Evaluation Kit
Manual
Contents
1 Quickstart ..................................................................................................................................4
2 Introduction ...............................................................................................................................6
2.1 Sensor Types ................................................................................................................................. 6
2.1.1 Uncompensated - constant voltage operation ..................................................................... 6
2.1.2 Uncompensated - constant current operation ..................................................................... 7
2.1.3 Signal-conditioned - Digital/I2C ............................................................................................ 7
2.1.4 Signal-conditioned - Amplified analog .................................................................................. 7
3 Calibration .................................................................................................................................7
3.1 Why do we need a calibration? .................................................................................................... 7
3.2 Theory of Calibration .................................................................................................................. 10
3.2.1 Compensation approaches for uncompensated pressure sensors .................................... 10
3.2.2 Constant voltage mode ....................................................................................................... 11
3.2.3 Constant current mode ....................................................................................................... 16
4 Using the Evaluation Kit ............................................................................................................ 19
4.1 Setup ........................................................................................................................................... 19
4.1.1 Range setup of compensated sensors ................................................................................ 22
4.2 Measurement pages ................................................................................................................... 23
4.3 How to do a calibration ............................................................................................................... 25
4.3.1 Constant voltage calibration ............................................................................................... 26
4.3.2 Constant current calibration ............................................................................................... 29
4.4 Troubleshooting .......................................................................................................................... 30
5 Evaluation Kit Hardware ........................................................................................................... 31
5.1 Hardware Design Explained ........................................................................................................ 31
5.2 Circuitry ....................................................................................................................................... 32
5.2.1 Amplification Circuit ............................................................................................................ 32
5.2.2 Optional Level Shift ............................................................................................................. 33
5.2.3 Power Supply ...................................................................................................................... 34
5.2.4 Temperature Measurement ............................................................................................... 34
5.3 Uncompensated constant current sensor board ........................................................................ 35
6 Expected Performance .............................................................................................................. 36
7 Appendix .................................................................................................................................. 39