LG U310 Service Manual page 48

3.10.3.3. Charging control
A programmable charging block in PM6650-2M is used for battery charging. It is possible to set limits
for the charging current. The external supply typically connects directly to pin (VCHG). The voltage on
this pin (VCHG) is monitored by detection circuitry to ascertain whether a valid external supply is
applied or not. For additional accuracy or to capture variations over time, this voltage is routed
internally to the housekeeping ADC via the analog multiplexer. PM6650-2M circuits monitor voltages at
VCHARGER and ICHARGE pins to determine which supply should be used and when to switch
between the two supplies. These pins are connected to the Source (or emitter) and Drain (or collector)
contacts of the pass transistor respectively.
4.2V~3.80V
100~63 (%)
3.71V~3.64V
3.79V~3.72V
40~21 (%)
62~41 (%)
U310 Battery Bar Display
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3. TECHNICAL BRIEF
3.45V~3.25V
3.63V~3.46V
2~0 (%)
20~3 (%)