Tool/software:
Hi,
My customer has three questions regarding offset voltage calibration:
A. Where are the values of the autocalibration which is carried out during the start-up stored?
B. How can these values be used (which unit do the values have)?
C. What error for gain and offset voltage do I have to consider in my tolerance calculation after calibration?
Best regards
Hi,
The values of the autocalibration are stored within the device logic and cannot be directly accessed. Both SPI and H/W options allow you to perform calibration through the use of the CAL pin. For the SPI option, autocalibration can be performed again by enabling the AUTO_CAL register setting. You can then rerun autocalibration with the CSA_CAL_X register. Figure 35 demonstrates how calibration is executed by shorting the shunt resistor.
Your gain will range from 4.85V/V to 40.8V/V depending on certain conditions. I have included the table for you to reference. The error for offset voltage can range from -4mV to 4mV when your gain is equal to 10, 20, or 40 V/V. It could also range from -5mV to 5mV when the value for gain is 5 V/V.
Best,
Allison F.
