 2004 Microchip Technology Inc.

DS21818C-page 15

PS501

FIGURE 6-1:

CELL BALANCING

Cell balancing: entry from main

Charging

?

Set Appropriate Cell Balancing

(ADCON1) per Active Balance

flags (1 to 3)

Set flag_cell_balance_on = 1

YES

NO

Set Appropriate Cell Balance

flag(s) to Balance during Charge

(3 maximum)

Set All Cell Balance flags OFF

Set flag_cell_balance_on = 0

SOC <

r_e_imbalance_SOC (%)

?

> r_e_vcell_imbalance_set

?

YES

YES

NO

flags set ?

This algorithm makes the imbalance determination on the discharge cycle near EOD and uses the entire charge

cycle for balancing (good for low balance currents)

exit back to main

YES

NO

NO

flag_cell_imbalance_on

set ?

> r_e_vcell_imbalance_reset

?

YES

NO

Force ADCON1 CB bits to 0

(no balancing during discharge)

NO

YES