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ZHCSQY7 september 2022 TMAG5173-Q1

ADVANCE INFORMATION

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- MPDS026Q

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7.5.2.4 Magnetic Sensor Offset Correction

The TMAG5173-Q1 enables offset correction for a pair of magnetic axes (see Figure 7-19). The MAG_OFFSET_CONFIG_1 and MAG_OFFSET_CONFIG_2 registers store the offset values to be corrected in 2's complement data format. As an example, if the uncorrected waveform for a particular axis has a value that is +2 mT too high, the offset correction value of –2 mT should be entered in the corresponding offset correction register. The selection and order of the sensors are defined in the ANGLE_EN register bits setting. The default value of these offset correction registers are set as zero.

Figure 7-19 Magnetic Sensor Data Offset Correction

Use Equation 16 to calculate the amount of offset for each axis. As an example, with a ±40 mT range, MAG_OFFSET_CONFIG_1 set at 1000 0000b, and MAG_OFFSET_CONFIG_2 set at 0001 0000b, the offset correction for the first axis is −2.5 mT and second axis is 0.312 mT.

Equation 16.

∆_{O f f s e t} = \frac{- (D_{7} \times 2^{7}) + \sum_{i = 0}^{6} D_{i} \times 2^{i}}{2^{12}} \times 2 |B_{R}|

where

Δ_Offset is the amount of offset correction to be applied in mT.
D_i is the data bit in the MAG_OFFSET_CONFIG_1 or MAG_OFFSET_CONFIG_2 register.
B_R is the magnetic range in mT for the corresponding channel.

Alternately, you can use Equation 17 to calculate the values for MAG_OFFSET_CONFIG_1 or MAG_OFFSET_CONFIG_2 for a target offset correction.

Equation 17.

M A G_O F F S E T = \frac{{2^{12} \times ∆}_{O f f s e t}}{2 |B_{R}|}

where

MAG_OFFSET is the decimal value to be entered in the MAG_OFFSET_CONFIG_1 or MAG_OFFSET_CONFIG_2 register.
Δ_Offset is the amount of offset correction to be applied in mT.
B_R is the magnetic range in mT for the corresponding channel.