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Original question:

DS90UB954-Q1: camera flick issue

DS90UB954-Q1: current larger from 2Ghz to 4Ghz

peiyq
Expert 1400 points
Part Number: DS90UB954-Q1

Hi  TI，

    Could you tell me why  current is larger than  20mA  when we  change POC  from 2Ghz to 4Ghz? i can't understand this.

Thanks

Peiyuanqing

  • 0
    TI__Expert 3390 points
    Hi Peiyuanqing,

    Just wanted to clarify, you changed the PoC network? From the 2GHz Configuration to a 4GHz Configuration? Also, what is the current draw for each voltage rail between the two configurations?

    Regards,
    Mandeep Singh
  • 0 in reply to Mandeep S
    Expert 1400 points
    Hi Mandeep，
    We change PoC network from the 2GHz configuration to a 4GHz configuration since we use DS90UB953 for 2M camera application ,the total current will increase about 40mA.and we find if we set 954 register 0x58[2:0]. Set bit [2:0] to 101,the current will lower .could you check if we cat set bit [2:0] to 101?
    thanks
    peiyuanqing
  • 0 in reply to peiyq
    TI__Expert 3390 points
    Hi Peiyuanqing,

    An increase in current is expected when going from 2G to 4G speeds. See the DC specs in the datasheet and you'll notice that there's typically a 20mA increase between rates.

    Regards,
    Mandeep Singh
  • 0 in reply to Mandeep S
    Expert 1400 points
    Hi Mandeep，
    Could you double confirm 20mA current is expected only by 2G to 4G of PoC network and keep 0x58 Set bit [2:0] to 110
    thanks
    peiyuanqing
  • 0 in reply to peiyq
    TI__Expert 3390 points
    Hi Peiyuanqing,

    Okay, are you stating that you only change the poc network? No change to the datarate? If the Forward Channel rate remains the same, then their should be no current change. What's stated in the datasheet is correct if you are changing datarates between 2G and 4G. It should not be changing if all you do is change the components for a different PoC configuration because the part is still the consuming the same current.

    Regards,
    Mandeep Singh