The STM32G4 family from STMicroelectronics combines fast control execution, rich analog integration and scalable timer resources for motor-drive designs. This family has three branches. They all run on an Arm Cortex-M4© core with a floating-point unit that can go up to 170MHz. They also have filter mathematical accelerator hardware, which means they can do control loop maths, coordinate transforms and digital filtering really quickly. This is faster than what a regular microcontroller can do.
The main difference between the STM32G4 lines is the timer set. The STM32G4x1 and STM32G4x3 have three 16-bit motor control timers, which is enough for a lot of inverter and servo tasks. The STM32G4x4 line has a high-resolution timer with 184ps resolution and 12 PWM outputs. This makes the STM32G4x4 line the choice when you need really precise switching and waveform shaping.
In the end the choice between the STM32G4 lines is about how analog density, connectivity and timing granularity the control stage needs. The STM32G4 family is really flexible. Can be used for a lot of different motor drive designs.
Product Family | Where It Fits Best | Memory | Analog Resources | Package range |
STM32G4X1 | Compact and cost-sensitive single-axis drives | 256KB to 512KB Flash,[Text Wrapping Break]112KB SRAM | 3 ADCs, 4 comparators, 4 operational amplifiers, 4 DAC channels | 32-pin to 100-pin |
STM32G4X3 | Richer sensing and connectivity for broader drive designs | 128KB to 512KB Flash,[Text Wrapping Break]128KB SRAM | 5 ADCs, 7 comparators, 6 operational amplifiers, 7 DAC channels | 48-pin to 128-pin |
STM32G4X4 | Higher-end waveform generation and digitally controlled power stages | 512KB Flash,[Text Wrapping Break]128KB SRAM | 5 ADCs, 7 comparators, 6 operational amplifiers, 7 DAC channels | 48-pin to 128-pin |
Whichever line fits the application, the X-CUBE-MCSDK software expansion supports field-oriented control, sensorless operation, Hall and encoder feedback, motor profiling, and real-time tuning through Motor Control Workbench.
