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DRV8835: PHASE/ENABLE , IN/IN interface for the device DRV8835

Part Number: DRV8835

Hello,

In the datasheet the interface schemes PHASE/ENABLE , IN/IN are said to be common. But I doubt if they are common by that name as a google search does not return relevant information.

Can you  provide more information and/or demo implementation ?

In the DRV8835EVM, the board seems to work with just static switches. So, are PHASE/ENABLE , IN/IN some static digital signals ?  OR they need dynamic modulation over running time ?

Need help really.

P Bhat

  • Hi P Bhat,

    The IN/IN control mode (also known as PWM mode) use IN1 and IN2 as the control signals. As you can see on the control logic table below, xIN1 and xIN2 have to be independently control.

    The Phase/Enable interface mode, uses xPHASE and xENABLE. normally, the xPHASE will be either 0 or 1, to set the motor direction, and xENABLE can be toggle via PWM to enable the outputs. I recommend reading this FAQ to learn about the differences between the two interface modes.

    So, are PHASE/ENABLE , IN/IN some static digital signals ? 

    The signals are not static, you can modulate the the signal duty cycle to modulate the motor speed if needed. However, if all you need is a constant speed, the signals can be tied to either a low or high but you can vary the signal duty cycle to adjust the motor speed.

    I hope this answers your questions.