This function provides up to 150mA at 3.3V from a solar panel and LiPo battery. It is based on the BQ25504 from Texas Instruments to manage the energy from the solar cell and the battery, and the TPS78233 to regulate it to 3.3V.
- solar panel and connectors
- LiPo battery connector (but not the battery itself)
- power ON/OFF switch
- an optional signal can be sent by the BQ25504 to tell the host that the battery is running low, which can be used to put it in low power mode for instance