Stepper Motor Driver

[carlson]

Could someone please help me with the logic circuit required to drive a 3 volt 10ohm motor in a forward direction only via this IC

A relay will be used on the power input or output to control the motor with a photo interrupter unless the stop function is ultra easy via the photo interrupter controlling the logic stop mode

BA6845FS Datasheet pdf - Magnetic Disk LSIs > FDD stepping motor driver - ROHM

Many thanks in anticipation

 

[Chippie]

Could someone please help me with the logic circuit required to drive a 3 volt 10ohm motor in a forward direction only via this IC

Look at the first line of the truth table...It tells what pins need to be hi/lo to make the motor go forward......

 

[carlson]

What is the circuit to make the relevant pins go hi and lo

 

[Wp100]

You need two switches as shown, - one connected to pins 4,5 and one to pins 12,13

 

[carlson]

So the Pins need to be switched to cause the motor to run and the speed depends on the rate of switching?

 

[Wp100]

Using switches will send the motor at full Vcc speed.

If you want to control the motor speed then you have to use PWM or something similar - a way of sending switched pulses to the Driver chip.

Searching this forum on Stepper Motor Drivers will give you a better idea - a popular combination is the L297 logic chip with the L293/8 drivers

 

[carlson]

How do I use this photo interrupter circuit (without relay) to pull pins 12/13 (in12/22) low when beam blocked and high when beam not blocked.

Silicon Chip Online - Circuit Notebook

 

[Chippie]

Hmm...No link!

 

[carlson]

Silicon Chip Online - Circuit Notebook