Item specifics
Description
The STM32F405RGT7 is a Cortex-M4 high-performance MCU from STMicroelectronics in an LQFP-64 package, offering the extended temperature range version of the STM32F405RGT6. It runs at 168 MHz with FPU and ART Accelerator. It integrates 1 MB Flash, 192 KB SRAM, USB 2.0 OTG (FS/HS), SDIO, camera interface (DCMI), hardware crypto/HASH processor, two 12-bit DACs, three 12-bit ADCs (16ch, up to 6 MSPS in triple-interleaved mode), up to 17 timers (incl. 2 advanced motor control PWM/deadtime). 51 I/Os, all 5 V-tolerant. Supply 1.8–3.6 V, operating temperature -40 °C to 105 °C. Core specifications are identical to the STM32F405RGT6 (-40 to 85 °C), with only the temperature range extended to 105 °C, optimized for high-temperature industrial and automotive applications. Compared to the STM32F401RET6 (84 MHz Cortex-M4), it doubles the core frequency, significantly increases SRAM and Flash, and adds advanced peripherals such as DCMI and a crypto engine.
Core: Arm Cortex-M4 168 MHz + FPU + ART Accelerator Memory: 1 MB Flash, 192 KB SRAM USB 2.0 OTG: FS + HS, FS on-chip PHY, HS requires external ULPI SDIO + HW Crypto: SD/MMC interface; AES 128/192/256, 3DES, HASH (MD5, SHA-1), RNG Camera Interface: 8–14-bit parallel DCMI 3×12-bit ADCs: 16 channels, 2.4 MSPS (up to 7.2 MSPS in triple-interleaved mode) 2×12-bit DACs: Buffered output Timers: Up to 17 (2× motor control PWM/deadtime/emergency stop, 12× 16-bit GP/quadrature encoder, 2× basic, 2× watchdogs, SysTick) Communication Interfaces: 4×USART + 2×UART (ISO7816/LIN/IrDA), 3×SPI (30 Mbit/s), 2×I2S, 3×I2C (SMBus), USB OTG, SDIO I/Os: 51, all 5 V-tolerant Low Power: Sleep/Stop/Standby, VBAT backup RTC Temperature Range: -40 °C to 105 °C Package: LQFP-64 (10×10×1.4 mm)
Industrial: PLCs, inverters, precision motor drives (high-temperature environments) Motor Control: Dual-motor FOC, servo drives, pumps Automotive: Vehicle lighting control, sensor nodes, automotive gateways Image Capture: Simple camera monitoring, barcode scanning, industrial vision Consumer: Drone flight controllers, game controllers, high-end remote controls Security Applications: IoT security, payment terminals
-40 °C to 105 °C Wide Temperature: Meets high-temperature industrial and automotive requirements on top of the F405 series' high performance 168 MHz Cortex-M4 + FPU: Strongest performance in this package class for complex DSP and floating-point operations 192 KB SRAM + 1 MB Flash: Ample memory for large firmware and complex algorithms DCMI Camera Interface: Supports CMOS sensors for image capture and vision applications Hardware Crypto Engine: AES/3DES/HASH/RNG for data security Dual DACs + 3 ADCs: Comprehensive analog functions with multi-channel synchronous acquisition 17 Timers (incl. 2 Motor Control): Supports dual-motor FOC Mature STM32 Ecosystem: CubeIDE/CubeMX/HAL/LL
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FAQ:
What is the STM32F405RGT7 and what does the “7” suffix mean?
The STM32F405RGT7 is a 168 MHz Arm Cortex‑M4F microcontroller with 1 MB Flash and 192 KB SRAM, housed in an LQFP‑64 package. The “7” indicates an industrial extended temperature range of -40 °C to +105 °C, making it suitable for harsh environments such as outdoor equipment, automotive subsystems, and furnace controllers. It lacks Ethernet and a DCMI camera interface, but retains USB OTG HS/FS, dual CAN, and an FSMC external memory controller.
How does the STM32F405RGT7 differ from the STM32F405VGT6? When should I pick the RGT7?
Both share the same core, 1 MB Flash, 192 KB SRAM, and peripheral set (no Ethernet, no camera). The key differences are the package and temperature range. The VGT6 uses an LQFP‑100 with up to 82 I/Os and is rated for -40 °C to +85 °C. The RGT7 uses an LQFP‑64 with up to 51 I/Os and extends the high temperature to +105 °C. Choose the RGT7 when board space is extremely limited, the I/O count can be kept within 51 pins, and your product must withstand high ambient temperatures. The VGT6 is better if you need more I/Os and standard industrial temperatures are sufficient.
Is 1 MB Flash and 192 KB SRAM enough for a complex real‑time control application on a 64‑pin device?
Absolutely. 1 MB of Flash can comfortably hold a real‑time OS, motor‑control libraries (FOC, digital PFC), a USB device stack, and a substantial application. The 192 KB SRAM is sufficient for control loops, communication buffers, and moderate data logging. Many production‑proven motor drives, USB instruments, and compact industrial controllers use this exact memory configuration, even in space‑constrained 64‑pin packages.
Can I connect external memory to the STM32F405RGT7? Does the 64‑pin package limit this?
The chip includes an FSMC (Flexible Static Memory Controller) that supports NOR Flash, PSRAM, and NAND Flash, but **does not** support SDRAM. On the 64‑pin package, the FSMC data bus is limited to 8‑ or 16‑bits due to the reduced I/O count. You can still connect a fast 16‑bit PSRAM for additional data buffering, or use the SDIO interface to store data on an SD card. The internal 192 KB SRAM handles most real‑time needs without external memory.
Why doesn't the STM32F405RGT7 have Ethernet or a camera interface? How can I add connectivity?
The STM32F405 family intentionally omits the Ethernet MAC and DCMI camera to reduce cost for applications that do not need them. For networking, you can connect an external SPI‑to‑Ethernet controller (e.g., W5500) via one of the SPI ports. For a camera, you can use a module with a built‑in FIFO connected to the FSMC. If your design absolutely requires native Ethernet or a parallel camera, the STM32F407 (in a compatible package) would be a more suitable choice.
Is the STM32F405RGT7 suitable for motor control and digital power supplies?
Yes, it is an excellent fit. The Cortex‑M4F core features a single‑precision FPU and DSP instructions (single‑cycle MAC, SIMD). Two advanced‑control timers provide complementary PWM outputs with dead‑time insertion, and three 12‑bit ADCs can achieve up to 7.2 Msps in interleaved mode. All of this is available in the compact 64‑pin package, making it a popular choice for single‑axis motor drives and compact digital PFC converters, especially when high‑temperature operation is required.
Can I use the STM32F405RGT7 for USB high‑speed applications? Is an external PHY needed?
Yes. The chip provides a full‑speed USB OTG controller with an integrated PHY, and a separate high‑speed controller that works with an external ULPI PHY. You can implement USB HS devices or hosts, such as high‑speed data loggers or audio interfaces, even on the 64‑pin package, provided you carefully plan the pin allocation with STM32CubeMX.
What low‑power modes does the STM32F405RGT7 support, and what is the typical Stop‑mode current?
It supports Sleep, Stop, and Standby modes. In Stop mode with full 192 KB SRAM retention, the typical current is around 110 µA. The chip can wake up quickly on USB, CAN, or external interrupts. Its FPU and DSP let you finish processing faster and return to sleep sooner, which is beneficial for battery‑powered sensors and portable instruments that operate in high‑temperature environments.
How can I perform over‑the‑air (OTA) firmware updates with the STM32F405RGT7's 1 MB single‑bank Flash?
The 1 MB Flash can be logically partitioned into a bootloader, an active application, and a download buffer, or split into two 512 KB slots for an A/B update scheme. The 192 KB SRAM can temporarily hold the new firmware image during reception via USB, UART, or an external SPI‑to‑Wi‑Fi module. A CRC or signature check ensures a safe update without hardware dual‑bank Flash.
What are the most typical applications for the STM32F405RGT7, given its small package and wide temperature range?
It excels in space‑constrained, high‑temperature industrial applications such as compact motor drives, automotive sensors (non‑safety), outdoor IoT nodes, handheld instruments, USB‑connected data loggers, and any product that must operate reliably from -40 °C up to +105 °C without the overhead of Ethernet or a camera. The combination of 1 MB Flash, a powerful M4 core, and a tiny LQFP‑64 footprint makes it a versatile and rugged workhorse.