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Hardware
2.3.6 Connecting Cells
The EVM is constructed with a single connection to the top and bottom of the cell stack. Cell voltage for these
cells is sensed on the board.
The cell simulator provides resistors between the cell inputs. When the cell simulator shunts are installed, these
resistors load the cells and divide the voltage to any unconnected inputs as cells are connected. If desired, then
the cell simulator shunts can be installed during cell connection and removed after cell connection. The shunts
must be removed after connection of cells or the cells are discharged by the constant drain of the cell simulator
resistors.
BAT- is the reference voltage for the IC and must be connected first. After BAT- cells can be connected in any
order. Cell connection from the bottom up minimizes the voltage step size applied to the board. Recommended
connection sequence for the EVM when connecting cells is bottom up:
1. Connect BAT–
2. Connect cells bottom up: CELL1, CELL2, CELL3 ...
3. Be sure the cell simulator shunts are removed
Figure 2-5
shows an example connecting cells with an EVM configuration reduced to 4 cells.
If connecting cells confirm operation before connecting.
Use all appropriate fusing, insulation, isolation and
shielding necessary for safe operation. Board has exposed
contacts. Do not leave unattended
For 4 cells, connect 3th
cell to CELL6 to CELL3
inputs
8
BQ76905 Evaluation Module
Remove cell
simulator shunts to
avoid draining cells
Figure 2-5. Example Connection with 4 Cells
Copyright © 2023 Texas Instruments Incorporated
www.ti.com
SLUUCY9 – NOVEMBER 2023
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