Charging Part - LG U8130 Service Manual

3. TECHNICAL BRIEF

3.4.13 Charging Part

The charging block in AB2000 processes the charging operation by using VBAT voltage. It is enabled
or disabled by the assertion/negation of the external signal DCIO. Part of the charging block are
activated and deactivated depending on the level of VBAT. Figure shows the schematic of charging
part.
Figure. Charging Part
When VBAT is below a certain value, 3.2V, a current generator take care of initial charging of the
CHSENSE+ node and internal trickle charge signal is active. This part of the charging block is
powered on and active when DCIO is asserted. The DCIO signal is asserted when its voltage is above
the voltage at VBAT. As soon as generator is turned off and all parts of the charging block are
functional and active.
Battery block indication as shown in Fig
4.20 ~ 3.87 (V) 3.87 ~ 3.77 (V) 3.77 ~ 3.72 (V) 3.72 ~ 3.50 (V) 3.50 ~ 3.20 (V)
100 ~ 68 (%) 68 ~ 47 (%) 47 ~ 26 (%) 26 ~ 5 (%) 5 ~ 0 (%)
Figure. Battery Block Indication
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