EVB90620 Datasheet, PDF (17/39 Pages) Melexis Microelectronic Systems – High precision non-contact temperature measurements

MLX90620
16x4 IR array
7.3.3.2 Calculating _(I,j)
Where:
256. _{0 _ H}
0_ L
(i, j)
(i, j)
2 ^{0 _ SCALERE}
2 ^SCALERE
0 _ H ^, 0 _ L ^, (i, j) ^, 0 _ SCALE ^and SCALE ^{are stored in the EEPROM as unsigned values}
All parameters necessary to calculate To are stored into EEPROM at following addresses:
EEPROM address Cell name
0x00…0x3F
0x40…0x7F
A_{i(i, j )}
B_{i(i, j )}
0x80…0xBF
0xD4
(i, j)
A_CP
0xD5
B_CP
0xD6
CP _ L
0xD7
0xD8
0xD9
0xE0
CP _ H
TGC
B_{i _ SCALE}
0_ L
0xE1
0_ H
0xE2
0 _ SCALE
0xE3
0xE4
0xE5
SCALE
_L
_H
Stored as
2’s complement
2’s complement
unsigned
2’s complement
2’s complement
unsigned
2’s complement
unsigned
unsigned
unsigned
unsigned
unsigned
Parameter
IR pixel individual offset coefficient
Individual Ta dependence (slope) of IR pixels offset
Individual sensitivity coefficient
Compensation pixel individual offset coefficients
Individual Ta dependence (slope)
of the compensation pixel offset
Sensitivity coefficient of the compensation pixel
Thermal gradient coefficient
Scaling coefficient for slope of IR pixels offset
Common sensitivity coefficient of IR pixels
Scaling coefficient for common sensitivity
Scaling coefficient for individual sensitivity
Emissivity
Table 7 EEPROM parameters for To calculations
3001090620
Rev 4.0
Page 17 of 40
Datasheet IR16x4
19 September 2012