BATT CHARGING THEORY:A20
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BOARD - P6.0
The power management chip (Qualcomm PM1000) controls an external Lithium-
ion charge control IC U2101(Semtech SC801) which provides constant current and
voltage regulation for charging lithium ion batteries. Software is required to set up
pre-charge conditions and program the PM1000 internal trickle charger, select the
peak voltage (4.1V or 4.2V) for the battery based on the battery EPROM data,
select charge current based on midrate or fast charge accessory detected,
enable/disable fast charging, and monitor battery charge state for the battery meter.
Charge current requirements: Provide maximum rapid charge current of ~850mA
and maximum mid-rate charge current of ~250mA. Unlike P2K products, these
rates are controlled by hardware via a logic control signal from software.
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