TPS65987D: What settings to make sink compatible with old school 5V charger too?

Hello Chris,

It should work with Legacy chargers. You must be using Type A to Type C cable for connecting to a Legacy Type A port. This kind of cable has Rp pull up resistor connected b/w CC and Vbus, so TPS65987D should work as Type C sink. 

If you are facing any issue, please share the scope trace of CC and Vbus lines. 

Thank You.

From what I can see the issues seem to be related to the TPS chip not having a good value for allowable current which then gets relayed to the MSP micro and then confuses it so that it doesn't charge properly.  I'll take a look at that portion of the code and see if there is a fall back option I can use for allowable current when there is not a USB-C PD connection,

Hi Chris,

I did not get your point, I'm not able to see this issue on EVM. it would be helpful if you can provide more information.

Thanks
Prajtih

I'm still having a bit of an issue on this.  I need a GPIO signal that goes to my charger.  I've tried many of the mapped events but none seems to do what I need.  I need to be able to tell my charger when to enable and have it work in both USB-C where a PD contract is negotiated and when we are connected to a old USB charger.  Right now I can't get one signal.  It almost needs to be PP1 switch closed AND acting as a sink.  Is there anything like that?

Thanks,

Chris

Hi Chris,

Sorry I did not get your requirement. Could you tell me more details about your system? 

Also, Please check if PDO_Negotiated_TT_x can be of help (I did not fully get your requirement, but looks like you are trying to detect PD or non-PD charger ont type C port. )

Thanks
Prajith

I would like one single GPIO which I can use to send a signal to the charger that a source (PD or conventional USB) is connected and ready to provide power.  The PDO negotiated stuff would only work on a PD source which will not meet both reqs.

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