TMS320F28027: TMS320F28027 replace the TMS320F28023 , Does that matter the ADC value and the ePWM value?

wenwen zhang

Part Number: TMS320F28027
Other Parts Discussed in Thread: TMS320F28023

I used TMS320F28027 to replace the TMS320F28023, they have different operating frequency . Does that matter the ADC value and the ePWM value?

over 6 years ago

0 Sudhakar Singh47 over 6 years ago

TI__Intellectual 860 points

Hello,

Concerned experts have been notified.
Please note that the response might be delayed due to holidays.

Regards,
Sudhakar

0 Cody Watkins over 6 years ago

TI__Mastermind 42195 points

Wenwen,

(I am not the ADC expert) The speed of the ADC will certainly change. 4.6 MIPS on F28027 will be reduced to 3 MIPS on F28023. I don't know of any frequency related issues with the performance of our ADC(I expect you will have a very similar ENOB), but I will let an expert comment.

The ePWM is clocked off of SYSCLK, so it will be affected by this change. The ePWM will lose a small amount of resolution due to the reduced frequency(20nS per step instead of 16.66nS per step). Thus you will need to recalculate your period, duty, and dead-band. If you are using the PWM chopper, your chopping frequency will change slightly as well.

Hope it helps,
Cody

0 tlee over 6 years ago in reply to Cody Watkins

TI__Guru 62975 points

Wenwen,

The ADC performance will be similar. Be sure to check the ADC advisories in the Errata document as well.

-Tommy

0 wenwen zhang over 6 years ago in reply to Cody Watkins

Prodigy 60 points

Thanks, you have been a big help!

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28027: TMS320F28027 replace the TMS320F28023 , Does that matter the ADC value and the ePWM value?