TMAG5170-Q1: Accuracy for angle messurement with 0.5°

Jonathan Navor

Part Number: TMAG5170-Q1

Tool/software:

Hi Experts,

Good day!

Customer want to use the TMAG5170-Q1 in an electric cooling valve driven by an axial flux pmsm. For absolut angle messurement with 0.5° precision. I cant find any specific information about the accuracy of the TMAG5170-Q1 in the datasheet and wonder how it depends on the positon of the sensor to the magnet.

Any additional information would be helpful. Thank you in advance.

Regards,

Jonathan

over 1 year ago

+1 Scott Bryson over 1 year ago

TI__Mastermind 21120 points

Jonathan,

Thanks for reaching out on E2E. There are a handful of plots in the datasheet:

These plots are taken from an On-Axis alignment with gain and offset corrected.

The output LSB of the angle register is 0.25 degrees, and can be calculated using the equation here:

You can get a smaller step size, however, if you run the angle calculation in the MCU. Typically the atan2 function is not optimized for speed, so you can get better results implementing the CORDIC algorithm on the MCU. There is an example in the code sample here:

https://www.ti.com/tool/download/TMAG5170-CODE-EXAMPLE/1.0.0

Thanks,

Scott

0 Jonathan Navor over 1 year ago in reply to Scott Bryson

TI__Genius 9475 points

Hi Scott,

Thank you for this helpful information.

Regards,

Jonathan

Sensors

Sensors forum

TMAG5170-Q1: Accuracy for angle messurement with 0.5°