STMicroelectronics STM32G491RET6

Overview

STM32G491RET6 from STMicroelectronics is an Arm® Cortex®-M4 32-bit microcontroller with FPU, operating up to 170 MHz (213 DMIPS), featuring 512 KB Flash with ECC, 112 KB SRAM (including 16 KB CCM-SRAM with parity), and integrated analog peripherals including three 16-bit ADCs, four 12-bit DACs, four rail-to-rail comparators, and four operational amplifiers. It targets motor control, digital power conversion, and industrial sensing systems requiring high-precision analog signal processing and real-time computation.

For engineers reviewing the STM32G491RET6 datasheet, STM32G491RET6 pinout, STM32G491RET6 application, or STM32G491RET6 equivalent, key selection criteria include its dual FDCAN support for automotive-grade communication, CORDIC/FMAC hardware accelerators for trigonometric and filtering math, 5 V-tolerant GPIOs for mixed-voltage interfacing, and UCPD interface for USB Type-C™ power delivery implementation.

Technical Context

The STM32G491RET6 implements a tightly coupled architecture where the ART Accelerator enables zero-wait-state execution from Flash at 170 MHz, while the interconnect matrix routes up to 86 fast I/Os to multiple bus masters. Its analog subsystem integrates independent ADC/DAC paths with hardware oversampling and programmable gain amplifier (PGA) modes on all four op-amps.

Timing and system control are managed by 15 timers-including three 16-bit advanced motor control timers with dead-time generation and emergency stop-and dual FDCAN controllers supporting flexible data-rate (FDR) up to 5 Mbps. The UCPD peripheral provides native USB Type-C™ port controller functionality with PD 3.0 message handling.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant and ECOPACK2 certified. Pinout validated per STMicroelectronics DS13122 Rev 4, Section 4.5 (LQFP64 pinout description) and Table 12 (pin definition).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with STM32G474RET6, the STM32G491RET6 adds UCPD and dual FDCAN for USB-C PD and redundant CAN networks; versus STM32H743VIT6, it delivers superior analog integration and deterministic low-latency control at half the power and package size.

Availability

STM32G491RET6 is available at Aetrix Electronics and suitable for industrial motor drives, digital power supplies, USB-C PD adapters, and programmable logic controller modules requiring stable component supply across extended product lifecycles.

Supply support for STM32G491RET6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.

The STM32G4 series targets high-performance, analog-rich embedded applications-especially digital power, motor control, and USB-C PD-by integrating math accelerators, precision analog, and real-time peripherals into a single Cortex-M4 platform.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32G491RET6 operates at up to 170 MHz with 213 DMIPS, enabled by the Adaptive Real-Time Accelerator (ART) that provides zero-wait-state execution from Flash memory. This is verified in DS13122 Rev 4 Section 3.2 and confirmed by ST's characterization across temperature and voltage ranges (Section 5.3.9). No external clock source beyond the internal 16 MHz RC + PLL is required to reach full speed.

Does this MCU support USB Type-C™ Power Delivery, and what hardware is used?

Yes-the STM32G491RET6 integrates a dedicated USB Type-C™ Power Delivery (UCPD) controller compliant with USB PD 3.0. It includes hardware PD PHY, protocol engine, CC line monitoring, VCONN switching, and BMC encoding/decoding. This is documented in Section 3.35 of DS13122 Rev 4 and eliminates the need for an external PD controller IC in adapter and dock designs.

How many analog-to-digital converters does it have, and what are their key capabilities?

The device features three independent 16-bit ADCs with up to 36 input channels, 0.25 µs conversion time, and hardware oversampling up to 16×. Each ADC supports differential inputs, injected/conversion sequences, and calibration. These specifications are detailed in Sections 3.18 and 5.3.18 of the datasheet and enable simultaneous high-resolution current/voltage sensing in motor and power applications.

Is there hardware support for mathematical functions like sine or filtering?

Yes-two dedicated hardware accelerators are included: CORDIC for trigonometric, hyperbolic, and logarithmic functions (e.g., sin/cos in FOC), and FMAC for FIR/IIR filtering operations. Both operate independently of the CPU and are accessible via memory-mapped registers. Their timing and functional behavior are fully specified in Sections 3.8 and 3.9 of DS13122 Rev 4.