Hello,
I am trying to figure out if disabling the Offset Cancellation on the LSM303AGR would impact the wake up trigger mechanism.
From what I could find, the LSM303AGR is an AMR sensor that uses the magneto-resistant property of a film to change its resistance based on the value of an external field. However, a constant bias is present due to imperfections of the sensor and to remove those, a set and reset of the film is performed to create a uniform direction of the resistive elements. When the set and reset functionality is disabled, the film particles will point to arbitrary directions.
This bias is similar to a hard-iron offset that will shift the center of the magnetic sphere, however the sensor imperfections bias can drift with time and temperature.
The trigger mechanism that we are aiming for needs to wake up the MCU when the relative change in the magnetic field exceeds a threshold. So when the threshold includes this constant bias (which could be updated in case it wakes up from a shift due to time or temperature), I assume that this wouldn't affect the trigger in any way if OC is disabled. Is that correct?
Best regards,
Bart
