Rainbow-electronics MAX17047 Bedienungsanleitung PDF herunterladen (Seite 20)

�� Maxim Integrated Products 20

MAX17047

ModelGauge m3 Fuel Gauge

FullSOCThr Register (13h)

The FullSOCThr register gates detection of end-of-

charge. SOC

must be larger than the FullSOCThr

value before ICHGTerm is compared to the Average

Current register value. The recommended FullSOCThr

ICHGTerm register description for details. The FullSOCThr

End-of-Charge Detection

The device detects the end of a charge cycle when

the application current falls into the band set by the

ICHGTerm register value. By monitoring both the current

and average current registers, the device can reject false

end-of-charge events such as application load spikes

or early charge-source removal. See the End-of-Charge

Detection graph in the Typical Operating Characteristics

and Figure 25.

Figure 24. FullSOCThr Register Format (Input)

Figure 25. False End-of-Charge Events

MSB—ADDRESS 13h LSB—ADDRESS 13h

-1

-2

-3

-4

-5

-6

-7

-8

MSb LSb MSb LSb

-8

UNITS: 0.0039%

UNITS: 1%

Figure 25

AVERAGE CURRENT

CURRENT

0mA

AVERAGE CURRENT

CURRENT

1.25 x ICHGTerm

0.125 x ICHGTerm

1.25 x ICHGTerm

0.125 x ICHGTerm

0mA

CHARGING

DISCHARGING

HIGH-CURRENT LOAD SPIKES DO NOT GENERATE END-OF-CHARGE

DETECTION BECAUSE CURRENT AND AVERAGE CURRENT READINGS

DO NOT FALL INTO THE DETECTION AREA AT THE SAME TIME.

EARLY CHARGER REMOVAL DOES NOT GENERATE END-OF-CHARGE

DETECTION BECAUSE CURRENT AND AVERAGE CURRENT READINGS

DO NOT FALL INTO THE DETECTION AREA AT THE SAME TIME.

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MAX17047 1
ModelGauge m3 Fuel Gauge 1

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