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TUSB4041I: Some questions

Miranda Gu
Genius 14827 points
Part Number: TUSB4041I

Hi team,

My customer have several questions about TUSB4041I. Need your kind answers, thank you very much.

  1. Is there any requirement for Test-pin pull-down resistance value and its accuracy?

  2. In customer's application, TUSB4041I is used for internal USB extension, not for external USB, so customer don't use USB charging function. Can they just float PWRCTL pin? And also float OVERCUR pin?

3.  What's the EEPROM used for? If customer don't add EEPROM, what's the impacts, do they have to add?

4. Is it OK to set FULLPWRMGMTz/SMBA1 = 1, GANGED/SMBA2/HS_UP = 1 in customer's application?

5. Could you please explain the Automatic mode? If customer disable this mode, what's the impacts, will it affect the device normal operation?

 

Thank you!

  • 0
    TI__Guru 60865 points

    Hi Miranda,

    1. Test pin pulldown should be 4.7K or smaller

    2. OVERCURz and PWRCTLx have internal pu / pd resistors so they can be floated if not used.  Please be aware if the customer wants to get a logo on their USB product the USB IF requires overcurrent reporting on exposed USB ports.  Functionally, it is not required.

    3.  EEPROM is not required.  Optional for extra configuration options.

    4. Yes, those settings are correct for this application. Technically the system is not ganged, but it doesn't apply if FULLPWRMGMTz is set to 1.

    5. AUTOEN only impacts the battery charging modes, since the customer is not using the power switch controls they do not apply here.

    Regards,

    JMMN

  • 0 in reply to JMMN
    TI__Genius 14827 points

    Hi JMMN,

    Many thanks for your prompt reply!

    Additional question, about 1st question, can customer use 5% accuracy resistor for test-pin? Or have to be 1% accuracy?

  • 0 in reply to Miranda Gu
    TI__Guru 60865 points

    The 1% accuracy resistors are only recommended for the USB_VBUS divider network and the USB_R1 pulldown, the rest can be 5%.

    Regards,

    JMMN