Rainbow Electronics MAX17047 - Manual (Page 21)

���������������������������������������������������������������� Maxim Integrated Products 21
MAX17047
ModelGauge m3 Fuel Gauge
When a proper end-of-charge event is detected, the
device learns a new FullCAP register value based on
the RemCap
REP
output. If the old FullCAP value was too
high, it is adjusted downward after the last valid end-
of-charge detection. If the old FullCAP was too low, it is
adjusted upward to match RemCap
REP
. This prevents
the calculated state of charge from ever reporting a value
greater than 100%. See
Figure 26 .
Figure 26. FullCAP Learning at End of Charge
CORRECT
END-OF-CHARGE
DETECTION AREA
CASE 1: OLD FullCAP TOO HIGH
CASE 2: OLD FullCAP TOO LOW
NEW FullCAP
AVERAGE CURRENT
CURRENT
1.25 x ICHGTerm
0.125 x ICHGTerm
0mA
CHARGING
DISCHARGING
RemCap REP