LG GT500 - Charger Control

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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL DESCRIPTION
Name Type Unused Description
CHS+ Analog VBAT Current sensing input positive
CHS- Analog VBAT Current sensing input negative
Table 3-5-1. Charger Control channel spec
Fig. 3-5-1. Battery charging circuit
3.5 Charger control
A programmable charger in AB3100 is used for battery charging. It is possible to set limits for the output
voltage at CHS- and the output current from DCIO via the sense resistor to CHS-. The voltage at CHS- and
the current feed to CHS- 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.
Direction of BAT and GND
Charging
Route as a differential pair
Phone ground return path
USB charging path
Discharging
Route as a differential pair
Make an Area at 8, 9 Layer
Causion when PCB lLayout
Charging Circuit
22p
C337
VDDC_2V65
VBUS
VDDE_1V8
2
C1
1
D302
KDS221E_RTK
A1_C2
3
A2
0.1u
C346 C347
1u
VBAT_H
1/4W
R324
VBAT
2012
1%
0.025
VBAT
M7
VSS_SPKR VSS_BEAR
N5
VBUS
E2
P13
VDD_AUDIO
P3
VDD_AUXO
VDD_BEAR
P6
VDD_IO
A12
VDD_REF
G1
VDD_SPKR
P7
A13
VREF
SRST_N
M2
D12
TEST
F2
TRICKLE
VBAT_D
G2
N3
SDAT
B10
SPARE1
A2
SPARE2
M1
SCLK
IREF
A14
H1
CHSENSEP
DAC_CLK
C4
DAC_DAT
C5
B5
DAC_STR
F1
DCIO
DCIO_INT
J2
J13
FGSENSEN
J14
FGSENSEP
BDATA
A11
CHREG
H3
H2
CHSENSEN
D1
D2
D3
D4
G1
G2
S1
S2
Q300 SIA911DJ
0.1u
C348
VA605
varistor
C349
0.1u
300K
R320
C330
22p
C331
33u
D301 RSX101VA-30TR
C345 1u
1%
1/4W
2012
0.1
R316
D1 D2
1 2 3
CN300
1u
R317
VDD_REF
VBAT
R321 100K
R314
0
TRICKLE
FGS+
FGS-
VBUS
CHS-
BDATA
FGS+
DCIO_INT
OTP
VBUS
CHREG
RF_CTRL_DATA
RF_CTRL_CLK
RF_CTRL_STR_1
CHREG
DCIO_INT
FGS-
CHS+
CHS+
BDATA
CHS-
SRST_n
SCLK
SDAT