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DS90UB953-Q1: Please review the schematic (and some questions)

Chase Jeong
Mastermind 7365 points
Part Number: DS90UB953-Q1

Dear TI experts,

My customer drew their schematic with DS90UB953-Q1. Could you review the schematic?

DS90UB953_231128.pdf

And here are additional questions ;

1. Is it okay to leave floating #20(CLKIN) ?

2. Please check the #19 (CLK_OUT/IDX) is right usage. (I2C address setting)

3. My customer wants to set POC filter for 5V, 410mA average/450mA peak current. Could you also provide POC filter schematic for my customer?

Best regards,

Chase

  • 0
    TI__Mastermind 23555 points

    Hi Chase, 

    Please allow ~1 week for the completed schematic review. 

    Regarding your questions: 

    Chase Jeong said:
    1. Is it okay to leave floating #20(CLKIN) ?

    Yes, CLKIN is recommended to be left floating if unused. 

    Chase Jeong said:
    2. Please check the #19 (CLK_OUT/IDX) is right usage. (I2C address setting)

    CLK_OUT/IDX is configured for 0x30 8 bit I2C address (0x18 7 bit I2C address). This would be the correct configuration for the device. 

    Chase Jeong said:
    3. My customer wants to set POC filter for 5V, 410mA average/450mA peak current. Could you also provide POC filter schematic for my customer?

    I will follow up with the team on what PoC filter solutions may be best suited for the application. 

    Best,

    Zoe

  • 0 in reply to Zoe Bison
    TI__Mastermind 23555 points

    Hi Chase, 

    Please see the attached schematic review: 

    DS90UB953_231128_Reviewed.pdf

    Regarding PoC solutions for a 5v, 410mA rating, PoC solutions from the FPD-Link IV PoC Application Note can be referenced. PoC networks in this Application Note are rate by peak current and temperature. The 5V PoC voltage is typically not recommended due to potential excess noise in the system. For PoC voltage, we typically recommend a voltage of 8V or higher. Higher PoC voltage will reduce the pulse amplitude and give you enough margin for transmission line losses.

    Best,

    Zoe