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PhiBabin / Redox-Lipo-Adapter

PCB that replaces the coin cell battery of a Redox keyboard by a rechargeable LiPo battery
MIT License
11 stars 3 forks source link

Yellow light issue #6

Open OrvilleQ opened 1 month ago

OrvilleQ commented 1 month ago

The yellow LED only lights up once when the USB is connected, instead of staying consistently lit when the USB is plugged in. This happens whether the battery is soldered on or not.

Is this the normal behavior of this board?

PhiBabin commented 1 month ago

On both of my board it stay light up when the USB is connected (they have a battery connected, but the batteries are not fully charged). Page 20 and 26 of the bq24075 datasheet shows a diagram of state machine that control the CHG pin of the yellow light. Maybe your battery is just already charged? I'm not sure about the behavior when the battery is not connected, it might be triggering a state where the battery is considered too low to charge. Another possibility is chip is not working properly due to a bad solder.

PhiBabin commented 1 month ago

I tried disconnecting the battery from the board and connecting the USB, and the yellow light only lights up once and then it shutdown.

OrvilleQ commented 1 month ago

After re-soldering the BQ24075RGTR, the yellow light is always on when the USB is plugged in with the battery already connected. So this may be a different manifestation of the same problem as the battery not working, because you also reproduced that when there is no battery connected, the yellow light only comes on once, which seems to be normal behavior.