Fullsocthr register (13h), End-of-charge detection, Figure 24. fullsocthr register format (i – Rainbow Electronics MAX17047 User Manual
Page 20: Figure 25. false end-of-charge events
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MAX17047
ModelGauge m3 Fuel Gauge
FullSOCThr Register (13h)
The FullSOCThr register gates detection of end-of-
charge. SOC
VF
must be larger than the FullSOCThr
value before ICHGTerm is compared to the Average
Current register value. The recommended FullSOCThr
register setting for most applications is 95%. See the
ICHGTerm register description for details. The FullSOCThr
register is 70% at power-up.
register format.
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 24. FullSOCThr Register Format (Input)
Figure 25. False End-of-Charge Events
MSB—ADDRESS 13h
LSB—ADDRESS 13h
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
2
-1
2
-2
2
-3
2
-4
2
-5
2
-6
2
-7
2
-8
MSb
LSb
MSb
LSb
2
-8
UNITS: 0.0039%
2
0
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
CHARGING
DISCHARGING
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.