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PDF ( 数据手册 , 数据表 ) KP126N6165

零件编号 KP126N6165
描述 Absolute Pressure Sensor
制造商 Infineon
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KP126N6165 数据手册, 描述, 功能
November 2007
Absolute Pressure Sensor
KP126N6165
Data Sheet
Rev 1.02
Sense & Control







KP126N6165 pdf, 数据表
Absolute Pressure Sensor
KP126N6165
Functional Description
4 Functional Description
4.1 Sensor
Pressure is detected in a capacitive way by an array of surface micromachined sensor cells.
The sensor cell output is amplified, temperature compensated and linearized to obtain an output voltage that is
proportional to the applied pressure.
The transfer function for linearization is calculated in the digital part of the sensor using third order polynomial
calculation.
The transfer function is given by the following parameters:
• Minimum and maximum rated pressure
• Voltage at minimum rated pressure
• Voltage at maximum rated pressure
• Sensitivity
The output is analog and ratiometric with respect to the supply voltage.
All parameters needed for the complete calibration algorithm — such as offset, gain, temperature coefficients of
offset and gain, and linearization parameters — are determined after assembly. The parameters are stored in
internal registers in the EEPROM of the chip.
On Board Diagnostics
When the chip is not powered properly, the JFET transistors of the On Board Diagnostics (OBD) stage are self-
conducting. For example, if the GND connection is interrupted, the output is drawn strongly to VDD. The
microcontroller can set a limit for valid output signals. In the case of an error, the output voltages will be too close
to the VDD or GND potential.
Data Sheet
8 Rev 1.02, 2007-11-23







KP126N6165 equivalent, schematic
Absolute Pressure Sensor
KP126N6165
Accuracy
6.2 Overall Accuracy
Overall accuracy covers the entire pressure and temperature range from all sources of error including the
following:
Pressure:
Output deviation from target transfer function over the specified pressure range.
Temperature:
Output deviation over the temperature range.
Aging
All drifting parameters during operating time.
Note: Ratiometric signal error is not included in the overall accuracy. For error measurements, the supply voltage
must have the nominal value (VDD = VDD,TYP).
The error band is determined by three continuous lines through four relevant break points:
Table 7 Accuracy
Temperature Point (°C)
– 40
0
85
125
Error (kPa)
± 2.0
± 1.0
± 1.0
± 2.0
Error Multiplier
2
1
1
2
2.5
2.0
1.5
1.0
0.5
0.0
-40
0
Figure 9 Overall Error Over Temperature
T (°C)
85
125
Data Sheet
16 Rev 1.02, 2007-11-23










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