• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 2 answers
  • Subscribers 32 subscribers
  • Views 103 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

DS90UB936-Q1: VDD Supply related

Chuqiang Wen
Expert 4560 points
Part Number: DS90UB936-Q1

Hi Expert,

We found that there have VDD18_CSI, VDD11_CSI, VDD18_FPD0, VDD11_FPD0 pins on 936. I am confused that which functional block these pins are powered? 

  • For the voltage level of MIPI CSI-2 port, Does it come from VDD18_CSI or VDD11_CSI? 
  • What is the difference between VDD18_FPD0 and VDD11_FPD0? 

Thanks!

Ethan Wen

  • 0
    TI__Genius 14090 points

    Hi Ethan,

    Thank you for your question. The function of these pins is related to the VDD_SEL pin (pin description included below). When VDD_SEL is low an internal 1.1 V supply is used for the internal LDO regulator. When VDD_SEL is high an external 1.1 V supply is used for the internal LDO regulator.

    VDD18_CSI and VDD18_FPD serve as the power supplies and VDD11_CSI and VDD11_FPD serve as the connection for the internal regulator supply. The specific connection that occurs at pins VDD11_CSI and VDD11_FPD depend on the VDD_SEL pin setting.


    Regards,

    Darrah

  • 0 in reply to Darrah Merillat
    TI__Expert 4560 points

    Hi Darrah,

    Thanks for your reply. 

    I can understand the VDD_SEL function. But I would like to understand which functional block powered from these pins? 

    Both VDD18 and VDD11 are required for 936, so for the voltage level of MIPI CSI-2 port signal, does it come from VDD18_CSI or VDD11_CSI(1.8V or 1.1V)?

    The reason I ask is that customer's MCU MIPI CSI port signal is 1.09V~1.2V. 

    Regards,

    Ethan Wen

  • 0 in reply to Chuqiang Wen
    TI__Genius 14090 points

    Hi Ethan,

    VDD11 and VDD18 do not necessarily power an isolated block/port. I think what you are looking for is the expected port output values, which are actually defined in the DC electrical characteristics section of the datasheet. A typical output value is 1.2V. I've included a screenshot for you below, but all other min/max values can be found in section 6.5 of the datasheet.

    Regards,

    Darrah