Item specifics
Description
STM32G431CBT6 Product Overview
STM32G431CBT6 is a Cortex-M4 MCU at 170 MHz with FPU and math accelerator, LQFP-48. 128 KB Flash, 32 KB SRAM, USB 2.0 FS device (crystal-less), CAN FD, two 12-bit ADCs (5 Msps), two 12-bit DACs, four op-amps (PGA), two comparators, 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 STM32G431C8T6 (64 KB Flash), doubles Flash to 128 KB for complex digital power, motor control, and precision sensing applications.
STM32G431CBT6 Core Features
Core: Cortex-M4 170 MHz, FPU + ART Accelerator + Math Accelerator (FMAC, CORDIC)
Memory: 128 KB Flash, 32 KB SRAM
Analog: 2×12-bit ADCs (5 Msps), 2×12-bit DACs, 4×PGAs, 2×Comparators
Motor Control: 2×Advanced Timers (PWM/Deadtime/Brake), 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
STM32G431CBT6 Applications
Digital Power: SMPS, Inverters, PFC
Motor Control: FOC, BLDC/PMSM Drives, Servo Controllers
Instrumentation: High-Precision Sensor Conditioning & Data Acquisition
Consumer Electronics: Drones, Power Tools, Portable Medical
Automotive/Industrial: CAN FD Nodes, Industrial Automation
STM32G431CBT6 Key Advantages
128 KB Flash + 170 MHz Cortex-M4 + FPU + Math Accelerator: Large memory and blazing-fast DSP
4 Op-Amps + 2 DACs + 2 Comparators + ADC: Unmatched analog integration, saves BOM
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 complex control
1.7–3.6 V Wide Supply: Flexible for battery and various power sources
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FAQ
1. What is the STM32G431CBT6, and how does it differ from the G474 series?
The STM32G431CBT6 is a mixed‑signal MCU from ST’s STM32G4 series, featuring a 170 MHz Cortex‑M4 core in an LQFP‑48 package. Compared to the flagship G474, it omits the high‑resolution timer (HRTIM) and has fewer op‑amps/comparators (2 of each vs. up to 5 op‑amps and 7 comparators on the G474), but fully retains 128 KB dual‑bank Flash, 32 KB SRAM, FDCAN, USB‑C, and a 12‑bit 5 Msps ADC. It is purpose‑built for cost‑sensitive applications that need solid real‑time control, rich connectivity, and a compact footprint—such as compact variable‑frequency drives, power tools, drone ESCs, and industrial sensor nodes.
2. What advantages does the LQFP‑48 package offer over the LQFP‑64 (RBT6) in the same series?
The CBT6 uses a 7 mm × 7 mm LQFP‑48 package, which is smaller than the 10 mm × 10 mm LQFP‑64 of the RBT6. All pins are exposed with a 0.5 mm pitch for easy drag‑soldering. It provides up to 38 usable I/Os while still carrying FDCAN, USB‑C, and two op‑amps/comparators, making it a more compact choice for space‑constrained designs. If your application needs no more than 38 I/Os, the CBT6 can significantly shrink your board size while delivering the same processing performance and analog features as the RBT6.
3. Is 128 KB of Flash sufficient, and can it support motor FOC and OTA updates?
128 KB of Flash can accommodate optimized motor FOC algorithms, digital power control firmware (e.g., buck/boost), and a CANopen slave stack. It supports a dual‑bank architecture (64 KB per bank), enabling OTA updates by executing from one bank while programming the other, with automatic rollback on verification failure—guaranteeing the device is never bricked during remote maintenance.
4. What can the built‑in op‑amps and comparators do? Do I still need external analog chips?
The chip integrates two rail‑to‑rail op‑amps and two ultra‑low‑power comparators. The op‑amps can amplify small signals from current‑sense resistors or sensors, while the comparators handle over‑current protection and zero‑crossing detection. Although fewer in number than the G474, they are sufficient for single‑ or dual‑shunt motor control, completely eliminating external op‑amps and comparators and significantly reducing BOM cost.
5. Does this chip support CAN FD? What are its advantages in industrial communication?
Yes, it provides up to three FDCAN controllers, backward‑compatible with CAN 2.0, with data rates up to 5 Mbps and payloads up to 64 bytes. FDCAN dramatically improves real‑time throughput over classic CAN, making it ideal for industrial automation, vehicle networks, and distributed control systems. Even in the LQFP‑48 package, careful pin‑multiplexing allows CAN FD and UART/SPI to coexist for most field‑communication needs.
6. What can the USB‑C interface do? Does it support Power Delivery?
The on‑chip USB‑C 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, without a full USB PD stack. For applications not requiring PD, the MCU can be powered and communicate directly over USB‑C, ideal for portable instruments and small USB‑powered devices.
7. What is its power consumption like? Is it suitable for battery‑powered devices?
The STM32G4 series uses a 90 nm process with a run‑mode current of about 100 µA/MHz. It supports Sleep, Stop, and Standby modes, with Standby current dropping to the micro‑amp range. Combined with fast wake‑up, it is well‑suited for battery‑powered portable industrial equipment and handheld instruments.
8. What development tools are needed, and is it compatible with the previous STM32 ecosystem?
It is fully compatible with the STM32Cube ecosystem, including the free STM32CubeMX and STM32CubeIDE, and the STM32CubeG4 firmware package. Code from STM32F3 or F4 projects can be largely reused, with the main changes being analog‑peripheral configuration and pin mapping. For rapid prototyping, the NUCLEO‑G431KB (LQFP‑32) or NUCLEO‑G474RE (LQFP‑64) boards can serve as a starting point, with smooth code migration to the 48‑pin package.
9. If I later need HRTIM or more analog channels, what upgrade options are available?
You can directly upgrade to the LQFP‑64 STM32G474RET6, which adds the full HRTIM, five op‑amps, seven comparators, and larger Flash/SRAM. Due to the consistent peripheral architecture, code can be highly reused, and hardware changes are minimal. For even more processing power and graphics capability, consider the STM32H7 series.
10. How can OTA update safety and reliability be ensured in the LQFP‑48 package?
The 128 KB Flash’s dual‑bank architecture guarantees OTA safety: new firmware is downloaded to the alternate bank and verified before a boot‑address switch. Any power loss or verification failure triggers an automatic rollback. Combined with code readout protection (RDP) and the Memory Protection Unit (MPU), firmware can be protected against unauthorized access or tampering, making it suitable for compact devices deployed in remote or hard‑to‑service locations.