DC Power Supply
+ -
EV2300/
EV2400
I2C
SMB
DC Power Supply
+ -
(Load)
bq76920 Circuit Module Use
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Figure 6. Simulating Current Setup
4.3 Reducing the Cell Count
Cell count can be reduced for basic evaluation by shorting unused cells at the input terminal block. Follow
the recommendations in the datasheet for which cells to short. This works for both operation with the cell
simulator and cells, but can have some side effects in transient tests because it parallels the shorted
resistors to the cell IC where the capacitor provides a signal path to the used input. For the best
evaluation with reduced cells in a transient environment, short the VCx pins at the capacitor or VCx test
points and remove the unused input resistor. When using the cell simulator, shorting the unused cell
resistor is still required to eliminate the simulated cell voltage. Shorting the cell inputs at the terminal block
screw terminals is suggested since it should be apparent if the board is re-used for a different cell count.
Table 3. Reducing cell count
Unused Cell
Short Cell Terminals Input Resistor to Remove Short AFE Inputs
(Numbered from Bottom Cell 1)
Cell 4 C4 to C3 R5 VC4 to VC3
Cell 3 C3 to C2 R6 VC3 to VC2
12
bq76920 Evaluation Module User's Guide SLVU924B–March 2014–Revised April 2014
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