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DRV5055:About sensor sensitivity range

Ayaki Ikejiri
Prodigy 30 points
Part Number: DRV5055

I have a question regarding the error in sensor sensitivity of DRV5055.

For the Z4 type, it is stated that when using a power supply of 3.3V, the sensitivity will be in the range of 7.1mV/mT (min) to 7.9mV/mT (max).

Does the stated error range include ratiometric error and sensitivity linearity error?

If the ratiometric error is maximum (±2.5%), is it possible to exceed 7.9mV/mT or fall below 7.1mVmT?

  • 0
    TI__Mastermind 26335 points

    Hello Ayaki,

    Thank you for considering to use Texas Instruments.  As the DRV5055 is a ratiometric device, the quiescent voltage and sensitivity scale with the supply. Per the Ratiometric Architecture section of the datasheet, the sensitivity ratiometry error provides a means of calculating what the sensitivity might be for supply voltages that deviate from 3.3V or 5V at which sensitivity ranges were defined.  So according to the formula in the Ratiometric Architecture section, if the device has a ratiometric error of +2.5%  and the sensitivity at 3.3V was 7.9mV/mT, we can extrapolate that the sensitivity could be as high as -(.025-1)*3.63V/3.3V*7.9mV/mT=8.47mV/mT when the supply voltage is at 3.63V.  This also means you could have a sensitivity less than 7.1mV/mT if the supply is less than 3.3V.