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DRV8432 EVALUATION MODULE

nithyananthan nand
Prodigy 160 points
Other Parts Discussed in Thread: LM3S811, DRV8818

Hi,

 I am using drv8432 evm to drive stepper motor. I am using drv8432 to interface lm3s811 evm kit with stepper motor. I m not clear with the drv8432evm, so would somebody guide me for the problem that i stated below...?

I need to rotate a single stepper motor. The datasheet say i need to supply vs  a max of 52.5v. The stepper motor i am using is required for small load(say 0.5kg).so how much vs should i supply?

Moreover i programmed lm3s811 in such a way to generated 2 pwm signals with duty cycle 25 and 75% respectively. But there are about 4 pwm input pins provided in motor driver evm.(pwm a,b,c and d). Do i need to provide 4 signals to the evm, is that must? Because i need to rotate only one stepper motor to 180deg(semi circle )on the whole and a step instants for 30 deg during every rotation. so should i used all the 4 outputs? And also suggest the stepper motor specification ( 1A or 2A). In case, if am using an 1A motor with driver, how much should i supply for vs?

  • 0
    TI__Guru 55615 points

    Hello,

    Is there a specific reason you chose the lm3s811 device?

    For these currents, a low cost stepper kit based on the MSP430 and DRV8818 driver will easily handle this job.  Apply 24V and watch the motor spin!  

    The DRV8818 includes all the current control and built in logic.  The EVM ships with a GUI to enable operation.

    What is the end application?  Production volume?  

  • 0 in reply to Ryan Kehr
    Prodigy 160 points

    Hello,

     I use the lm3s811evm just to read the LDR sensor voltage and thereby to generate a pwm signal at pw0 and pw1 pins(with 25 and 75% duty cycle) and to rotate the stepper motor to 30 deg.

    I read a document which states that i can use pwm-A and pwm-B pins of the drv8432 evaluation module, where pwm-A drives out-a , out-b and pwm-B drives out-c , out-d..

    is that so?

    I need to rotate my stepper motor in half step sequence. I bought a stepper motor with 6 terminals wires(including a power and gnd).

    can i screw it directly to the out-A,out-B. pvdd-gnd,out-C and out-D ports in the kit?

    or should i use any specific motor for this kit?

  • 0 in reply to nithyananthan nand
    Prodigy 160 points

    additional info about the motor that i have right now: rating- 1A, 12v, 1kg load..

  • 0 in reply to nithyananthan nand
    TI__Guru 55615 points

    DRV8818 is PERFECT!  I would go with that and simplify your life immensely.

  • 0 in reply to Ryan Kehr
    Prodigy 160 points

    So i made a wrong choice, right? but now i have only this drv8432 evm. What should i do then?

    Is there any chance that i could use this evm to driver the stepper motor for which i have given the specifications above.?

    and moreover, how does the duty cycle input controls the step angle of rotation, can you please explain me regarding this.