TMS320F28065: ADC offset Self-Recalibration

Hitoshi Sugawara

Mastermind 20460 points

Hi Experts,

According to the errata about ADC: Offset Self-Recalibration Requirement in To ensure that the offset remains within the data sheet's “singlerecalibration” specifications, perform the AdcOffsetSelfCal() function after Device_cal() has completed and the ADC has been configured.

Does the offset error change largely during the CPU operation?
if not, is it OK to call AdcOffsetSelfCal() one time just after the CPU wakes up?
Or does it have to be called regularly due to the offset error change during the CPU operation?
If so, how often it must be called?

Thank you very much for your kind support.

Best regards,
HItoshi

over 6 years ago

0 tlee over 6 years ago

TI__Guru 62975 points

Hitoshi-san,

After the initial in-system offset calibration, the offset error is expected to drift with temperature. The recurring calibration can be infrequent -- say once every few seconds in an environment with frequent temperature changes, or once every few minutes in a stable environment.

-Tommy

0 Hitoshi Sugawara over 6 years ago in reply to tlee

TI__Mastermind 20460 points

Hi Tommy,
Understood.
It is depending upon the environment.
Will take care of it.
Thank you for your kind explanation.
Best regards,
Hitoshi

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28065: ADC offset Self-Recalibration