4.2.2 Manual Balancing
In manual cell balancing, all cells selected by the user are balanced at the same time. Because of this, there
must be constraints placed on the cell combinations that can be chosen. The BQ79616 has two conditions that
must be satisfied by a valid cell selection.
• No more than eight cells can be selected at once.
• If the user would like to Select Adjacent Cells, no more than two consecutive cells can be selected. With the
setting disabled, no adjacent cells can be selected.
If any of these conditions are not satisfied, the GUI alerts the user that the cell combination is invalid.
To configure manual balancing, select a valid cell combination and set cell timers.
4.3 Thresholds
The next step in configuring cell balancing is setting voltage and temperature thresholds, which BQ79616 can
use to stop and pause cell balancing, respectively. The fields under the Thresholds section control the
VCBDONE and OTCB thresholds. The user can also control whether or not balancing aborts upon the detection
of an unmasked fault by checking Stop Balancing on Fault.
4.3.1 VCBDONE Threshold
Here, the VCBDONE threshold can be set, and this stop threshold is monitored for each individual cell. This
means that each cell continues balancing until VCBDONE is reached independent of all other cells.
This threshold, when met, stops the balancing of each cell independent of how much time is left on the timer of
the cell and also marks balancing as complete.
4.3.2 OTCB Threshold
During passive balancing, heat is generated in the internal CBFET and external balancing resistors. Because of
this, the BQ79616 features an overtemperature threshold specific to cell balancing, called OTCB. If this
temperature threshold is reached during cell balancing at any point, cell balancing immediately pauses for all
cells. OTCB is represented as a percentage of TSREF. Balancing resumes when the temperature drops by the
amount specified by COOLOFF.
Note that to use this feature, the OT protector must be enabled and set to round robin mode.
4.4 Start Balancing
After the user has successfully configured the balancing sequence and thresholds, the user can start balancing
by pressing Run. Whenever balancing settings are changed, the user must press Run again to issue the
changes to the device.
Balancing can be paused and resumed by pressing Pause Balancing. Note that this does not stop balancing,
and the CB RUN indicator will still be green.
www.ti.com
Cell Balancing
SLUUC36 – DECEMBER 2020
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BQ79616-Q1 and BQ75614-Q1 GUI User's Guide 19
Copyright © 2020 Texas Instruments Incorporated
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