For accurate angle measurement, the two axes amplitudes must be normalized by selecting the proper gain adjustment value in the MAG_GAN_CONFIG register. The gain adjustment value is a fractional decimal number between 0 and 1. The following steps must be followed to calculate this fractional value:

1. Set the device at 32x average mode and rotate the shaft a full 360 degree.
2. Record the two axes sensor ADC codes for the full 360 degree rotation.
3. Measure the maximum peak-peak ADC code delta for each axis, Ax and Ay, as shown in Figure 7-6 or Figure 7-7.
4. Calculate the gain adjustment value for X axis:
   Equation 11. ${\mathrm{G}}_{\mathrm{X}}=\frac{{\mathrm{A}}_{\mathrm{Y}}}{{\mathrm{A}}_{\mathrm{X}}}$
5. If G_X>1, apply the gain adjustment value to Y axis:
   Equation 12. ${\mathrm{G}}_{\mathrm{Y}}=\frac{1}{{\mathrm{G}}_{\mathrm{X}}}$
6. Calculate the target binary gain setting at the GAIN_VALUE register bits:
   Equation 13. G_X or G_Y = GAIN_VALUE_decimal / 1024

Example 1: If A_X = A_Y = 60,000, the GAIN_SELECTION resister bits can be set as 00b. The GAIN_VALUE register bits are don't care bits in this case.

Example 2: If A_X= 60,000, A_Y = 45,000, the G_X = 45,000/60,000 =0.75. Select 01b for the GAIN_SELECTION register bits.

Example 3: If A_X= 45,000, A_Y = 60,000, the G_X = (60,000/45,000) =1.33. Since G_X >1, the gain adjustment needs to be applied to Y axis with G_Y =1/G_X. Select 10b for the GAIN_SELECTION register bits.