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GLIU.21
GLIU.21
Visitor II
October 22, 2020
Solved

Hi, I want to use STUSB4500 chip to design USB-type-c interface, In the STEVAL-ISC005V1 evaluation board, I am confused about the functions of D14, R1, and R4. Can you help me? Best regard!

  • October 22, 2020
  • 1 reply
  • 1175 views

The attachment is the schematic diagram of the STEVAL-ISC005V1 evaluation board.

    This topic has been closed for replies.
    Best answer by Winfred LU

    They would be the VBUS discharge circuit.

    When VBUS is charging up, D4 switches ON and charges the capacitor in a very short time.

    The fluctuations in VBUS will be filtered by the C4 and R1.

    The voltage is monitored with R4.

    During there is a significant drop in the VBUS (cable disconnection, power down transitions, hard reset and error recovery state), the VBUS discharge path is activated on the VBUS_VS_DISC pin.

    1 reply

    Winfred LU
    Winfred LUBest answer
    ST Employee
    October 27, 2020

    They would be the VBUS discharge circuit.

    When VBUS is charging up, D4 switches ON and charges the capacitor in a very short time.

    The fluctuations in VBUS will be filtered by the C4 and R1.

    The voltage is monitored with R4.

    During there is a significant drop in the VBUS (cable disconnection, power down transitions, hard reset and error recovery state), the VBUS discharge path is activated on the VBUS_VS_DISC pin.

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