F746BGT6 differ from the STM32F746NGH6? What trade‑offs are made for the LQFP‑176 package?
The BGT6 uses an LQFP‑176 package with exposed pins, making it far easier to hand‑solder and inspect than the TFBGA‑216 used by the NGH6. The main functional difference is that the BGT6 does not include the MIPI DSI host controller—it drives displays exclusively via the parallel RGB interface. For the vast majority of industrial and medical panels that still use parallel RGB, this is not a limitation, and the LQFP package often simplifies PCB layout and production.
Can the LQFP‑176 package be hand‑soldered, and is it suitable for small‑batch prototyping?
Yes. With a 0.5 mm pin pitch and exposed leads, LQFP‑176 can be drag‑soldered with a fine‑tip iron and flux. It is far more accessible than any BGA package and allows visual inspection of every joint. This makes it a popular choice for lab prototypes, low‑volume production, and designs that may require rework during development.
How much Flash and SRAM does the STM32F746BGT6 provide, and can it handle a full TouchGFX GUI without external memory for code?
It provides 1 MB of Flash and 320 KB of SRAM (256 KB general‑purpose + 64 KB DTCM). The 1‑MB Flash easily holds a complete RTOS, TCP/IP stack, TouchGFX framework, and a rich set of graphical assets. External SDRAM is typically added for the frame buffer, but all application code and static assets can live inside the on‑chip Flash, resulting in a clean two‑chip memory architecture (MCU + SDRAM) that reduces BOM cost and board space.
Does the STM32F746BGT6 support MIPI DSI? If not, what display interfaces are available?
No, the BGT6 does not have a MIPI DSI interface. It offers a parallel RGB TFT‑LCD controller that supports resolutions up to XGA (1024×768) with 24‑bit color. This interface is still the standard for most industrial, medical, and home‑automation displays, and it works seamlessly with the Chrom‑ART accelerator for smooth animations and low CPU load.
How does the Chrom‑ART accelerator improve graphics performance on a parallel RGB display?
Chrom‑ART (DMA2D) handles pixel‑format conversion, alpha blending, and block copying entirely in hardware. It can composite multiple layers and update the frame buffer without involving the CPU, allowing fluid GUI transitions even at 1024×768 resolution. This hardware offload is especially valuable in parallel‑RGB systems where the CPU would otherwise be busy with pixel manipulation.
How does the STM32F746BGT6 compare with the STM32F767BIT6? When should I choose one over the other?
Both use an LQFP‑176 package and share the same Chrom‑ART and parallel RGB controller. The F767BIT6 offers 2 MB of Flash and a double‑precision FPU, while the F746BGT6 provides 1 MB of Flash and a single‑precision FPU. If your firmware and assets fit in 1 MB and you do not need double‑precision math, the F746 often delivers the same graphics experience with a simpler memory map. Choose F767 when you need the extra code space or higher numerical precision for control loops.
Can I upgrade from an STM32F429/439 to the STM32F746BGT6? What benefits will I see?
Absolutely. The F746 raises the CPU clock from 180 MHz to 216 MHz, adds the Chrom‑ART accelerator for much smoother graphics, and increases the general‑purpose SRAM to 256 KB. The LQFP‑176 package is often pin‑compatible with high‑end F429 designs, enabling a straightforward hardware migration. Existing HAL code can be reused with minimal changes, giving a significant performance and GUI quality boost without a complete redesign.
Is over‑the‑air (OTA) firmware update possible on the STM32F746BGT6 with its single‑bank Flash?
Yes. The 1‑MB Flash can be partitioned into two 512‑KB application images for a safe A/B update scheme, or into a bootloader, application, and download buffer. The 256‑KB general‑purpose SRAM can hold the new firmware image received via Ethernet or USB until it is verified and programmed. This approach ensures a reliable rollback mechanism even without hardware dual‑bank Flash.
What are the best applications for the STM32F746BGT6 given its LQFP package and 1‑MB Flash?
It excels in industrial HMI panels, building automation controllers, medical device interfaces, and smart home control screens. The LQFP‑176 package allows easy manufacturing and rework, while the 1‑MB Flash and Chrom‑ART accelerator deliver rich, responsive graphical interfaces on parallel RGB displays without the complexity of BGA designs.