Rainbow-electronics MAX17047 Uživatelský manuál stáhnout pdf (Strana 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

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 45 46

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Rainbow-electronics MAX17047 Uživatelský manuál Strana 21