TCPP03-M20 not powering up USB-C port

[Barber.Mark]

Hi, i am using the TCPP03-M20 for the first time. This device is stand alone. i have the device setup for 5V, which is all that is required. there is no power to the device initially when connected to the USB-C port. CC1c and CC2c pins are at around 1.65V. i do not see any voltage on Vbus. have attached the schematic section for this circuit. .If i apply 3.3v to Vcc_Vconn VBUS is still 0V. Any help appreciated.

Mark

[db16122]

there are some I2C command need to be set for start power mode. Do you make any modification by I2C bus register setting？

[Barber.Mark]

hi, thanks for following up. currently i am running in dead battery mode to start so there is no cpu power. the frustrating thing is i also have the nucleo drp1m1 which has the same chip and it does power up for 5V operation when not connected. so in standalone mode it should enable 5V on the USB-C port. 

[Didier HERROUIN]

Dear Barber.Mark,

Could you confirm the level of EN signal ?

It should be “0” to enable the dead battery mode.

Best regards.

 

[Barber.Mark]

Hi, thanks for getting back to me the EN signal is 0V i have finally discovered the problem, the prototype had a protection diode the wrong way around was an assembly error. this was frustrating as it was the last thing i would have considered. 

[Didier HERROUIN]

Hello, indeed, it was not so easy to guess… thanks for sharing the last word in the story !