SLUAB35 September   2025 BQ76905 , BQ76907

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Normal Mode
    1. 2.1 For 7 Cell Battery Pack
    2. 2.2 Less Than 7 Cell Battery Pack
  6. 3Sleep Mode
  7. 4Startup Mode
  8. 5Cell Balance Mode
  9. 6Summary
  10. 7References

2.2 Less Than 7 Cell Battery Pack

For battery packs less than 7S, the cells must be connected in accordance with the connection method specified in Table 2-3, and Settings:Configuration:Vcell Mode must also be configured to the actual number of cells.

Table 2-3 Cell Usage and Connection
Number of Cell UsedConnected CellsShorted Cells
6VC7, VC6, VC5, VC3, VC2, VC1VC4
5VC7, VC5, VC3, VC2, VC1VC6, VC4
4VC7, VC5, VC3, VC1VC6, VC4, VC2
3VC7, VC5, VC1VC6, VC4, VC3, VC2
2VC7, VC1VC6, VC5, VC4, VC3, VC2

In the sampling cycle of BQ76907, to save sampling resources and improve sampling efficiency, BQ76907 can automatically skip channels that are not actually connected to cells. Taking the 4S battery pack as an example, as shown in Figure 2-4, BQ76907 automatically skips the sampling of the 2nd, 4th, and 6th channels. In this way, the number of slots in an ADSCAN LOOP is reduced from 8 to 5, greatly improving the sampling efficiency.

ADSCAN LOOP for 4S Pack Figure 2-4 ADSCAN LOOP for 4S Pack

The LOOP_SLOW Speed Control described in the previous section still applies here.