• State Resolved
  • Locked Locked
  • Replies 7 replies
  • Answers 1 answer
  • Subscribers 31 subscribers
  • Views 254 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.

IWRL6432AOP: Schematic Verification

Teja Chintalapati
Prodigy 20 points
Part Number: IWRL6432AOP

Tool/software:

Dear TI Team,

I am working on a design for Presence Detection using IWRL6432AOP, and have designed this schematic by:

  • Reference Schematic from: /radar_toolbox_2_20_00_05/docs/reference_designs/IWRL6432AOP_Reference_Design/IWRL6432AOP Reference design files/IWRL6432AOP Reference design files/TI DEVA(001_IWR)_Sch.PDF
  • Hardware design checklist (for the most part).
    • This is BOM Optimised design with 3V3 and 1V8 Rails

Questions:

  1. Can you please help review the schematic and give feedback?
  2. Can I use LMK6CE04000CDLFR instead of the crystal (XRCGE40M000FBAABR0)?

Appreciate the help, in advance.

  • 0
    TI__Intellectual 2125 points

    Hi,

    Thanks for sharing detailed points as well as the schematic. Please allow us a week to get back to you with the feedback on your schematic.

    Thanks

    Swarnendu

  • 0 in reply to Swarnendu Chattopadhyay
    Prodigy 20 points

    Thank you, Swarnendu.

    I look forward to seeing early feedback, if possible.

    tC

  • +1 in reply to Teja Chintalapati
    TI__Intellectual 2125 points

    Hi Teja,

    I have reviewed the schematic. please find below my feedback:

    Schematic Review Feedback

    Follow up question:

    Why DCDC regulator is used for 3.3V supply instead of LDO?

    Thanks,

    Swarnendu

  • 0
    TI__Intellectual 2125 points

    Teja,

    Regarding your question: Can I use LMK6CE04000CDLFR instead of the crystal (XRCGE40M000FBAABR0),

    I would like to ask if you could please tell why do you want to use an oscillator instead of XTAL?

    Regarding LMK6CE04000CDLFR please see my comments below.

    LMK6CE04000CDLFR phase noise specs are inferior even with high frequency (156.25MHz) output compared to the mmWave device requirements.

    LMK6CE04000CDLFR Phase noise spec:

    IWRL6432AOP Phase noise spec:

    Hence, I do not recommend using this oscillator for the mmWave device. Instead, the crystal that has been used can be kept. Please share if you have any other concerns.

    Thanks,

    Swarnendu

  • 0 in reply to Swarnendu Chattopadhyay
    Prodigy 20 points

    Thank you, Swarnendu.

    1. I've updated Schematic and attaching the same with this email. Can you please have a quick check for me?
    2. The reasons to consider using Oscillator were:
      1. Availability
      2. Ease of compliance

    Given other Oscillators are pricier than 6C Series, I shall be sticking with XTAL for this design.

    Can you please help with a quick review for me, please?

  • +1 in reply to Teja Chintalapati
    TI__Intellectual 2125 points

    Hi Teja,

    I have looked at the updated schematic and it looks okay.

    I have below suggestions, you may consider.

    If overall system power consumption needs to be optimized in device's deep sleep conditions where typically light load conditions are followed, auto mode of switching can be enabled in the TPS6285020M DCDC regulator. In this mode, depending on light load conditions PFM mode of switching is enabled to reduce power consumption of the DC regulator. Auto mode and forced PWM mode of switching can be altered using the MODE pin of the DC regulator. The MODE pin of the DC-DC regulator can be controlled by the mmWave device through a GPIO in a way that the DCDC regulator switches between auto mode and forced PWM mode depending on the device's deep sleep entry and exit. To enable this feature please refer to Enabling PFM Mode For DCDC Converter.

    If you like to use this feature or if you plan to use the auto mode of switching, I recommend using a weaker pull up (100K) for the MODE/SYNC pin of the DCDC regulator (TPS6285020M).

    If this resolves your query, please help me closing this thread.

    Thanks and regards

    Swarnendu

  • 0 in reply to Swarnendu Chattopadhyay
    Prodigy 20 points

    Thanks a ton, Swarnendu. Appreciate your detailed help, very much.

    tC