MLX90363 Datasheet, PDF (41/57 Pages) Melexis Microelectronic Systems – Triaxis® Magnetometer IC With High Speed Serial Interface

MLX90363
Triaxis® Magnetometer IC
With High Speed Serial Interface
17.5. User Configuration: Filter
The MLX90363 features 3 FIR filter modes controlled with Filter = 1…3. The transfer function is described
below:
∑ ^{∑ yn =}
1
j
j
a_i x_n−i
a i=0
i
i=0
The characteristics of the filters No. 0 to 3 is given in the following table.
Filter No. (j)
Type
Coefficients a0… a5
Title
99% Response Time
Efficiency RMS (dB)
0
Disable
N/A
No Filter
1
0
1
2
3
Finite Impulse Response
11
1111
12221
Extra Light
Light
Medium
2
4
5
3.0
6.0
6.6
Digital value [16bits]
30000
Step and impulse response of the 3 different filters
20000
10000
No filtering
FIR2 [1111]
FIR1 [11]
FIR2 [12221]
0
0
10
20 Time [samples] 30
40
50
17.6. Virtual Gain Min and Max Parameters
The MLX90363 automatic gain control (AGC) loop selects the electrical gain code within the user-defined
range VIRTUALGAINMIN…VIRTUALGAINMAX. Setting VIRTUALGAINMIN=VIRTUALGAINMAX means
setting a fixed gain. The min and max virtual gain codes influence directly the sensitivity of the diagnostics
D17-“Field Magnitude Too High” and D18-“Field Magnitude Too Low”.
3901090363
Rev. 005
Page 41 of 57
Data Sheet
Jul/13