• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 98 subscribers
  • Views 407 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DM8148 SmartReflex, DVSS support and power supply choice

Bryan Busacco
Expert 1215 points
Other Parts Discussed in Thread: TPS62353

I would like to verify my findings fro the Datasheet of the DM8148.

With respect to the CVDD_HDVICP power: DVSS is supported so the TPS62353 ( I2C for Dynamic Voltage Scaling ) as seen on the Mistral eval board is a solid choice.

If I do not care about DVSS and power savings, can I use any  single output switcher permenantly set to my desird output of 1.28, 1.35, 1.42 V  ?

Are there any pitfalls of not using a scalable power supply, or just sticking the TPS62353 in the design, even though I would likely never scale the voltage?

I also notice that the TPS62353 powers up with a setting of 1.2v, which is not considered a standard setting. Can I run the CVDD_HDVICP at the 1.2v output of the TPS62353? Or do I have to set the output specifically to either 1.28, 1.35, 1.42 V? This would be a pitfall as I mentioned above since the device powers up at 1.2v, I would always have to readjust the setting to one of the three "standard settings."

 

Thanks,

 

Bryan Busacco

  • 0
    TI__Expert 8780 points

    Hi Bryan, 

    You could use a non switchable power supply, some customers have already done that. 

    But you need to be careful w.r.t the overall system performance and power targets of your system and the power up sequence. 

    how did you define the outputs 1.28V, 1.35V and 1.42V? The voltage choice should be based on OPP and part number rating and also the desired frequency of operation. For example if your frequencies are in OPP 100 limits you may choose to use 1.1V as rail voltage.

    Regards,

    Rajat