STM32G474CET6 ST Mainstream Arm Cortex-M4 Mixed-Signal 32-bit MCU 512KB Flash 128KB SRAM HRTIM Σ-Δ OpAmp DAC Comparator CAN FD USB LQFP-48

STM32G474CET6 Product Overview

STM32G474CET6 is a Cortex-M4 MCU at 170 MHz with FPU and math accelerator, LQFP-48. It features 512 KB Flash, 128 KB SRAM, a high-resolution timer (HRTIM, 12 channels, 184 ps resolution), USB 2.0 FS device (crystal-less), CAN FD, two 12-bit ADCs (5 Msps, 21 ch), two 12-bit DACs, four op-amps (PGA), three comparators, four Σ-Δ modulators (DFSDM), advanced motor control PWM, LP timers, RTC, 3×USART/UART, 2×SPI/I2S, 2×I2C. 38 x 5 V-tolerant I/Os. 1.7–3.6 V, -40–85 °C. Compared to the G473 series, adds the HRTIM for extremely precise PWM generation, making it ideal for demanding digital power, lighting, and advanced motor control applications.

STM32G474CET6 Core Features

Core: Cortex-M4 170 MHz, FPU + ART Accelerator + Math Accelerator (FMAC, CORDIC)

Memory: 512 KB Flash, 128 KB SRAM

High-Resolution PWM: 12-ch HRTIM with 184 ps resolution for complex topologies and precise switching

Analog: 4×PGAs, 2×12-bit ADCs (5 Msps, 21 ch), 2×12-bit DACs, 3×Comparators

Σ-Δ Modulators: 4×Σ-Δ modulators with DFSDM for high-precision sensor interfaces

Motor Control: 2×Advanced Timers (PWM/Deadtime/Brake), HRTIM, multiple GP/LP timers

Connectivity: USB 2.0 FS (Crystal-less), CAN FD, 3×USART/UART, 2×SPI/I2S, 2×I2C

I/Os: 38 (5 V-tolerant)

Package: LQFP-48

STM32G474CET6 Applications

Digital Power: Precision SMPS, full-bridge/half-bridge resonant converters, PFC, digital power management

Motor Control: FOC, high-precision servo control, BLDC/PMSM drives, stepper motors

Lighting Control: High-accuracy LED drivers, dimming control, smart lighting systems

Precision Sensing: High-accuracy Σ-Δ sensor measurement, industrial transmitters

Instrumentation: High-Precision Data Acquisition & Signal Conditioning

Consumer/Industrial: Drones, power tools, industrial automation, CAN FD nodes

STM32G474CET6 Key Advantages

High-Resolution Timer (HRTIM): 12 channels, 184 ps resolution — the ultimate solution for digital power and precision switching control

512 KB Flash + 128 KB SRAM: Massive storage for complex digital power algorithms and real-time control

4×Σ-Δ + 4×Op-Amps + 3×Comparators + ADC/DAC: Top-tier analog integration for precision measurement and closed-loop control

170 MHz Cortex-M4 + FPU + Math Accelerator: Blazing-fast DSP and control

USB 2.0 + CAN FD: High-speed USB and industrial CAN bus on one chip

38 I/Os in Compact 48-Pin: High-density connectivity for space-constrained high-performance power and control

1.7–3.6 V Wide Supply: Flexible for battery and various power sources

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FAQ

1. What is the STM32G474CET6, and where is it positioned in the STM32G4 series?
The STM32G474CET6 is a high‑performance mixed‑signal microcontroller from STMicroelectronics' STM32G4 series, built around an Arm® Cortex®‑M4 core with FPU and DSP extensions running at up to 170 MHz, in an LQFP‑48 package (7 mm × 7 mm). It is one of the most compact members of the G474 family, yet it fully retains 512 KB Flash, 128 KB SRAM, the high‑resolution timer (HRTIM), five rail‑to‑rail op‑amps, and seven ultra‑low‑power comparators. This delivers top‑tier analog signal conditioning and precise real‑time control in a very small PCB footprint, making it ideal for space‑constrained yet performance‑demanding applications such as digital power supplies, motor drives, and industrial sensors.

2. How can five op‑amps and seven comparators be retained in a 48‑pin package? Does this sacrifice I/O count?
The analog front‑end of the STM32G474CET6 is largely independent of the general‑purpose I/O pins. The op‑amps and comparators can be internally routed to the ADCs and timers, consuming few or no external pins. The actual number of available GPIOs is up to about 38, which is sufficient for most compact control boards. This illustrates the “high integration” design philosophy of the STM32G4 series: packing as many analog functions as possible into a small package, allowing developers to perform complex analog signal conditioning without external op‑amp or comparator chips in limited board space.

3. How does the STM32G474CET6 differ from the STM32G474RET6 (LQFP‑64), and how should I choose based on package and I/O needs?
Both share the identical processor core, 512 KB Flash, 128 KB SRAM, HRTIM, five op‑amps, seven comparators, and all communication interfaces (FDCAN, UART, SPI, I²C). The only differences are the package and available I/O count: the CET6 comes in an LQFP‑48 with up to about 38 I/Os, while the RET6 uses an LQFP‑64 with up to about 51 I/Os. If your system is highly PCB‑area‑sensitive and requires no more than 38 I/Os, the CET6 delivers the same performance and analog functionality in a smaller size. If you need more digital I/Os or more routing flexibility, the RET6 is the better choice.

4. Is the high‑resolution timer (HRTIM) limited in the 48‑pin package? Which power topologies can it support?
The HRTIM itself is not limited by the package; its internal channels and comparator links remain fully usable. While the pin count may restrict how many HRTIM outputs can be physically brought out, the main PWM channels required for popular topologies such as LLC, half‑bridge, full‑bridge, and phase‑shifted full‑bridge are typically still available. It continues to deliver PWM resolution down to 184 ps for precise voltage and current regulation in digital power and motor‑control applications.

5. Does the 512 KB Flash support dual‑bank and OTA updates? How can update safety be ensured?
Fully supported. It features a dual‑bank Flash architecture, allowing current firmware to execute from one bank while the other is erased and programmed. After a new firmware image is downloaded to the alternate bank and verified, a simple boot‑address switch completes the update. If a power loss or verification failure occurs, the system automatically rolls back to the original firmware, guaranteeing the device is never bricked. Combined with code readout protection (RDP) and the Memory Protection Unit (MPU), a secure remote firmware‑update scheme can be implemented—ideal for industrial equipment requiring highly reliable maintenance.

6. What high‑speed communication interfaces does the chip offer? Does it support CAN FD?
It integrates up to three FDCAN (Flexible Data‑Rate CAN) controllers, which are backward‑compatible with CAN 2.0 while supporting data rates up to 5 Mbps and payloads up to 64 bytes. Additionally, it provides multiple UARTs, SPIs, I²Cs, and I²S interfaces. All of these can operate simultaneously, making the chip ideal for industrial automation, vehicle networks, and distributed control systems. Within the 48‑pin package, careful pin‑multiplexing allows at least two CAN FD channels and UART/SPI to be brought out concurrently, meeting most field‑communication needs.

7. What can the USB‑C interface on the STM32G474CET6 do? Does it support Power Delivery?
The integrated USB‑C power‑delivery and communication controller supports USB 2.0 full‑speed device communication and can deliver up to 15 W (5 V/3 A) through simple CC‑pin detection. It does not implement the full USB Power Delivery (PD) protocol. If PD is required, an external PD controller can be added. For applications that do not need PD, the MCU can be powered and communicate directly over USB‑C, making it ideal for portable devices and USB‑powered small instruments.

8. What is its power consumption like? Is it suitable for industrial wide‑temperature environments?
The STM32G4 series is built on an advanced 90 nm process, with a run‑mode current as low as about 100 µA/MHz. It supports multiple low‑power modes—Sleep, Stop, and Standby—with Standby current dropping to the micro‑amp range. Combined with fast wake‑up times, it is well‑suited for battery‑powered portable industrial equipment and handheld instruments that require long battery life. The chip is typically rated for the industrial temperature range (-40 °C to 85 °C) and can operate reliably over the long term in harsh industrial environments.

9. What development tools are needed for the STM32G474CET6, and is it compatible with previous STM32 ecosystems?
It is fully compatible with the STM32Cube ecosystem, including the free STM32CubeMX configuration tool, STM32CubeIDE integrated development environment, and the STM32CubeG4 firmware package. If you have previously worked with STM32F3 or STM32F4 series, a large portion of HAL code can be reused; the main adjustments involve analog‑peripheral configuration and pin mapping. Official example projects and reference designs for digital power and motor control are also provided to accelerate development.

10. If I later need more I/Os or larger Flash, what upgrade options are available?
If you need more I/Os, you can directly upgrade to the LQFP‑64 STM32G474RET6 (up to 51 I/Os) or the LQFP‑100 VET6 (up to 82 I/Os), which retain identical Flash and analog features. For larger program storage, the CET6 already provides 512 KB Flash, so if even more is needed, consider moving to the STM32H7 series (such as the STM32H723 or H743), which also offer LQFP‑48 or LQFP‑64 packages with higher core frequencies and richer SRAM. Because all these devices belong to the same STM32 ecosystem, code and hardware designs can be highly reused, and migration effort is minimal.