MAG3110 soft/hard iron

[hjlim]

One of my customer is about to make simple compass using MAG3110.

It just need to indicate the magnetic or true north.

1. In this case, should they use the soft/hard iron compensation?

2. If so, is it possible to perform complicated matrix calculation thru PIC16F1936?

3. Do Freescale provide the equation as a source or library form?

4. Do Freescale provide I2C example code?

[hjlim]

Thank you Tomas,

Please pay attention to the question #2 also.

[TomasVaverka · Accepted solution]

Hi HJ,

1. Generally yes, the magnetometer requires calibrating not only for its own offset but also against spurious magnetic fields resulting from any nearby ferromagnetic components on the PCB. It is a good practice to minimize hard iron interference at the design stage, for more information on layout recommendations please refer to the AN4247.

2. I will let others answer this question.

3&4. Freescale e-compass hard/soft iron compensation software is available as a source code as part of the Sensor fusion offering which uses the PE I2C_LDD component for I2C communication.  

I hope it helps.

Regards,

Tomas

PS: If my answer helps to solve your question, please mark it as "Correct" or “Helpful”. Thank you.