DRV5015-Q1: Bob/Brp/Bhys parameters, how to calculate the detection accuracy corresponding to the chip?

Hello Elsa,

Thank you for using the TI forum.

For Bop/Brp/Bhys, you need to design for a "worst case" scenario to ensure that the sensor is always tripped. That means that you you want to look at the max-Bop and the min-Brp (for the A1 device in the table above, that would be ±2mT). You will have to know the strength of your magnet to determine the if it is strong enough/close enough to trip the sensor.

For rotary encoding you can use any number of pole-pares you like, as long as they are not passing over the device faster than the sensor can operate. The parameter to pay attention to for this is the sensing bandwidth (fBW). The DRV5015 has a typical bandwidth of 30 kHz. The value of the pull-up resistor can also affect switching speed.

I am not very familiar with different magnet manufacturers, however I do know that Phoenix America (www.phoenixamerica.com/) will do custom encoding magnets with a large number of magnetic poles.

There is also a list of some various magnet suppliers (as well as other Hall resources) at this forum post (note that some of these may be out of date): e2e.ti.com/.../355909