Battery voltages of each individual cell are monitored at the
center-tap connection by an internal A/D converter through the
VC pin. If one or both of the cells is determined to be
overcharged, an internal cell balancing network “bleeds” off
current at 15 A until both cells are charged to the same
maximum level. Depending on the condition of each cell, the
Si9730 will switch two external source-connected n-channel
MOSFETs on or off to allow the cells to be charged or to
provide current to the load