I am working with an HPA495 Advanced bqmtester.
For the most part it is all working. But I have a problem when trying to
calibrate the VTI. It may simply be how I wired it up.
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> My board is a three cell, BQ2933/BQ20x70-V160 circuit. I have Cell 1 - (from
the HPA495) to the minus end of the bottom cell connection, on my board. Cell 1
+ to the positive of the bottom cell. Cell 2 + to the positive of the next
cell, and Cell 3 + to the next one. I have cell 4 + not connected to anything.
In setup I have told it we are a 3 cell. If I run the "Configure VTI" in the
main program without connecting the Pack + connection to my board, I see a
nice, stable set of voltages. Cell1- to + is 3.718. Cell 1 + to Cell 2 + is
3.645. Cell 2 + to Cell 3 + is 3.683. Cell 1 - to Pack + is 14.2. That seems
to be the problem, because when I connect Pack + to my circuit, Cell 2 + to Cell
3 + goes up to over 4 volts, and is not stable. Should I be doing something
with the Cell 4 + connection? I thought it would take care of itself in setup,
when I told it I was a 3 cell.
I did see a post asking something similar and the answer was to connect the Cell 3 + to the Cell 4 +. When I tried that, the voltage between Cell 2 + and Cell 3 + went to 7.8 v. The total stayed at 14.2 or so.
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