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TMAG5328: Variation in ADJ resistor value

Conor
Guru 12175 points
Part Number: TMAG5328

Tool/software:

Hi,

I use a variable resistor to adjust Bop on a custom board, taking into account Bop Acc (Radj).

I assembled 40 custom boards and checked the variation in Bop, and found that it was very small, so I am thinking of changing the variable resistor to a fixed resistor when moving to the next prototype.

I understand that Bop Acc (Radj) is ±0.85mT for Bopset (3-4mT).

I would like some advice on whether the variation in this lot just happened to be small, or whether it would be okay to change it to a fixed resistor.

I understand that variation occurs within the specifications of the data sheet, but I have a question.

Thanks,

Conor

  • +1
    TI__Mastermind 23045 points

    Hey Connor,

    Thanks for posting to the sensors forum!

    The +/-0.85mT accounts for any possible process variation that could occur. Typically you would see a nice gaussian distribution similar to what the data you captured, so the possibilities of seeing some on the ends of the +/-0.85mT would be more unlikely.

    My recommendation would be to build based on the specification, so the option on keeping the variable resistor or going to a fixed resistor is dependent your system. If you are able to afford a change in accuracy of up to +/-0.85mT then I think you should be fine moving to a fixed value. But if the actuation point on your system is more sensitive and you require fine tuning the it might be  worth it to keep the adjustable resistor.

    Best,

    Isaac