Question, i.MX28 LRADC bandgap reference calibration

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Question, i.MX28 LRADC bandgap reference calibration

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Aemj
Contributor IV

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

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igorpadykov
NXP TechSupport
NXP TechSupport

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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igorpadykov
NXP TechSupport
NXP TechSupport

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

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

View solution in original post

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Aemj
Contributor IV

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

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Miyamoto

yes this is correct.

Best regards

chip

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