Part Number: TPS65987D
I'm looking to see what setting adjustment I need to get the TPS65987D able to charge from either a USB PD source or an old school 5V charger.
I currently have the device charging at 45W at the highest power possible from the PD source, but a user may only have an older charger.
The device is also configured as a DRP to allow it to act as a source if some other devices are inserted. Hopefully that does not impact this need.
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.
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In reply to Prajith Cheerakkoda:
Please close this thread if you don't have further queries.
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,
In reply to Chris Smith:
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.
This was in fact the issue. The 0x34 negotiated contract allowable current was zero and so the charger was not going. I implemented a if statement that if the mode is charging but the limit is zero to use 500mA and now it is fine on those types of chargers.
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