Its core runs at 170 MHz with a single-precision FPU, which directly determines how fast a PID loop or sensor fusion algorithm can execute.
Analog peripherals: 19 ADC channels and 4 DAC outputs
This part carries 19 multiplexed 12-bit ADC channels and four 12-bit DAC outputs. For a three-phase motor controller, that means one ADC channel per phase current plus room for DC-link voltage and temperature sensing, with DACs available for analog setpoint generation or offset trimming. The 12-bit resolution is adequate for 0.1% accuracy in most industrial feedback loops; if higher precision is needed, the external reference pin lets you improve the ADC's effective resolution beyond the internal Vref.
The exposed pad also improves EMI by providing a low-inductance ground return for the high-speed I/O.
For dual-sourcing resilience, the STM32G491 line includes multiple density and package variants that share the same peripheral set and pinout across the UFQFPN-48 footprint — a BOM can be qualified across the family without a board respin.