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GLIU.21
GLIU.21
Visitor II
Oct 22, 2020 11:28 AM UTC
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!

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

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    Winfred LU
    Winfred LUBest answer
    ST Employee
    Oct 27, 2020 6:13 AM UTC

    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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    1 reply

    Winfred LU
    Winfred LUBest answer
    ST Employee
    Oct 27, 2020 6:13 AM UTC

    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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