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3.5 Charger control
A programmable charger in AB3000 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.3-5-1) shows the schematic of charging control part.
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Name
Type Unused
Description
Analog
VBAT
Current sensing input positive
CHSENSE-
Analog
VBAT
Current sensing input negative
Close to AB
BATT_GND
2012
Close to Pin 3
Battery Conn.
route as a differential pair
return path
2012
1/4W
Phone ground
1%
1%
1/4W
route as a differential pair
Close to Pin 1
VBAT
D1
D2
D3
D4
G1
G2
S1
S2
SIA911DJ
Q600
33u
C617
0.1
R611
C621
47p
1
2
3
4
CN600
KDS221E_RTK
A1_C2
3
A2
2
1
C1
D601
300K
R606
K12
XTAL1
XTAL2
K11
VBAT_D
H1
VBUS
J1
G10
SIMOFF_N
K2
SRST_N
SCLK
J3
K3
SDAT
CHSENSE-
DCIO
F3
G12
G11
FGSENSE-
BDATA
H4
CHREG
E2
E1
F2
VBAT
J12
32KHZ
R608
0.025
4
0
R610
32.768KHz
X600
MC-146_12_5PF
1
2
3
24p
C612
C613
24p
DCIN_A
47K
R613
DCIN
RTCCLK
SRST_n
VBUS
SCLK
SDAT
Fig. 3-5-1. Battery charging circuit
Fig. 3-5-2. Battery charging block diagram
Table 3-5-1. Charger Control channel spec
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Содержание KT520
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