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Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. TECHNICAL BRIEF
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 CHSENSEN and the output current from DCIO via the sense resistor to
CHSENSEN. The voltage at CHSENSEN and the current feed to CHSENSEN 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.
Name
Type
Unused
Description
CHSENSEP
Analog
VBAT
Current sensing input positive
CHSENSEN
Analog
VBAT
Current sensing input negative
Table 3-5-1. Charger Control channel spec
Fig. 3-5-2. Battery charging block diagram
Fig. 3-5-1. Battery charging circuit
Charging
Route as a differential pair
Discharging
CHARGING CIRCUIT
Route as a differential pair
USB charging path
Phone ground return path
C352
0.1u
N5
VSS_BEAR
VSS_SPKR
M7
D7
VSS4
VSS3
D6
VDD_REF
P7
VDD_SPKR
VREF
A13
VSS1
D4
VSS2
D5
VBAT_D
E2
VBUS
VDD_AUDIO
P13
VDD_AUXO
P3
P6
VDD_BEAR
A12
VDD_IO
G1
SP
ARE1
B10
SP
ARE2
A2
TEST
D12
TRICKLE
F2
G2
F1
J2
DCIO_INT
FGSENSEN
J13
FGSENSEP
J14
A14
IREF
H3
CHREG
CHSENSEN
H2
CHSENSEP
H1
C4
DAC_CLK
C5
DAC_DAT
DAC_STR
B5
DCIO
A11
BDATA
0.1u
VBAT
C343
KDS221E_RTK
D303
3
A1_C2
2
A2
1
C1
47p
C325
VDDE_1V8
R311
BATT_GND
VBAT_D
1u
D1
D2
D3
D4
G1
G2
S1
S2
SIA911DJ
Q302
VBAT_D
100K
R320
C344
C347
1u
0.1u
C334
22p
CN301
G1
G2
1
2
3
R319
300K
C340
22p
1u
C353
VBAT
R315
0.1
2012
1/4W
1%
VBUS
0
R313
33u
C335
VDDC_2V65
USFB13L
D302
0.025
1%
2012
R324
1/4W
VDD_REF
R314
0
BDATA
CHS-
FGS+
FGS-
VBUS
CHS+
CHREG
DCIO_INT
OTP
FGS-
FGS+
RF_CTRL_CLK
RF_CTRL_DATA
RF_CTRL_STR_1
DCIO_INT
TRICKLE
BDATA
CHREG
CHS-
CHS+
VBUS
DCIO
CHREG
CHSENSE-
RCHSENSE=100m
:
ICH
VBAT_I
3.9V
cmp
TXON Clk
I
2
C Control Bus
VIMEAS to GPADC
VMEAS to GPADC
ISET
VSET
PWM
M2
M1
TRICKLE
RCHDISABLE
DCIO_INT
REGULATOR
CONTROL
(Digital)
VBAT D
Voltage
regulator
Supply
switch
Block supply
15kOhm
mIB
mVB
Charger type select
- +
cmp
DCIO detect
VDD_REF
Ericsson AB 3100
Содержание TU750
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