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External DRV8885 DAC

user5287685
Prodigy 160 points
Part Number: DRV8885
①I want to set two motor driver current values with DAC1ch of MCU.
The two current values are the same.
Have you changed the formula on page 19 of the data sheet?
It is necessary to calculate each current value.
②
When setting a fixed current value, can it be set by resistive voltage division?
  • 0
    TI__Guru** 114905 points

    Hi user5287685,

    ①I want to set two motor driver current values with DAC1ch of MCU.
    The two current values are the same.
    Have you changed the formula on page 19 of the data sheet?
    It is necessary to calculate each current value.
    Please confirm the revision of the datasheet. The most current datasheet is SLVSD39C.
    If you want two motor driver current values, the VDAC value must be calculated.
    Use equation one to calculate the DAC voltage based on the RREF resistor in the system.
    Changing the DAC voltage acts as a variable resistor to change the reference current.
    ②
    When setting a fixed current value, can it be set by resistive voltage division?
    A single resistor to ground is needed to set a fixed current. Use equation 1 to calculate the resistor value needed.