Hi,
I'm considering the TPS25750D for a CPU board and have gone through the datasheet and the online configuration tool.
I would like my board to power up as power consumer/sink only and UFP-only, and negotiate the highest power profile available from the Host/Power Supply. For example, if it's a 60W PS, then I want the full 20V/60W, if it's a 45W then I want the full 20V/45W, and also I must/can support 5V/15W mode. In other words, I want PD to negotiate the highest power mode available, but I can still support the lowest 5V/15W mode.
Question 1: Will the "NegotiateHighVoltage" dead battery mode suffice? It should, but in the datasheet it says on p46 "This option is not recommended for systems that can boot from 5 V". Well my system can boot from 5V, but it can (and wants) to use higher power modes if available. I think the datasheet meant to say "... boot from 5V only.". Please clarify that I can use this "NegotiateHighVoltage" mode for my product as specified above.
Question 2: If "NegotiateHighVoltage" will work for my product, then I assume I DON'T need an external eeprom, correct? (no other configuration changes are needed, but I do want UFP data to work)
Question 3: In the config tool, if I set "What is the required sink power or power consumed?" to 60W (20V), will it also support 45W(15V), 27W(9V) and 15W(5V) power supplies? If I plug it into a 100W(20V) supply, will it limit the PD negotiation to 60W(20V)?
Question 4: If I do want to use this "limit" mode in Q3, then I must provide an external eeprom.
I appreciate a quick and clear answer to these questions.
Thanks,
Chris
