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参数资料
| 型号： | PGA309EVM |
| 厂商： | Texas Instruments, Inc. |
| 英文描述： | PGA309 Evaluation Module(PGA309评估模块) |
| 中文描述： | PGA309评估模块（PGA309评估模块） |
| 文件页数： | 45/53页 |
| 文件大小： | 4221K |
| 代理商： | PGA309EVM |
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5) Repeat Step 4 for measuring the max-scale (C27) and (if needed) mid-scale (C26) Vout values.
6) Place the Sensor + PGA309 at the temperature Tmeas2 and repeat the Steps 3, 4, 5 entering the values to
the corresponding cells below the ones shown in Figure 40. At each stage make sure the signal path of the
PGA309 is not overloaded by reading the state of the Alarm Register.
7) If using the “2 Temperature + 3 Pressures” or “2 Temperature + 2 Pressures” algorithms, enter the second
order parameter non-linearities of the sensor in the highlighted cells B33:B36.
8) Verify that the resulting fitted sensor approximation (Figure 34) are in agreement with the characterization
data.
9) Go to the next Worksheet, “Calibration Results”, and enter the desired output voltage scale in the cells B4,
B5, the number of the Lookup Table points in the cell E4 and the temperature range where the calibrated
output signal is expected in cells E6, E7 (see Figure 41). Note that this can be a narrower range than the
Tmin-Tmax range used for the sensor curve-fitting. Using a smaller temp range will reduce the spacing
between the points on the piece-wise linear (PWL) gain and offset curves generated by PGA309. This in
turn, will reduce the residual 3
rd
order errors of the output. The resulting lookup table and the simulated plot
at the bottom of the page get instantly updated. The plot axes might have to be adjusted to display the
curves properly. Pay attention to the “Result Sanity Check” messages in the cells B11:B13. If the required
DAC or ADC values are outside of the linear ranges of the PGA309 the message will inform you about it.
This means that the coarse parameters of the PGA309 must be adjusted and the calibration has to be
repeated.
PGA309 Desired output and its look-up table
Lookup Table Parameters:
Enter Output Scale:
# of points:
Vout_max=
4.5 V
Ntemp=
17
Vout_min=
0.5 V
Optional:
LUT_Tmin=
-50 degC
LUT_Tmax=
150 degC
Page 45 of 53
Resulting Look-up Table
Point#
Temp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Look-up table Hex
Gfine,V/V GainSlope Vzero, V
0.703735
0.706215
0.000198
0.709357
0.000251
0.713177
0.000306
0.717697
0.000362
0.722944
0.00042
0.728947
0.00048
0.735743
0.000544
0.743374
0.00061
0.751888
0.000681
0.76134
0.000756
0.771795
0.000836
0.783326
0.000922
0.796016
0.001015
0.809964
0.001116
0.82528
0.001225
0.842093
0.001345
0.842093
ZeroSlope
Temp
ZM
11E9
002F
0026
001B
0011
0006
FFFD
FFF2
FFE8
FFDE
FFD3
FFC9
FFBF
FFB4
FFAA
FFA0
FF95
0000
-50
0.286542
0.29596
0.303348
0.308706
0.312034
0.313332
0.3126 -5.85E-05
0B02
0.309839 -0.000221
0E2C
0.305048 -0.000383
1156
0.298227 -0.000546
1480
0.289376 -0.000708
17A9
0.278495
-0.00087
1AD3
0.265584 -0.001033
1DFD
0.250644 -0.001195
2126
0.233674 -0.001358
2450
0.214673
-0.00152
277A
0.193643 -0.001682
2AA3
0.193643
F808
-37.5
-25
-12.5
0.000753
FB32
0.000591
FE5C
0.000429
0185
0.000266
04AF
0.000104
07D9
0
12.5
25
37.5
50
62.5
75
87.5
100
112.5
125
137.5
150
150
Result Sanity Check:
ZeroDAC is OK: values are in Range.
GainDAC is OK: values are in Range.
TempADC is OK: values are ascending and in Range.
0
0
7FFF
Vout max and min calibrated
Figure 41: Calibration Results Worksheet
10) Return to the “Main” Worksheet and click on the “Save Register+Lookup Table” button to save the
calibration results in a file. Now load this file to the PGA309 EEPROM using Board Control Program by
using the “Open File” button, and then the “Write EEPROM” button.
11) Verify that the output of the PGA309 is satisfactory.
12) Optional: To account for the Lin DAC, offset, and gain errors of the PGA309 ZeroDAC and GainDAC, two
additional measurements might need to be performed after Step 11. This should improve the calibrated
output precision. For example, a sensor with span and offset drift errors on the order of 15% of span will
have a post calibration error of less then 0.3%. After the secondary calibration, the error is typically less
then 0.1%. See Figure 42.
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