MLX90616 Datasheet, PDF (12/36 Pages) Melexis Microelectronic Systems – Infra Red Thermometer in TO-39 for high temperature thermometer guns

MLX90616ESF-HCA
Infra Red Thermometer in TO-39
for high temperature thermometer guns
8.3.4 On-chip filtering and settling time:
The MLX90616 features configurable on-chip digital filters. They allow customization for speed or noise.
Details on the filters are given in the application note “Understanding MLX90616 on-chip digital signal filters”
available from www.melexis.com .
The available filter settings and the settling times they give are listed below. Settling time depends on two
configurations: IIR filter settings and FIR filter settings. The FIR filter has a straightforward effect on noise (a 4
times decrease of settling time increases the noise 2 times and vice versa). The IIR filter provides an
additional, spike limiting, feature. Spike limit is also listed and defines to what level the magnitude of a spike
would be limited – for example, 25% denotes that if a 20°C temperature delta spike is measured the
temperature reading by the MLX90616 will spike only 5°C. More details are available in the application notes
from www.melexis.com.
IIR setting
xxx
100
100
100
100
101
101
101
101
110
110
110
110
111
111
111
111
000
000
000
000
001
001
001
001
010
010
010
010
011
011
011
011
FIR setting
000…011
100
101
110
111
100
101
110
111
100
101
110
111
100
101
110
111
100
101
110
111
100
101
110
111
100
101
110
111
100
101
110
111
Settling time (s)
0.06
0.07
0.10
0.14
0.20
0.24
0.34
0.54
0.38
0.48
0.67
1.10
0.42
0.53
0.75
1.20
0.47
0.60
0.84
1.33
1.10
1.40
2.00
3.20
1.80
2.20
3.20
5.00
2.40
3.00
4.30
7.00
Spike limit
100.0%
100.0%
100.0%
100.0%
80.0%
80.0%
80.0%
80.0%
66.7%
66.7%
66.7%
66.7%
57.0%
57.0%
57.0%
57.0%
50.0%
50.0%
50.0%
50.0%
25.0%
25.0%
25.0%
25.0%
16.7%
16.7%
16.7%
16.7%
12.5%
12.5%
12.5%
12.5%
Table 7: possible IIR and FIR settings
Note: Settling time is in seconds and depends on internal oscillator absolute value.
100% spike limit appears with the IIR filter bypassed, and there is no spike limitation.
3901090616
Rev 002
Page 12 of 36
Data Sheet
August 20, 2012