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DRV5056: DRV5056-A1

Part Number: DRV5056
Other Parts Discussed in Thread: DRV5055

From a former request. I did not get a clear answer to my question:

"See attached scope image (yellow trace) - this shows the actual output from the Hall sensor, where N and S magnetic fields are detectable. I just want to make sure its within the parts capability to detect a North field.

Can the DRV5056 detect low levels of North and South polarity?  Yes the linearity will not be there. Does anyone on the production floor for these parts know if the parts are tested for low levels (say <4mT) North and South polarity?

Sadly this is the only solution from TI I can find to meet my needs of high sensitivity of both polarity detection schemes.

Thanks 

  • Bhaktprahash,

    I'm sorry you didn't feel that your question was answered in your previous post:

    https://e2e.ti.com/support/sensors-group/sensors/f/sensors-forum/1109932/drv5056-drv5056-a1

    I believe this is the post and plot in question.

    As mentioned in the previous request, driving the device with a N pole on the magnet is possible to some extent using low level input since the Quiescent output voltage is set to the edge of the linear output region.  If you are willing to operate within the claw portion of the output curve, then you might be able to use the device this way.

    From your plot, it appears that the output is not terribly distorted, but it is difficult to know how reliable your results would be in large scale use.  It is difficult to approximate how close you are to exceeding the usable output range of the device. Since the clipping voltage is not specified, it is also not likely that any production level testing occurs to measure this voltage. Typical tests would include magnetic inputs within the recommended operating region of the device.

    I do understand the difficultly finding alternate devices.  Currently at the time of posting, I am seeing some availability of DRV5055 on https://www.ti.com/product/DRV5055.  This device would be more ideal for this configuration.

    If you have any follow up questions, please feel free to follow up on this same thread.

    Thank you,

    Scott