MLX90614_15 Datasheet, PDF (13/51 Pages) Melexis Microelectronic Systems – Single and Dual Zone Infra Red Thermometer in TO-39

MLX90614 family
Single and Dual Zone
Infra Red Thermometer in TO-39
On-chip filtering and settling time:
The MLX90614 features configurable on-chip digital filters. They allow customization for speed or noise.
Factory default configurations and the typical settling time and noise for the MLX90614 family are given below.
Device
MLX90614AAA, BAA, DAA
MLX90614ABA, BBA
MLX90614ACC, BCC, DCC
MLX90614ACF, BCF
MLX90614DCH, DCI, BCH, BCI
Settling time, sec
0.10
0.14
0.14
1.33
0.65
Typical noise, °C rms
0.05
0.07
0.18
0.10
0.10
Spike limit
100%
100%
100%
50%
80%
Table 8: factory default IIR and FIR configuration, settling time and typical noise
Details on the filters are given in the application note “Understanding MLX90614 on-chip digital signal
filters” available from www.melexis.com.
The evaluation board, EVB90614 supported by PC SW allows easy configuration of the filters, while not
requiring in-depth understanding of the EEPROM.
The available filter settings and the settling times are listed below. Settling time depends on three
configurations: single / dual zone, IIR filter settings and FIR filter settings. The FIR filter has a straight forward
effect on noise (4 times decreasing of filter strength increases the noise 2 times and vice versa. The IIR filter
provides an additional, spike limiting feature. Spike limit defines the level of magnitude to which the spike would
be limited – for example, 25% denotes that if a 20°C temperature delta spike is measured the temperature
reading by the MLX90614 will spike only 5°C.
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)
90614xAx
0.04
0.05
0.06
0.10
0.12
0.16
0.22
0.35
0.24
0.30
0.43
0.70
0.26
0.34
0.48
0.78
0.30
0.37
0.54
0.86
0.70
0.88
1.30
2.00
1.10
1.40
2.00
3.30
1.50
1.90
2.80
4.50
Settling time (s)
90614xBx, 90614xCx
Not recommended
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
Table 9: 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.
Spike limit
100.00%
100.00%
100.00%
100.00%
80.00%
80.00%
80.00%
80.00%
66.70%
66.70%
66.70%
66.70%
57.00%
57.00%
57.00%
57.00%
50.00%
50.00%
50.00%
50.00%
25.00%
25.00%
25.00%
25.00%
16.70%
16.70%
16.70%
16.70%
12.50%
12.50%
12.50%
12.50%
3901090614
Rev 009
Page 13 of 52
Data Sheet
June 29, 2015