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參數(shù)資料
| 型號： | DK90308 |
| 英文描述： | DK90308 Demo Kit for MLX90308 |
| 中文描述： | DK90308演示套件MLX90308 |
| 文件頁數(shù)： | 16/21頁 |
| 文件大?。?/td> | 391K |
| 代理商： | DK90308 |
GNTC
The GNTC values are the gain temperature compensation values for each of the four temperature
gaps, GNCT1, GNTC2, GNTC3, and GNTC4. These values are used to adjust the signal up or
down based on the relative temperature within a particular gap. Mathematically this is
represented by the following equation:
DAC_GAIN = CSGN * {GN[9:0] + [GNTCi *
Ti]}
Where:
Ti = (T1 – temp_f) for gap 1
Ti = (temp_f – T
i-1
) for gaps 2,3,and 4
Temp_f = Filtered temperature
DAC_GAIN = The digital value that adjusts the gain on the gain amplifier.
Ti = Temperature segment point i = 2, 3, or 4
GNTCi = Gain TC for a given temperature segment i,
CSGN = Course Gain.
GN[9:0] = Fixed Gain (doesn’t change with temperature)
The GNTC and OFTC values are 12 bit
fixed point signed numbers, see figure
10. That means that the most significant
bit is a sign bit. The next bit is one or
zero (whole number). The remaining 10
bits are to the right of the decimal point.
This gives the variable the range of –
1.9990234 to +1.9990234. The table
below shows how the fixed point
numbers are represented as the binary
number progresses from 0 to 4095.
Figure 10, 12 Bit fixed point numbers
Decimal
Value
Equivalent
Hexadecimal
Real Number
Equivalent
0
0000h
+0.00
1023
3FFh
+0.9990234
1024
400h
+1.000
2047
7FFh
+1.9990234
2048
800h
-0.000
3071
0BFFh
-0.9990234
3072
0C00h
-1.000
4095
0FFFh
-1.9990234
MLX90308CCC & MLX90314AB Software Users Manual
Rev 2.0
16
11/28/01
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