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How to measure phase current when using DRV8711

Yunlong Wang85
Intellectual 290 points
Other Parts Discussed in Thread: BOOST-DRV8711, DRV8711

Hi, I am studying the article,  "Spin It! - Get Your Own Stepper Motor BoosterPack! BOOST-DRV8711", whose webpage link is "https://e2e.ti.com/blogs_/b/motordrivecontrol/archive/2014/07/03/spin-it-get-your-own-stepper-motor-boosterpack-boost-drv8711?DCMP=mdrvblog&HQS=hval-mdbu-amd-mdrvblog-150520-drv8711boosterpack-pf-en". I hope to know, what kind of TEK digital oscilloscope and which pins of "BOOST-DRV8711 and MSP-EXP430G2" may I measure to get the current waveform? Thank you.

  • 0
    TI__Mastermind 21305 points

    Hi Yunlong,

    We use a current probe directly on the motor phase wires to measure winding current. Most mid to high end o-scopes support this type of tool.

    We specifically used a TCP0030A current probe with a DPO5000 Tek scope.

  • 0 in reply to Nicholas Oborny
    Intellectual 290 points

    Thank you, Nicholas :)

    I still have a question about phase current of DRV8711.

    When I study the datasheet of DRV8711, I find that there are pins, xISENP, xISENN and Risense, as displayed below.

    May I measure  xISENP, xISENN directly to get value of phase current, using TEK oscilloscope in voltage mode? As I find that I do not have a current probe.

    Moreover, I find that the place where Risense is put make the current, running through Risense,  only have positive value, right?

    Thank you.