@Tim-D, I’ve performed some recent testing with variable power supply (Current and Voltage), and with 6V Panels. Tests were performed using the Vusb pin.
It appears that the Boron DPDM is going crazy during Sleep.
After Calling enableDPDM(); during setup, the Boron will obey both Current and Voltage limits per the user’s settings for a Solar Panel, while it’s awake (as expected). The Boron will automatically manage the current to maintain the Voltage Setpoint (Solar Panel).
But as soon as a Sleep event starts, one DPM mode (either VINDPM or IINDPM) is immediately failing and charging stops.
This is just my guess, as we have no way to read the PMIC status register REG08[3] from a Sleeping Boron to help determine what’s going wrong with DPDM during sleep w/ 1.3+ firmware.
This isn’t limited to Solar Powered Borons.