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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.
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 PU29 ENN_CC 0.37 V OPEN30 VDD5 0.41 V OPEN
Could you give me your comments which pins leak the voltage to VDD5 pin?
Does VDD3 off too? can they send schematic to us?
Yes, Both of VDD5 and VCC are off. Also, CC pin shows 5.1kohm. So, the device entered the dead battery mode.
yes
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 OPEN4 PORT 0.00 V GND 4.7k PD5 VBUS_DET 0.48 V VBUS 888k PU8 VCC33 0.02 V OPEN11 DIR 0.00 V VCC33 220k PU12 ENN_MUX 0.03 V OPEN22 ADDR Not measured OPEN23 INT_N/OUT3 Not measured OPEN24 VCONN_FAULT_N 0.01 V OPEN25 SDA/OUT1 0.01 V OPEN26 SCL/OUT2 0.01 V OPEN27 ID 0.01 V OPEN29 ENN_CC 0.37 V OPEN30 VDD5 0.41 V OPEN
did they connect VDD5 and VBUS det to Vbus? can we see their schematic?
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.
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.