Looking for TTL motor driver help

Discussion in 'The Projects Forum' started by Netwaves, Mar 17, 2015.

  1. Netwaves

    Thread Starter Member

    Feb 9, 2015
    44
    1
    Hello,

    I'm using I2C MCP23017 to control a stepper motor driver. The driver board needs TTL high/low for forward and TTL low/high for reverse. I'm looking for a circuit, maybe a flip flop, so that I only have to use one high/low line from the MCP23017 to cause the driver board lines to flip from high/low to low/high. Anyone know of a circuit or chip that will do what I'm looking for? In case you're interested, I'm using the TA7291S/SG driver chip.

    The logic would look like this:

    H = H/L
    L = L/H

    TIA

    Here is a copy of my current circuit, A, which works fine. And circuit B that would only use one line from the MCP23017. I'm just not sure what to place between the MCP23017 and the TA7291S to make it happen.

    Maybe a NOT gate tied to one? A 74LS04?

    TA7291S-rev1.png
     
    Last edited: Mar 17, 2015
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,509
    2,369
    The typical stepper driver requires either a low or high for each direction and the step series of pulses to control rate or speed.
    Max.
     
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