This chip was specifically designed to interface with the LN stepper motor driver chip, which is also found in the lab. Use Easy Driver to do the same thing. A clock pulse is produced to whose speed is based on the values of a potentiometer connected to Analog pin 0. The part is getting hard to find. Previous post Next post.

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Your email address will not be published. MC package and electrical connections.

The first figure below shows the internal circuitry and the second picture shows a typical setup. The MC is designed to drive a two-phase bipolar stepper motor.

Here we will look at using the advanced features of the Mc while over coming its limitations. You may mf3479 like: Using an H-bridge configuration, there are four transistors for each winding as shown in the first figure below.

Stepper motor driver using MC – Electronic Circuits and Diagrams-Electronic Projects and Design

On the plus side the inputs can be standard TTL 5-volt logic or CMOS, while the power supply must be at least 7-volts or the inputs won’t operate correctly. R1 is a pull up resistor and Rb is used to set the maximum output sink current. This can either be done using a microprocessor or an integrated circuit.


There are many methods of producing the index pulses needed to drive stepper motors. The MC is specifically designed for driving a 2 phase stepper motor in bipolar mode and is available in standard DIP and surface mount packages. H-bridges allow you to choose the direction of the current through the winding. This makes generating pulses easier and also serves to protect against short circuits.

Most indexers have similar inputs and are intended to control the speed and direction of the motor.

Stepper Motor Circuits From Mech. The A and B outputs would correspond to the X and Y inputs on the H-bridge of the first winding see above.

Usin tools Log in. There are several high-level digital inputs that control the speed and direction of the motor. This chip can be used when the total current to each winding is less than milliamps.

To control a stepper motor, you have to energize each winding individually in a specific and timed order.

Stepper Motor Control

The part is getting hard to find. The first one uses a power darlington transistor and the second one uses a power field effect transistor.


Maximum possible current per coil is mA. Vm is the supply voltage itself and Iod is the current per coil.

Stepper Motor Circuits – Northwestern Mechatronics Wiki

The diagram below stpper the typical setup of the circuit. The state change of the output occurs at the low to high transition of the input clock pulse.

The circuit diagram given here is of a stepper motor driver using MC from Motorola. The energizing is accomplished by a driver circuit an amplifier.

If using this material on another site, please provide a link back to my site. A clock pulse is produced to whose speed is based on the values of a potentiometer connected to Analog pin 0. MC universal stepper motor control diagram. The L is a pin DIP chip that was designed specifically to control either unipolar or bipolar stepper motors.

One such chip is the DSwhich is a darlington array, and is shown below. The output can deliver up to mA each of two coils of a 2 phase stepper motor.