MPC5777c sdadc offset and gain calibration

[tapur]

Hi there,

I am working on MPC5777C and I am working with sigma delta ADC. I have read reference manual for a couple of times by now, but I can't find how to check if SDADC works properly after I conduct SDADC offset and SDADC gain calibrations. Also, I have used sdadc_swtrigger_mpc5777c code from example for offset and gain calibrations to calibrate SDADC.

So, is there a way to check if SDADC works properly?

Thanks in advance for all of your helps,

Best regards.

[tapur]

Hello, If I explain in detail: After making SDADC offset and gain calibrations, I want to softwarely check whether the SDADC is calibrating correctly. To give an example, another part of the code uses EQADC. After calibrating in EQADC according to the reference manual, this is how I understand whether the calibration was done correctly. VREF75 and VREF25 is measured by using EQADC. Calibration is correct if the difference between the measured value and the ideal value is less than or equal to the TUE value (8).

Likewise, after making the offset and gain calibrations in SDADC, how do I know if the calibrations are done correctly?

Thanks,

[petervlna]

Hello,

You can basically measure GND, VDD and then measure some voltage to verify it is correct.

Best regards,
Peter