How to do OPC of LPS22HB or LPS22HD?

[just4you]

Posted on June 15, 2018 at 11:36

I'm trying to find the opc procedures of LPS22HB or LPS22HD.

The datasheet only states you would refer to the pressure offset register.

There're no detailed information about opc procedures.

Where can I found that?

These are the list of I'd checked.

- en.DM00170606.pdf

  AN4672 Application note

  : LPS22HB/LPS25HB digital pressure sensors: hardware guidelines for system integration

- en.DM00242308.pdf

  TN1229 Technical note

  : How to interpret pressure and temperature readings in the LPS22HB pressure sensor

- en.DM00269729.pdf

  AN4833 Application note

  : Measuring pressure data from ST's LPS22HB digital pressure sensor

- en.DM00140895.pdf

  LPS22HB

  : MEMS nano pressure sensor: 260-1260 hPa absolute digital output barometer

- Unicleo-GUI & X-NUCLEO-IKS01A2

I want to check my application's accuracy of LPS22HB after opc.

#calibration #lps22hb #opc #one-point-calibration

[Miroslav BATEK]

Posted on June 18, 2018 at 16:47

I'm not aware about any specification for OPC.

But you can simply do it by measuring the pressure with some high accuracy pressure gauge and put the difference between more precise sensor and LPS22HB into RPDS_L and RPDS_H registers.

[just4you]

Posted on June 19, 2018 at 12:20

Your comment means the reference value is just bias for the pressure sensor data.

Then, how can you explain the increment of accuracy in the datasheet?

I think 10 times the accuracy increment is a pretty dramatic change.

so, I want to test my system's accuracy increment after OPC shown in the datasheet.

[Miroslav BATEK]

Posted on June 19, 2018 at 14:27

The soldering process can create a residual offset which can be compensated by the OPC. The soldering don't have effect on linearity. I don't see an issue in the increasing absolute accuracy after offset compensation.