DRV8840 PWM control

Thomas Mauchien

Prodigy 80 points

Other Parts Discussed in Thread: DRV8842, DRV8801

Hi everyone,

I am switching from the DRV8801 to the DRV8842 because I need more current and I have a question for you guys.

I am trying to get the maxing current I can get. And I want to control the voltage of a DC motor using PWM control.

Do I need to turn on all the Ix [I0...I4] by sending a voltage of 1.67V ?

Thank you in advance for your kind help

Thomas

over 12 years ago

0 Jose Quinones over 12 years ago

TI__Expert 7455 points

Hi Thomas,

For maximum current control, you would set the Ix bits to HI. This device is 3.3V or 5V tolerant, so you would tie the inputs to whatever your application VCC or VDD is.

The Ix inputs are used when driving a bipolar stepper motor with up to 32 degrees of microstepping.

To control the motor speed, you can apply a pair of PWM outputs to the INx pins.

Best regards,

Jose Quinones

0 Thomas Mauchien over 12 years ago in reply to Jose Quinones

Prodigy 80 points

Thanks for the help,

I connected the Ix to VDD and it worked.

Thanks

Motor drivers

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DRV8840 PWM control