參數(shù)資料
型號: DK90314
英文描述: DK90314 Demo Kit for MLX90314
中文描述: DK90314演示套件MLX90314
文件頁數(shù): 17/21頁
文件大小: 391K
代理商: DK90314
OFTC
The OFTC values are the offset temperature compensation values for each of the four
temperature gaps, OFCT1, OFTC2, OFTC3, and OFTC4. These values are used to adjust the
signal’s offset up or down based on the relative temperature within a particular gap. The offset
adjustment is additive from one gap to the next. That is the offset adjustment for the fourth gap
is added to the total offset adjustment of the third gap which is also added to the total offset
adjustment of the second gap. Mathematically this is represented by the following equation:
For the first temperature gap:
DAC_OFFSET = OF[9:0] + OFTCi * (T1 – Temp_f).
For the second temperature gap:
DAC_OFFSET =OF[9:0] + OFTC2 * (Temp_f – T2)
For the third temperature gap:
DAC_OFFSET = OF[9:0] + [OFTC2 * (T2-T1)] + OFTC3 * (Temp_f – T3)
For the fourth temperature gap:
DAC_OFFSET =OF[9:0] + [OFTC2 * (T2-T1)] + [OFTC3 * (T3 – T2)] +
OFTC4 * (Temp_f – T4)
OF[9:0] = Fixed offset
3.6) Signal Linearization
The MLX90308’s signal linearization algorithm is piece-wise with up to 5 signal segments, see
figure 11. Within each signal segment (‘gap’), the correction is first order. There are separate
correction coefficients for each gap.
There are up to five signal gaps possible with the sensor interface. The gaps are defined with
respect to the signal’s digitized value, displayed in the ‘Signal Value in’ box and 'Signal value
out'-box.
MLX90308CCC & MLX90314AB Software Users Manual
Rev 2.0
17
11/28/01
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