STM32G491REI6

STMicroelectronics · STM32G4 Series

STMicroelectronics STM32G4 series, STM32G491REI6, 32-bit ARM Cortex-M4F MCU, 170 MHz, 512 KB Flash, 112K x 8 RAM, 52 I/O, CANbus/I2C/SPI/USART/USB, 24x12b ADC, 4x12b DAC, -40°C to 85°C, 64-UFBGA (5x5 mm), Tray.

STMicroelectronics STM32G491REI6
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Technical specifications

STM32G491REI6 specifications
Parameter / AttributeSpecification / Value
SeriesSTM32G4
MountingSurface Mount
Oscillator typeInternal
Program memory typeFLASH
Voltage - supply (Vcc (Vdd))1.71V ~ 3.6V
Operating temperature-40°C ~ 85°C (TA)
Speed170MHz
PackageTray
RAM size112K x 8
Core size32-Bit Single-Core
PeripheralsBrown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
ConnectivityCANbus, I2C, IrDA, IRTIM, LINbus, SAI, SPI, UART/USART, USB
Number of i (O)52
Core processorARM® Cortex®-M4F
Case64-UFBGA
Data convertersA/D 24x12b; D/A 4x12b
Program memory size512KB (512K x 8)

Technical details

The 170 MHz clock is the headline number, but the practical gain comes from the Cortex-M4F's DSP extensions and single-cycle MAC. If your firmware runs a PID loop or a floating-point filter, this core saves you the cycle-count gymnastics an M3 or M0+ would need. The 112 KB SRAM gives enough headroom for two 256-point FFT buffers plus the control stack.

Analog peripherals: 24-channel ADC, 4-channel DAC

Twenty-four 12-bit ADC channels and four 12-bit DAC channels are on-chip. For a mixed-signal design like a three-phase motor controller with current sensing on all legs plus a DAC output for an analog reference, you can keep the bill of materials tight — no external ADC or DAC needed. The ADC can sample multiple channels in sequence without CPU intervention via the DMA engine listed in the peripherals block.

64-UFBGA 5x5 mm — layout and rework notes

The 52 I/O count in this package gives enough GPIO for a CAN node with a parallel LCD or a sensor array, but every pin is committed; there's no room for a spare.

On the connectivity side: CANbus, I2C, SPI, UART/USART, and USB are all present, along with SAI for audio serial interfaces and IrDA/IRTIM for infrared. The Brown-out Detect/Reset, POR, and WDT are standard safety peripherals for industrial environments.

It fits factory automation, outdoor telecom cabinets, and HVAC controllers.

STM32G491REI6
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