Question, i.MX28 LRADC bandgap reference calibration

[Aemj]

Hi team,

I would like to ask about the bandgap reference voltage calibration.

i.MX28 reference manual(MCIMX28RM Rev.2) says as below.(Table 38-1)

"But if the bandgap reference is calibrated using the fuses, then …"

Could you show me what the 'calibration with fuses' is?

And could you show me the procedure of the calibrate with fuses?

Thanks,

Miyamoto

[igorpadykov · Accepted solution]

Hi AVNET JAPAN FAE

ADC 'calibration with fuses' is not supported

(not tested/no example codes).

Also bandgap voltage doesn't output to pad and

can't be monitored on pad, so it is difficult to calibrate bandgap voltage for i.MX28.

Best regards

chip

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[Aemj]

Hi Chipexpert,

Can I understand as below?

The internal bandgap reference voltage is connected to LRADC channel-14 internally, but user cannot monitor it.

Then the bandgap reference voltage cannot be calibrated.

BR,

Miyamoto

[igorpadykov]

Hi Miyamoto

yes this is correct.

Best regards

chip