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TMP006: Calibration issues with negative temperatures

Part Number: TMP006

I'm currently working on a project where a TMP006 will be used to read temperatures that should be 0.5°C accurate whithin the range of -10°C to +10°C.

As I understood from sbou142.pdf, I'm supposed to find a set of constants (A1, A2, B0, B1, B2 and C) so that when I calculate this:

I'll end up with the object temperature in Kelvin, correct ?

For now I have two questions:

1 - Is the Tref mentioned on equations (3) and (4) of the referred document always 25°C regardless of any measurement condition ?

I've made tests changing the environmental conditions and used an external probe to measure the object temperature. Ended up with a table containing sensor data for 7 different Tdie temperatures for a -5°C object, 6 Tdie temperatures for a +10°C object and 6 Tdie temperatures for a +25°C object, a total of 19 points with an average of 30 samples per point.

2 - Is there any algorithm, software, standard excel spreadsheet, website, or anything you recommend so I can calculate the constants ?

Best regards

Alex

Temperatura
da Cápsula °C
Temperatura
do Chip °C
Leitura do IR IR reading
-5,5 5,019 -354,5 -355
-6,6 14,509 -2043 -2043
-5,2 10,002 -1887,6 -1888
-4,6 19,023 -2552,8 -2553
-3,7 25,002 -3806,3 -3806
-4,6 25,012 -3598,9 -3599
-3,2 40,048 -6572 -6572
8,8 5,015 1118,6 1119
10,3 24,509 -2866,7 -2867
9,7 33,096 -4363,2 -4363
10,3 38,002 -5036,7 -5037
8,5 40,136 -5244,2 -5244
9 25 -2469,5 -2470
24,8 40,138 -5313,2 -5313
24,8 35,063 -3210,1 -3210
24,8 25,003 -1647,3 -1647
24,7 30,015 -1954,6 -1955
24,5 19,783 -1497 -1497
24,5 15,005 -876,6 -877