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Mainstream Arm Cortex-M4 MCU 170 MHz with 256 Kbytes of Flash memory, Math Accelerator, High Analog level integration

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Product overview


The STM32G491xC/xE devices are based on the high-performance Arm® Cortex®-M4 32-bit RISC core. They operate at a frequency of up to 170 MHz.

The Cortex®-M4 core features a single-precision floating-point unit (FPU), which supports all the Arm single-precision data-processing instructions and all the data types. It also implements a full set of DSP (digital signal processing) instructions and a memory protection unit (MPU) which enhances the application’s security.

These devices embed high-speed memories (up to 512 Kbytes of flash memory, and 112 Kbytes of SRAM), a Quad-SPI flash memory interface, an extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix.

The devices also embed several protection mechanisms for embedded flash memory and SRAM: readout protection, write protection, securable memory area and proprietary code readout protection.

The devices embed peripherals allowing mathematical/arithmetic function acceleration (CORDIC for trigonometric functions and FMAC unit for filter functions).

They offer three fast 12-bit ADCs (4 Msps), four comparators, four four DAC channels (two external and two internal), an internal voltage reference buffer, a low-power RTC, one general-purpose 32-bit timer, three 16-bit PWM timers dedicated to motor control, seven general-purpose 16-bit timers, and one 16-bit low-power timer.

They also feature standard and advanced communication interfaces such as:

- Three I2Cs

- Three SPIs multiplexed with two half duplex I2Ss

- Three USARTs, two UARTs and one low-power UART.


- One SAI

- USB device


The devices operate in the -40 to +85 °C (+105 °C junction) and -40 to +125 °C (+130 °C junction) temperature ranges from a 1.71 to 3.6 V power supply. A comprehensive set of power-saving modes allows the design of low-power applications.

Some independent power supplies are supported including an analog independent supply input for ADC, DAC, OPAMPs, and comparators. A VBAT input allows backup of the RTC and the registers.

The STM32G491xC/xE family offers 9 packages from 32-pin to 100-pin.

  • All features

    • Includes ST state-of-the-art patented technology
    • Core: Arm® 32-bit Cortex®-M4 CPU with FPU, Adaptive real-time accelerator (ART Accelerator) allowing 0-wait-state execution from flash memory, frequency up to 170 MHz with 213 DMIPS, MPU, DSP instructions
    • Operating conditions:
      • VDD, VDDA voltage range: 1.71 V to 3.6 V
    • Mathematical hardware accelerators
      • CORDIC for trigonometric functions acceleration
      • FMAC: filter mathematical accelerator
    • Memories
      • 512 Kbytes of flash memory with ECC support, proprietary code readout protection (PCROP), securable memory area, 1 Kbyte OTP
      • 96 Kbytes of SRAM, with hardware parity check implemented on the first 32 Kbytes
      • Routine booster: 16 Kbytes of SRAM on instruction and data bus, with hardware parity check (CCM SRAM)
      • Quad-SPI memory interface
    • Reset and supply management
      • Power-on/power-down reset (POR/PDR/BOR)
      • Programmable voltage detector (PVD)
      • Low-power modes: sleep, stop, standby and shutdown
      • VBAT supply for RTC and backup registers
    • Clock management
      • 4 to 48 MHz crystal oscillator
      • 32 kHz oscillator with calibration
      • Internal 16 MHz RC with PLL option (± 1%)
      • Internal 32 kHz RC oscillator (± 5%)
    • Up to 86 fast I/Os
      • All mappable on external interrupt vectors
      • Several I/Os with 5 V tolerant capability
    • Interconnect matrix
    • 16-channel DMA controller
    • 3 x ADCs 0.25 µs (up to 36 channels). Resolution up to 16-bit with hardware oversampling, 0 to 3.6 V conversion range
    • 4 x 12-bit DAC channels
      • 2 x buffered external channels 1 MSPS
      • 2 x unbuffered internal channels 15 MSPS
    • 4 x ultra-fast rail-to-rail analog comparators
    • 4 x operational amplifiers that can be used in PGA mode, all terminals accessible
    • Internal voltage reference buffer (VREFBUF) supporting three output voltages (2.048 V, 2.5 V, 2.9 V)
    • 15 timers:
      • 1 x 32-bit timer and 2 x 16-bit timers with up to four IC/OC/PWM or pulse counter and quadrature (incremental) encoder input
      • 3 x 16-bit 8-channel advanced motor control timers, with up to 8 x PWM channels, dead time generation and emergency stop
      • 1 x 16-bit timer with 2 x IC/OCs, one OCN/PWM, dead time generation and emergency stop
      • 2 x 16-bit timers with IC/OC/OCN/PWM, dead time generation and emergency stop
      • 2 x watchdog timers (independent, window)
      • 1 x SysTick timer: 24-bit downcounter
      • 2 x 16-bit basic timers
      • 1 x low-power timer
    • Calendar RTC with alarm, periodic wakeup from stop/standby
    • Communication interfaces
      • 2 x FDCAN controller supporting flexible data rate
      • 3 x I2C Fast mode plus (1 Mbit/s) with 20 mA current sink, SMBus/PMBus, wakeup from stop
      • 5 x USART/UARTs (ISO 7816 interface, LIN, IrDA, modem control)
      • 1 x LPUART
      • 3 x SPIs, 4 to 16 programmable bit frames, 2 x with multiplexed half duplex I2S interface
      • 1 x SAI (serial audio interface)
      • USB 2.0 full-speed interface with LPM and BCD support
      • IRTIM (infrared interface)
      • USB Type-C™ /USB power delivery controller (UCPD)
    • True random number generator (RNG)
    • CRC calculation unit, 96-bit unique ID
    • Development support: serial wire debug (SWD), JTAG, Embedded Trace Macrocell™
    • All packages are ECOPACK2 compliant

Circuit Diagram

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