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3. Technical Brief
LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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.
Fig. 3-5-2. Battery charging block diagram
Table 3-5-1. Charger Control channel spec
Name
Type
Unused
Description
Analog
VBAT
Current sensing input positive
CHSENSE-
Analog
VBAT
Current sensing input negative
2012
1%
2012
1%
1/4W
Phone ground
return path
1/4W
Close to Pin 3
Close to AB
route as a differential pair
Battery Conn.
BATT_GND
Close to Pin 1
route as a differential pair
R622
0
0
R619
R614
0.1
R621
0.025
47K
0
R617
R623
R613
0
C613
24p
24p
C614
Q600
DRAIN1
DRAIN2
6
G1
G2
3
S11
1
S12
5
S21
2
S22
4
K12
XTAL1
XTAL2
K11
VBAT_D
H1
K2
SRST_N
SCLK
J3
K3
SDAT
G10
SIMOFF_N
G11
FGSENSE-
CHREG
E2
E1
F2
CHSENSE-
DCIO
F3
G12
J12
32KHZ
BDATA
H4
VBAT
TP601
1SS302-T5L_F_H
47p
D601
C622
C618
47u
300K
R610
0
R611
0
R618
1
2
3
4
VBAT
CN600
C621
NA
C620
NA
C626
1
2
3
4
NA
32.768KHz
X600
MC-146_12_5PF
DCIN_A
SRST_n
SCLK
SDAT
RTCCLK
DCIN
Fig. 3-5-1. Battery charging circuit