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Xinyuan-LilyGO / LilyGo-T-Call-SIM800

https://www.aliexpress.com/item/33045221960.html
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On battery, board resets when USB is disconnected #70

Closed kickouille closed 4 years ago

kickouille commented 4 years ago

Hello,

I am getting an undesirable behaviour with my TTGO T-CALL with IP5306 version, and wanted to check if my board is faulty, if this is in general, and if maybe it is a HW or SW bug.

With a LiPo battery connected and charging through USB port (charger or PC), the board works well. If I disconnect the USB connection, the board seems to reset, and then it starts on battery.

I have many similar boards (T-BEAM and some other brands) with battery charging management chips, and none is behaving like so: when a battery is connected, pugging or unplugging the power source doesn't disturb the board.

If I connect the USB back, no reset. I did try to change some registers in the IP5306 but none fixed my issue. I am not able to find any clear documentation on how IP5306 behaves when 5V input is lost. Does it cut 5V output? Any way to prevent this? Is it doing something on the reset line?

Is anyone else encountering the same and if so was able to fix it?

kickouille commented 4 years ago

Closing as I just realized it is a duplicate from issue #47.