This application note introduces the application of microstepping motor drive with STM8A and STM8S microcontrollers. It describes the characteristics and applications of stepper motors, as well as methods to increase the resolution of stepper motor drives. It also mentions the availability of dedicated stepper motor controllers/ICs on the market and the demand for stepper motors with a lower current rating in applications such as automotive dashboards.
Stepper motors are electrically powered devices used for precise motion control in applications like printers, disk drives, and automotive dashboards. While dedicated controllers exist, this document presents a low-cost software solution to drive these motors directly using the pulse-width modulation timers and I/O pins found within STM8 microcontrollers.
The note covers three main types of stepper motors: variable-reluctance (VR), permanent magnet (PM), and hybrid synchronous motors. It details the winding arrangements for two-phase motors, explains the concept of microstepping to achieve smoother rotation and better positioning, and provides a software description for implementing this drive method on STM8A and STM8S devices.
It reduces hardware cost and complexity by using internal resources like PWM timers, allowing the CPU to perform other control activities.
The document focuses on driving stepper motors using STM8A and STM8S devices.