STUSB1600 can't work as source

[Gerald_W]

Dear All,

Hello everyone, I used STUSB1600 as the type-c dual role type power management. When it works as sink type, it is good. But when it works as source type, it doesn't work. I found VBUS_EN_SRC always keep high. This is my design schematic, could you please provide some suggestions. Thank you so much!

Best wishes,

Gerald.

[Richard Li]

Is CCxDB pin1,5 cause problem?

If you don't need dead battery function, you may connect these pins to GND.

[Gerald_W]

Hi Richard,

Thanks for your replying. My system is powered by a 3.7v Li battery. I think I need to use the dead battery function. I am also considering VSYS cause the problem. Maybe I should connect VSYS to 5V or VBAT, not GND (in the schematic I am testing, I connected VSYS to GND, sorry for the confusion).

Best regards,

Gerald

[Richard Li]

Hi, Gerald,

For my experience, every power chip vsys use for inside engine, if no power, totally no function, your sink shouldn't work.

Even you need dead battery function, you may connect one 33K resistor between cc-ccxdb pins to GND, avoid noise cause problem ( outside device no cc pin control.)

(33K only cause 0.1mA current when signal high)

Regards,

Richard Li