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DRV8703-Q1: current sense amplifier to determine direction

Viktorija Cecil
Mastermind 18491 points
Part Number: DRV8703-Q1
Other Parts Discussed in Thread: DRV8706-Q1

Is it possible to place the current sense resistor in series with the motor to determine the direction? Is there an internal offset in this case of 2.5V?

For example, current sense output voltage above 2.5V means motor is rotating clockwise, less than 2.5V means motor is rotating counter clockwise.

  • 0
    TI__Guru 56650 points

    Viktorija,

    DRV8703-Q1 cannot place the current sense resistor in series with the motor to determine the direction.

    DRV8706-Q1 (https://www.ti.com/lit/ds/symlink/drv8706-q1.pdf) may meet your requirement.

    The DRV8706-Q1 differential shunt amplifier gain and shunt resistor value are selected based on the dynamic current range, reference voltage supply, shunt resistor power rating, and operating temperature range. In bidirectional operation of the shunt amplifier, the dynamic range at the output is approximately calculated as VSO_BI = (VAREF - 0.25 V) - (VAREF / 2). The output of the amplifier can swing from the midpoint reference (VAREF / 2) to either 0.25V or VAREF - 0.25V depending on the polarity of the input voltage to the amplifer.