MLX90364 Datasheet, PDF (24/36 Pages) Melexis Microelectronic Systems – Triaxis® Position Sensor Assembly

MLX90364
Triaxis® Position Sensor Assembly
increment is bigger than the hysteresis. The hysteresis filter reduces therefore the resolution to a level
compatible with the internal noise of the IC. The hysteresis must be programmed to a value close to the
noise level. (1 lsb = +/- 0.012%)
15.6.2. FIR Filters
The MLX90364 features 2 FIR filter modes controlled with Filter = 1…2. Filter = 0 corresponds to no
filtering. The transfer function is described below:
∑ ¹
y_n = _j
j
a_i x_n−i
∑ a i=0
i
i=0
The filters characteristics are given in the following table:
Filter No
j
Type
Coefficients ai
Title
99% Response Time
Efficiency RMS (dB)
0
0
Disable
1
No filter
1
0
1
2
1
3
Finite Impulse Response
11
1111
ExtraLight
Light
2
4
3.0
6.0
30000
20000
Digital value
[16bits]
10000
No filtering
FIR2 [1111]
FIR1 [11]
0
0
MLX90364
Rev 4.1
10
20 Time [samples] 30
40
Figure 7: Step and impulse response of the different filters
Page 24 of 36
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Datasheet
19/11/2015