Charger Control - LG U400 Service Manual

3. Technical Brief

3.4.10 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.3-4-12) shows the schematic of charging control part.
05.09.07 BATTERY TEMP SENSOR MOVE FROM BOARD TO BATTERY
Name
CHSENSE+
CHSENSE-
VBAT_TEMP
DCIN_3
R599
270K_1%
1%
D7 D6 D5 D4
Q500
SI7411DN-T1-E3
S3 S2
Fig. 3-4-11. Battery charging circuit
Fig. 3-4-12. Battery charging block diagram
Type Unused
Analog VBAT
Analog VBAT
Table 3-4-6. Charger Control channel spec
VDIG27
R546
0.1
2012
C531 C532 C533
VCORE15
0.1u 0.1u 22p
VDDE18
D3 D2 D1
G
S1
C539
0.1u C540
0.1u
Description
Current sensing input positive
Current sensing input negative
- 66 -
B11
B_DATA
E2
DCIO
D1
CH_REG
D3
CHSENSE+
D2
CHSENSE-
M9
VDD_ADC
J8
DIG_VDD
M5
VDD_CODEC
M3
VDD_BEAR
C3
VDD_IO
M10
VDD_IO_18
D10
SUB
D4
TEST
J12
VREF
H12
IREF