CCS/TMS320F28379D: Inconsistence in TRM regarding ADC conversion time

Pierre Bouchet1

Expert 2615 points

Part Number: TMS320F28379D

Tool/software: Code Composer Studio

Hello,

Looking at the TRM there are two numbers which contradict each other.

In the ADC chapter, table 10-10 states that the conversion time with a prescale ratio of 4 is 41 SYSCLK cycles.
In the CLA chapter, section 5.5.2.1 states that the time needed by the ADC to complete a conversion is 42 SYSCLK cycles.

So which is it? If I want to read the result of an ADC conversion from the CLA as soon as possible with Early Interrupt mode, do I have to assume n=41 or n=42?

Cheers,

Pierre

over 7 years ago

0 Joseph Casuga over 7 years ago

TI__Mastermind 43670 points

Hi Pierre,

Please follow the timing table in the ADC chapter, in this case n = 41. We'll have the example in the CLA chapter corrected.

Thanks and regards,

Joseph

0 Pierre Bouchet1 over 7 years ago in reply to Joseph Casuga

Expert 2615 points

Hi Joseph,

I can confirm that, based on further tests using the DLYSTAMP register of the ADC Post Processing Blocks, everything happens as though n = 41.

Thanks,

Pierre

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CCS/TMS320F28379D: Inconsistence in TRM regarding ADC conversion time