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HD3SS3220: Voltage leakage to VDD_5V in the condition of IC power off

Expert 4155 points

Replies: 16

Views: 135

Part Number: HD3SS3220

Hi team,

When my customer connected HD3SS3220 to PC with USB C - A cable in the condition of IC's power off, they found that there is 0.1V of voltage leakage to VDD_5V. As the datasheet described, they supplied VBUS and VDD_5V separately. So, customer think the voltage is leaked from CC pin. Is there any point that might leak the voltage to VDD_5V?

Regards,

Saito

  • when VDD_5v is off, are there any pin still has voltage? this will back drive the device.

  • In reply to Brian Zhou:

    Hi Brian-san,

    I asked customer to check the voltage of other pins.

    I will get back to you once I get information from customer.

    Regards,

    Saito

  • In reply to Takahiro Saito:

    Hi Brian,

    Customer saw some voltages on following pins.

    No. pin     Name                        voltage                  Circuit connection

    1              CC2                           0.15 V                   USB Type-C Con.
    2              CC1                           0.96 V                   USB Type-C Con.
    5              VBUS_DET                0.48 V                  VBUS 888k PU
    29            ENN_CC                    0.37 V                  OPEN
    30            VDD5                          0.41 V                 OPEN

    Could you give me your comments which pins leak the voltage to VDD5 pin?

    Regards,

    Saito

  • In reply to Takahiro Saito:

    Does VDD3 off too? can they send schematic to us?

  • In reply to Brian Zhou:

    Hi Brian-san,

    Yes, Both of VDD5 and VCC are off. Also, CC pin shows 5.1kohm. So, the device entered the dead battery mode.

    Regards,

    Saito

  • In reply to Takahiro Saito:

    yes

  • In reply to Brian Zhou:

    Hi Brian-san,

    Could you give me your comment where the voltage leaks to the VDD5 pin?

    The below is the pin voltage and the connection for HD3SS3220.

    It looks CC1 and VBUS_DET has relatively higher voltage than other pins.

    Do you think these pins are leakage source to the VDD5 pin?

    No.   pin Name                voltage              circuit connection

    1     CC2                          0.15 V               USB Type-C Con.
    2     CC1                          0.96 V               USB Type-C Con.
    3     CURRENT_MODE   0.01 V               OPEN
    4     PORT                        0.00 V              GND 4.7k PD
    5     VBUS_DET               0.48 V              VBUS 888k PU
    8     VCC33                       0.02 V              OPEN
    11   DIR                            0.00 V               VCC33 220k PU
    12   ENN_MUX                 0.03 V              OPEN
    22   ADDR                        Not measured  OPEN
    23   INT_N/OUT3             Not measured  OPEN
    24   VCONN_FAULT_N   0.01 V               OPEN
    25   SDA/OUT1                0.01 V               OPEN
    26   SCL/OUT2                 0.01 V              OPEN
    27   ID                              0.01 V               OPEN
    29   ENN_CC                   0.37 V               OPEN
    30   VDD5                        0.41 V               OPEN

    Regards,

    Saito

  • In reply to Takahiro Saito:

    did they connect VDD5 and VBUS det to Vbus? can we see their schematic?

  • In reply to Brian Zhou:

    Hi Brian-san,

    VDD5 is not connected to VBUS. But, VBUS_det is connected to VBUS with 888kohm resistor.

    I will ask customer to provide the schematic to us. But, I appriciate if you could use the circuit connection I showed in last thread instead of schematic.

    Regards,

    Saito

  • In reply to Takahiro Saito:

    Hi Brian-san,

    I have an additional inforimation on this. It depends on the USB-C plug orientation whether the leakage voltage on VDD5 happens or not.

    If the cable orientation which CC1 has a voltage, the leakage voltage is showed up on VDD5. But, if the other orientation, there is no leakage on VDD5.

    Regards,

    Saito 

      

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