TMS320F280039: How does the internal blocking circuit isolates work?

Zane Wei

Intellectual 1925 points

Part Number: TMS320F280039

Hi Team,

How does the internal blocking circuit isolates work?

Best Regards,

Zane

over 2 years ago

0 Allison Nguyen over 2 years ago

TI__Mastermind 26600 points

Hi Zane,

Please allow for another day for me to look into this and get back to you. Appreciate the patience!

Best Regards,

Allison

0 Allison Nguyen over 2 years ago

TI__Mastermind 26600 points

Hi Zane,

A few folks are OOO at the moment for the long weekend, so I will have to update you early next week.

In the meantime, can I ask about the context of why you are needing this information?

Best Regards,

Allison

0 Zane Wei over 2 years ago in reply to Allison Nguyen

TI__Intellectual 1925 points

Hi Allison,

Thanks for your help! A customer who use CMPSS1, CMPSS3 and CMPSS4.They found when let VDAC/B3 floating, the CMPSS3 will work not normally. But when VDAC/B3 ground, the CMPSS work normally. They use A3 as the input of CMPSS3. Now, we guess that because some pin on CMPSS3 MUX over voltage when VDAC/B3 floating. We need more information to confirm that.

Best Regards,

Zane

0 Allison Nguyen over 2 years ago in reply to Zane Wei

TI__Mastermind 26600 points

Hi Zane,

Thanks for the info. Just FYI I'm still waiting to hear back but will update as soon as I do!

Best Regards,

Allison

0 Allison Nguyen over 2 years ago in reply to Zane Wei

TI__Mastermind 26600 points

Hi Zane,

Thanks for the patience. The feedback from design is that the blocking circuit detects if the pad or supply is at its highest potential and if the pad is at its highest potential (by 0.3V) then the input mux is turned off, cutting off the input to the CMPSS. Let me know if anything else is needed.

Best Regards,

Allison

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F280039: How does the internal blocking circuit isolates work?