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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL DESCRIPTION
Name Type Unused Description
FGS+ Analog VBAT Fuel gauge current sensing input positive
FGS- Analog VBAT Fuel gauge current sensing input negative
Table 3-5-2. Fuel Gauge channel spec
Fig. 3-5-2. The analog front-end of the fuel gauge block
Fig. 3-5-3 The Schematic of the fuel gauge block
3.5.1 Fuel Gauge
AB3100 supports the measurement of the current consumption/charging current in the GT500 with a fuel
gauge block. By constantly integrating the current flowing into and out of the battery, the fuel gauge
block is used to determine the remaining battery capacity.
The function of the fuel gauge block is schematically described in (Fig.3-5-3). A sense resistor R_FGSENSE
is connected in series with the battery. The voltage across the resistor, equivalent to the current
entering/leaving the battery, is integrated using an ADC block.
Route as a differential pair
Phone ground return path
1/4W
R324
2012
1%
0.025
FGS+
FGS-
SRST_N
M2
VBAT_D
G2
N3
SDAT
M1
SCLK
H1
CHSENSEP
J13
FGSENSEN
J14
FGSENSEP
BDATA
A11
CHREG
H3
H2
CHSENSEN
VA605
varistor
VBAT
FGS+
FGS-
CHREG
CHS+
BDATA
CHS-
SRST_n
SCLK
SDAT
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