11-22-2019, 11:50 AM
(11-21-2019, 07:49 PM)tsys Wrote: I'm in general somewhat puzzled about how the Pinebook Pro is supposed to stay operational when the battery is low. The discharge cutoff voltage of the battery is specified as 2.75 V. However U3 is just a step-down regulator. Thus it won't be able to maintain VCC3V3_SYS at 3.3 V once the battery discharges below 3.3 V.
That's a great observation. I suspect the 2.75 V is specified to keep it in U3's operational range. With that info, it's prudent to monitor battery voltage while on battery as system behavior may be abnormal below 3.3 V.
I am waiting on the replacement M.2 PCIe NVMe adapter before I install one. I will circle back when I have and share observations. I have my eye on the MyDigitalSSD SBXe, as it is cheap and has an "active power" rating of 3 W with an operating voltage of 3.3 V +/- 5%.
