LG GD580 - Bluetooth Pairing and Headset Usage; Settings Customization

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. Technical brief
Figure 3-5-3. The analog front-end of the fuel gauge block
3.5.1 Fuel Gauge
AB3000 supports the measurement of the current consumption/charging current in the GD580
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.
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Name Type Unused Description
FGSENSE+ Analog VBAT Fuel gauge current sensing input positive
FGSENSE- Analog VBAT Fuel gauge current sensing input negative
Table 3-5-2. Fuel Gauge channel spec
Figure 3-5-4 The Schematic of the fuel gauge block