LPS22HB post solder correction

[Bill Dempsey]

Hi, I am using the LPS22HB and noticed it was reading significantly off after installation. The datasheet and applications notes really don't address this and a good way to correct for it. Could you look at enhancing your application notes or technical notes for this specific issue and address how the factory calibrates and what a user *should* do to restore accuracy?

Thank you

Bill

[Winfred LU]

Hi Bill,

One point calibration can be applied to remove the residual offsets after soldering.

It is described in AN4833, Measuring pressure data from ST's LPS22HB digital pressure sensor,

section 4 Offset compensation.

After soldering, the measured offset can be stored in the RPDS (18h, 19h) registers and automatically subtracted from the pressure output registers: the output pressure register PRESS_OUT (28h, 29h and 2Ah) is provided as the difference between the measured pressure and the content of the register 256*RPDS (18h, 19h) (DIFF_EN = ‘0’, AUTOZERO =‘0’, AUTORIFP= ‘0’).

Best Regards,

Winfred