EVB90620 Datasheet, PDF (15/39 Pages) Melexis Microelectronic Systems – High precision non-contact temperature measurements

MLX90620
16x4 IR array
V_TH 25 256.V_{TH _ H} V_{TH _ L} 256.26 120 6776 , decimal value
Sign check 6776 32767 V_TH 25 6776
K_T1
256.K_{T1_ H} K_{T1_ L}
2¹⁰
256.91 51 23347
1024
1024
Sign check 23347 32767
K_T1
23347
1024
22.7998
K_{T 2}
256.K_{T 2 _ H} K_{T 2 _ L}
2 ²⁰
256.237 204 60876
1048576 1048576
Sign check 60876 32767
K_{T 2}
60876 65536 4660
1048576 1048576
Let’s assume that the input data is:
PTAT _ data 0x1AC0 = 6848 dec
0.0044441
Thus the ambient temperature is:
Ta
K_T1
K
T
2
1
4K_{T 2} V_TH (25)
PTAT _ data
2K_{T 2}
22.7998 519.8309 4( 0.0044441) 6776 6848
Ta
25
0.0088882
22.7998 519.8309 0.0177764 72
Ta
25
0.0088882
Ta ^{22.7998 518.551} 25
0.0088882
Ta 28.16 C
22.7998 22.7717 _{25 3.16 25}
0.0088882
3001090620
Rev 4.0
Page 15 of 40
Datasheet IR16x4
19 September 2012