The TMAG6180-Q1 is factory-calibrated for best angular accuracy. Some of the electrical errors from the sensor that impact the angle accuracy can be calibrated out for achieving the best performance. Figure 7-13 shows the impact of the different sensor error parameters such as offset, amplitude mismatch and orthogonality error on the angle accuracy.

Figure 7-1 Angle Accuracy Impact Owing to Sensor Electrical Errors (a) Offset Error (b) Amplitude Mismatch Error (c) Orthogonality Error

Based on the parameters defined in AMR Output ParametersHall Sensor Parameters, use Equation 16 to calculate the angle from the AMR sensors.

where

• V_{offset_sin} and V_{offset_cos} are the differential offsets of the sine and cosine outputs
• A_sin and A_cos are the differential amplitude of the sine and cosine outputs

The impact of the angle accuracy owing to the orthogonality error and the hysteresis errors is negligible for the TMAG6180-Q1 and can be ignored.

To calibrate the offset and amplitude mismatch errors, the magnetic field rotates over the entire range and the sine and cosine outputs are sampled continuously to obtain the minimum and maximum values of the outputs.

Users can calculate the average of the minimum and maximum values of the respective outputs across the full angle range to find the offset error of the sine and cosine outputs. Use Equation 17 and Equation 18 to calculate the offset correction parameters for sine and cosine.

Users can calculate the difference of the minimum and maximum values of the respective outputs across the full angle range to find the amplitude of the sine and cosine outputs. Use Equation 19 to calculate the amplitude correction parameters for sine and cosine.