TMS320F28P659DK-Q1: TMS320F28P65 Sleep mode current implementation power supply stratergies

monica bagade

Prodigy 140 points

Part Number: TMS320F28P659DK-Q1

Tool/software:

I am using TMS320F28P659 100 pin MCU for my application.

I have connected same 3.3V out to VDDIO, VDDA, VREFHIA, VREFHIB, VREFHIC - filtering provided to each input

1.2V VDD is connected to external 1.2V (provision is there to use internal regulator as well as external regulator)

TPS62901QRYTRQ1 for converting 12V to 3.3V

TPS78501BQWDRBRQ1 for 3.3v to 1.2V

I want to understand sleep mode implementation strategy in Hardware.

1. Do I need to turn on both 3.3V and 1.2V supply full time even in sleep mode?

2. Major current taking is 1.2V core supply. In unprogrammed mode (New MCU which is not flashed at all), it is consuming 23mA from 3.3V when 1.2V is enable. However it takes very less 2 mA from 3.3V when 1.2V is disabled.

Thanks,

Monica

7 months ago

0 monica bagade 7 months ago

Prodigy 140 points

Hi Team, Waiting for reply

0 Fleenor 6 months ago

TI__Mastermind 23663 points

Hi Monica,

Apologies for the delayed response here as the original expert has been unavailable. Please allow me some time to review your query and provide a response by 5/9/2025.

Can you provide a diagram of the current power tree and associated current draws for each rail?

Thank you for your continued patience.

Best Regards,

Zackary Fleenor

0 Fleenor 6 months ago in reply to Fleenor

TI__Mastermind 23663 points

Hey Monica,

Wanted to apologize again for the delayed response to your original post. Is this issue still open?

What is meant by "Sleep Mode" here?

The 1.2V VDD rail draws more current then the 3.3V VDDIO rail as described in the datasheet.

Best Regards,

Zackary Fleenor

C2000™︎ microcontrollers

C2000 microcontrollers forum

TMS320F28P659DK-Q1: TMS320F28P65 Sleep mode current implementation power supply stratergies