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Application Note...

A Unipolar Stepper Motor Drive Using the Z8 Encore! MCU...

AN012805-0708...

Stepper motors that feature unipolar drives are widely used in applications that require high torque loads and fast position attainment. The unipolar operation provides stable motor control using a relatively simple firmware, as compared to bipolar drives. This Application Note discusses the use of a typical 8-wire or 6-wire stepper motor, in the unipolar mode of operation, with a Z8 Encore! microcontroller. Also discussed are the practical aspects of the fullstep and half-step methods of driving a stepper motor, as well as a complete hardware and soft MCU. ware implementation using the Z8 Encore! A simple schematic using readily-available components, along with the full source code in C, is used to implement a stepper driver. This basic hardware and software combination can be incorporated into larger control circuits with suitable modifications....

SRAM, and an extensive array of on-chip peripherals. These peripherals make the Z8 Encore! suitable for a variety of applications including motor control, security systems, home appliances, personal electronic devices, and sensors....

Discussion...

A discussion about stepper motors is presented in this section....

General Overview of Stepper Motors...

Stepper motors are characterized by high torque and are capable of handling large loads with precise movements. The advantages of stepper motors over stepless AC or DC motors include No feedback requirement for position or speed control (open loop operation) Noncumulative positional errors Precise electronic speed control using digital technology Compact size for driving large loads at low speeds...

Z8 Encore! Flash MCU Overview...

Zilog's Z8 Encore! products are based on the new eZ8 CPU and introduce Flash memory to Zilog's extensive line of 8-bit microcontrollers. Flash memory in-circuit programming capability allows for faster development time and program changes in the field. The high-performance register-to-register based architecture of the eZ8 core maintains backward compatibility with Zilog's popular Z8 MCU. The new Z8 Encore! microcontrollers combine a 20MHz core with Flash memory, linear-register...

With the advent of microcontrollers, stepper drive technology has advanced rapidly both in terms of flexibility and complexity. The new Z8 Encore! series of Flash microcontrollers enable drive designers to implement full functionality while maintain a low componen...

Document Keywords

A Unipolar Stepper Motor Drive Using the Z8 Encore! MCU web export supplier content zilog 269 pdf zilog an0128

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