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DRV5055-Q1: APPLICATION

Colt Zhang
Expert 4955 points
Part Number: DRV5055-Q1
Other Parts Discussed in Thread: DRV5055, TMAG5170, TMAG6180

Tool/software:

HI EXPERT,

my customer want to use this sensor to detect the position of step motor, accuracy need to 2%, if this device can use in this condition, do you have any recommendation? 

  • 0
    TI__Mastermind 20950 points

    Colt,

    Thanks for reaching out on E2E.  The DRV5055 can detect the position of a rotating magnet, but for a full 360° rotation, this typically requires a second device offset by 90 degrees around the magnet.  This creates a sine + cosine output relationship between the two devices which can be used to generate an angle measurement.  Otherwise, a single sensor is really only able to reliably measure up to 180 degrees.

    It may also be worth considering a 3D sensor such as TMAG5170 or TMAG5173 for this purpose.  These detect the x,y, and z component of the magnetic field, and this can be used to generate the same sine and cosine outputs with a single device.  These devices also have integrated angle calculations which can help reduce the load on the MCU.

    Another option is to consider a device such as TMAG6180 which is an AMR angle sensor.  This device needs to be placed on-axis to achieve its best result.  You can find more about using these devices from the content below:

    https://www.ti.com/lit/ab/sbaa503b/sbaa503b.pdf

    https://www.ti.com/lit/an/sbaa463a/sbaa463a.pdf

    https://www.ti.com/video/6350199352112

    Thanks,

    Scott