Part Number: TPS25751EVM
Hi Team,
We are using the TPS25751DREFR chipset for our power delivery application in sink mode only with a max 20V @ 5A supply. We also added a liquid detection feature in our design. Our design operates on an external source with very low internal battery capacity. So we required a minimum quiescent current during battery-operated mode.
PD will support external VIN_3V3 supply input when an external source is not present in VBUS. Since we are using only sink functionality, we removed JP13 from EVK and tested it, and it's working as expected with MCU (EEPROM is not connected).
Now we also require liquid detection functionality. I understand that PD will detect liquidonly when it is powered ON. In a normal use case, when there is no external supply present at VBUS, the PD will be powered OFF because the supply is not provided at the VIN_3V3 pin.
When liquid is present on the Type C port & we insert the Type C adapter, how will the chip behave?
For example, when type C is applied, PD will power on with a 5V supply. The MCU will boot from a 5V supply and program PD for 20V negotiation and liquid detection. Once the PD program is running, it will check for liquid detection. Since liquid is detected in the Type C port, PD will close the internal switch for its output (MCU supply).
Now after how much time duration will PD check again for liquid detection? Also, in our application liquid detection is only done after powering the PD; for some time liquid is present in the type C port with supply. So there are chances that it might damage the PD chipset or other sections in the boards as well, like the regulator and MCU.
Can you please confirm the actual scenario for this case? Also in our application, please confirm that we can use liquid detection withoutany damage in PD or other sections.
