TMS320F28069: Capacitance for Vref

Intellectual 2550 points

Part Number: TMS320F28069

What is the recommended capacitance on Vref HI and Vref Lo when we are using internal reference

Regards,

over 4 years ago

0 Brett Larimore over 4 years ago

TI__Guru 57255 points

Hi Ramon,

Please see the following thread, which should help:
https://e2e.ti.com/support/microcontrollers/c2000/f/171/t/862652

Thank you,
Brett

0 RJ over 4 years ago in reply to Brett Larimore

TI__Intellectual 2550 points

Hey Brett,

Diagram on design is as below. What adverse conditions does the design face? Is the 1k to ground the only recommended way?

0 Brett Larimore over 4 years ago in reply to RJ

TI__Guru 57255 points

Hi Ramon,

Since this is not an expected use case, we have not done testing under this condition & cannot give very firm advice.

We suspect this type of connection will not create major problems, just perhaps giving a possibility to add a little bit of extra noise to the system.

As the previously linked thread suggests, we would recommend customer connect VREFHI to either VDDA or VSSA.

Hopefully this helps!

Thank you,
Brett

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TMS320F28069: Capacitance for Vref