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TMAG5213: Application issue

Jeff YANG
Mastermind 7865 points
Part Number: TMAG5213
Other Parts Discussed in Thread: TMAG5231

Tool/software:

Hi,

We want choose TMAG5213 or 5231 to monitor magnet as below figure, the total distance ~6.1754mm. And separated by a PCB in the middle. 

May I know is this distance and placement is fine? How many gauss is needed for the magnet?

Thanks!

Jeff

  • 0
    TI__Mastermind 21120 points

    Jeff,

    I would recommend that the customer explore this question using the TI Magnetic Sense Simulator tool.

    www.ti.com/timss

    The field from the magnet will vary with the shape, size, and material.  They can check the distance they need the sensor to trigger based on their needs here.  I created a starting point they can explore and the file attached below can be imported into the tool.

    Fullscreen TIMSS_Example.json Download 
    {
  "version": "3.4.0",
  "design_name": "",
  "magnet_id": 1,
  "poles": 2,
  "material_id": 4,
  "grade_id": 25,
  "select_remanence": "br_average",
  "remanence": 680,
  "temperature": 20,
  "temperature_coefficient": -0.02,
  "coercivity": 0.38,
  "function_id": 2,
  "magnet_geometry": {
    "magnet_length_x_dim": 4,
    "magnet_length_y_dim": 4,
    "magnet_length_z_dim": 4
  },
  "magnet_position": {
    "x_position": 0,
    "y_position": -4.523,
    "z_position": -7.1
  },
  "magnet_angle": {
    "x_angle": 0,
    "y_angle": 0,
    "z_angle": 0
  },
  "magnet_movement": {
    "final_x_position": 0,
    "final_y_position": -4.523,
    "final_z_position": -15.1
  },
  "sim_setting": {
    "step_size": 1
  },
  "sensor": [
    {
      "sensor_id": "TMAG5213",
      "sensor_position": {
        "x_position": 0,
        "y_position": 0,
        "z_position": 0
      },
      "sensor_angle": {
        "x_angle": 0,
        "y_angle": 0,
        "z_angle": 0
      },
      "custom_inputs": {
        "variant": "TMAG5213AGQDBZR",
        "applied_vcc": 3.3,
        "bop": "bop_high",
        "brp": "brp_low"
      },
      "id": -1
    },
    {
      "sensor_id": "TMAG5231",
      "sensor_position": {
        "x_position": 0,
        "y_position": 0,
        "z_position": 0
      },
      "sensor_angle": {
        "x_angle": 0,
        "y_angle": 0,
        "z_angle": 0
      },
      "custom_inputs": {
        "variant": "TMAG5231B1DQDBZR",
        "applied_vcc": 3.3,
        "bop": "bop_high",
        "brp": "brp_low"
      },
      "id": -2
    }
  ]
}

    What is important to consider is that TMAG5213 is a latch type device.  This sensor requires presenting the sensor with the opposite magnetic field to trigger or release the output.  If the magnet is always presented in the same orientation, then this sensor type will not be a good choice.

    TMAG5231 should work regardless of the magnet orientation.  It will be desirable that in the set position shown, that Bz is greater than BOP Max and that when the magnet is withdrawn that Bz is less than BRP Min.

    Thanks,

    Scott