+LTS/SOPINE USB voltage on power off using LiPo battery
Looking for advice on a quirk of the A64 LTS I have observed, using a LiPo battery as the power source.

When the Pine is shut down, the voltage on the USB hub (and 5V pins on the headers) drops to the battery voltage, between 3.6 to 4.2 volts, not zero as I would expect.

This is a problem for my application, so I have added a high-side MOSFET switch to save power (when shut down) and reduce the chances of damage to my USB peripherals (from low voltage).

So I'm wondering if there is a way in software/firmware to control this behavior, and if this is a bug or a feature? I've seen it on two from two LTS boards so far.

Possibly Related Threads…
Thread Author Replies Views Last Post
  Battery case and power question Twistedx 2 4,871 12-24-2018, 08:04 PM
Last Post: Twistedx
  Power Cord & SD Card Maximum 1 2,689 01-09-2017, 04:41 PM
Last Post: Ghost
  Can't get power button to work AidenH 17 19,700 08-28-2016, 07:19 AM
Last Post: DonFL
  Wires as power button Nittola 5 6,662 08-19-2016, 03:35 PM
Last Post: MarkHaysHarris777
  Power Jumper rahlquist 12 15,481 04-03-2016, 09:29 AM
Last Post: SkimMilk

Forum Jump:

Users browsing this thread: 1 Guest(s)