Hello,
I would like to use the BQ25892 in default mode (no host) with the following design:
My objective is to power my device from the USB line while charging the battery (LiPo 3.7V 1300mAh), the device should be powered when no battery present or directly from the battery when the USB line is not connected. From the documentation I am not sure if all this scenarios are possible without a host.
So my first question is, are all this scenarios possible without host ? if not which ones are and is there cases where the functionality would be impaired? (e.g. compulsory power cycle after the 12h watchdog timer have run out, etc.)
While validating the design with our prototypes, the output of the pin SW was 0.7V when no battery was connected to the system and the input VBUS was 5V from a power supply with ample reserve. From other post in this forums I have been able to deduce that this should not be the case, but I haven't been able to find the reason why this could happen.
After connecting the LiPo to the system and keeping the VBUS input at 5V the output SW was 3.75V, the same voltage as the LiPo, however, this voltage never increased even after an hour of being connected, as I expected if the LiPo was to be charged.
My second question is, how do I go about to troubleshooting this problems without a host interface?
Looking forward to your answer, thank you for your support.