MLX90363 Datasheet, PDF (40/57 Pages) Melexis Microelectronic Systems – Triaxis® Magnetometer IC With High Speed Serial Interface

MLX90363
Triaxis® Magnetometer IC
With High Speed Serial Interface
17.3.2. Magnetic Angle ∠XZ and ∠YZ
Parameter
SEL_SMISM
SMISM
ORTH_SEL
ORTH_B1B2
MAPXYZ
Address (hex)
1032[15]
1032[14:0]
102C[8]
1026[7:0]
102A[2:0]
Range
0 or 1
[0..2]
0 or 1
[0..2]
1, 2, 4 or 5
Value
0 or 1
TYP = 1.4
1
TYP = 0
1, 2, 4 or 5
If the magnetic angle ∠XZ or ∠YZ is read, Melexis strongly recommends calibrating the front-end
parameters in order to reduce the magnetic accuracy error (see Section 11):
1) Phase Error
B2 = B1 – B2 * ORTH_B1B2 / 1024
Where ORTH_B1B2 is the phase mismatch between the B1 and B2 signals.
2) Sensitivity Mismatch between B1 and B2
The parameter SMISM is selected in such a way that:
i.
Case |B1|>|B2| SEL_SMISM = 0
B1 * SMISM[14:0] / 2^15 and B2 have the same amplitude.
ii.
Case |B1|<|B2| SEL_SMISM = 1
B1 and B2 * SMISM[14:0] / 2^15 have the same amplitude.
17.4. User Configuration: 3D=1 formula trimming parameters KALPHA, KBETA, KT
The values KAPLHA, KBETA and KT are inputs to the 3D formula (see section 17.2) and allow a targeted
reduction of the linearity error through a normalization of the raw signals and a correction prior to the
ATAN function.
Parameter
KAPLHA
KBETA
KT
Value
0 … 2^16-1
0 … 2^16-1
0 … 2^16-1
Range
[0..2]
[0..2]
[0..2]
Typ.
1.4
1.4
1
Note: when not trimmed by the customer, the values per default of KALPHA and KBETA must be
programmed to the TYP. value of 1.4.
3901090363
Rev. 005
Page 40 of 57
Data Sheet
Jul/13