LG KU580 Service Manual - Page 59

3. Technical Brief 3.5 Charger control A programmable charger in AB2010 is used for battery charging. It is possible to set limits for the output voltage at CHSENSE- and the output current from DCIO via the sense resistor to CHSENSE-. The voltage at CHSENSE- and the current feed to CHSENSE- cannot be measured directly by the GPADC. Instead, the two measuring amplifiers translate these inputs to a voltage proportional to the input and within the range of the GPADC. (Fig.2-5-1) shows the schematic of charging control part. C620 NA C621 NA C618 47u MC-146_12_5PFX600 R610 300K VBAT 1 4 C613 24p C614 RTCCLK 24p R611 0 K12 XTAL1 K11 XTAL2 J12 32KHZ 32.768KHz Close to Pin 1 1SS302-T5L_F_H DCIN_A 3 2 D601 SRST_n SCLK SDAT TP601 G10 SIMOFF_N K2 SRST_N J3 SCLK K3 SDAT CN600 C626 NA BATT_GND 1 42 3 Battery Conn. R613 2012 Phone ground 1% return path 1/4W 0 R614 Close to Pin 3 0.025 R617 VBAT 0 R619 2012 R621 1% 1/4W 0.1 0 R622 0 DRAIN1 S12 S11 DRAIN2 DCIN Q600 6 G1 3 G2 S21 S22 42 51 R623 47K H4 BDATA G12 FGSENSE+ C622 route as a differential pair 47p Close to AB G11 FGSENSE- R618 0 route as a differential pair H1 VBAT_D E1 CHSENSE+ F2 CHSENSE- E2 CHREG F3 DCIO Fig. 3-5-1. Battery charging circuit Name CHSENSE+ CHSENSE- LGE Internal Use Only Fig. 3-5-2. Battery charging block diagram Type Analog Analog Unused VBAT VBAT Description Current sensing input positive Current sensing input negative Table 3-5-1. Charger Control channel spec - 60 - Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes