Hi Bruce,
Separate comment - the figure you have pasted above from the TRM has been changed since when you pulled this one. The latest figure 8-4 is slightly different in the connections near the 7th cell vs the one you show here. However, it does still show the caps to gnd at each cell input. This is not necessary, it is ok to instead change the caps as being between adjacent cell pins. The only exception is the 7th cell, since the device is measuring that cell using a divided-down version of the 7P voltage, so there is no need for a cap between the VC6 pin and where the 7th cell gets measured (VC7SENSE), you instead have a cap at the VC7SENSE pin to gnd.
When using external cell balancing, it is recommended to reduce the series R going to the VC pins from 1k to approximately 200-Ohms, to avoid impacting the cell voltage measurement. You will need to ensure this still provides enough Vgs to turn on your external cell balancing FETs. This needs to be corrected in that figure as well.
Thanks,
Terry
Separate comment - the figure you have pasted above from the TRM has been changed since when you pulled this one. The latest figure 8-4 is slightly different in the connections near the 7th cell vs the one you show here. However, it does still show the caps to gnd at each cell input. This is not necessary, it is ok to instead change the caps as being between adjacent cell pins. The only exception is the 7th cell, since the device is measuring that cell using a divided-down version of the 7P voltage, so there is no need for a cap between the VC6 pin and where the 7th cell gets measured (VC7SENSE), you instead have a cap at the VC7SENSE pin to gnd.
When using external cell balancing, it is recommended to reduce the series R going to the VC pins from 1k to approximately 200-Ohms, to avoid impacting the cell voltage measurement. You will need to ensure this still provides enough Vgs to turn on your external cell balancing FETs. This needs to be corrected in that figure as well.
Thanks,
Terry
