DRV425: Calculate Vout for a given B field with two different Rshunt values

Hello Eduardo,

Thanks for using the forum to get answers to your questions.

In our DRV425 Tools & Software tab you can find a calculator that will help with this.(DRV425 System Parameter Calculator)  The calculator will also help you see if you will have any design issues and other information.  Please note the output is ± due to the fact the field can be positive or negative and the output is centered around Vref.

The calculation can also be done with Equation 1 of the data sheet.

Vout = B × G × Rshunt × Gamp

B= 0.05mT  (or other field to be measured)

G = 12.2mA/mT

Rshunt= 100Ω or  330Ω

Gamp = 4 V/V

Vout(100Ω, 0.05mT) =  ±0.244 V +Vref

Vout(330Ω, 0.05mT) =  ±0.805 V +Vref