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Old 12th June 2009, 08:20 AM   #1
Default Stepper Motor Driver

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
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Old 12th June 2009, 11:17 AM   #2
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Quote:
Originally Posted by carlson View Post
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......
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Old 12th June 2009, 11:21 AM   #3
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What is the circuit to make the relevant pins go hi and lo
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Old 12th June 2009, 12:15 PM   #4
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You need two switches as shown, - one connected to pins 4,5 and one to pins 12,13
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Stepper Motor Driver-switch.jpg  

Last edited by Wp100; 12th June 2009 at 12:16 PM.
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Old 12th June 2009, 12:39 PM   #5
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So the Pins need to be switched to cause the motor to run and the speed depends on the rate of switching?
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Old 12th June 2009, 01:20 PM   #6
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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
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Old 13th June 2009, 05:45 AM   #7
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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

Last edited by carlson; 13th June 2009 at 05:50 AM.
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Old 13th June 2009, 09:52 AM   #8
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Hmm...No link!
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Old 13th June 2009, 10:58 AM   #9
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