Charger Control - LG GD580 Service Manual

3. Technical brief

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.
Name
CHSENSE+
CHSENSE-
LGE Internal Use Only
V B A T
D 4 0 2
B t a e t y r C o n . n
C 4 0 1 C 4 2 5
3 3 u
2 2 p 2
P h o n e g o r u n d
1
e r u t n r p a h t
V B A T
C 4 4 3
2 2 p
B A T T _ G N D
2
1
S 2 G 2
D 2
D C N I
D 4
R 4 1
4 7 K
D 3
D 1
S 1 G 1
S A I 9 1 1 D J Q 4 0 2
Figure 3-5-1. Battery charging circuit
Figure 3-5-2. Battery charging block diagram
Type Unused
Analog VBAT
Analog VBAT
Table 3-5-1. Charger Control channel spec
X 4 0 1
C M 3 1 5 _ 1 2 _ 5 P F
1 2
C 4 4 2
3 2 7 . 6 8 K H z
2 2 p
R T C C L K
C 4 4 7 C 4 4 8
3 0 p 3 0 p
S R S T _ N
R T C _ G N D
S C L K
S D A T
R T C _ G N D G | N D _ D G I T I A L
R 4 4 0
0
0 1 2 R 4 3 3 C 4 0 2
C o l s e o t P n i 3
1 %
o r u e t a s a d f i e f e r n i t l a p a r i 4 7 p
2 5 M
4 / W
C o l s e o t
R 4 3 9
0
R 4 1 3
0
0 1 2
o r u e t a s a d f i e f e r n i t l a p a r i
R 4 3 2
1 %
4 / W 1 0 0 M
7 Z D 4 0 1
E 1 6
E D Z T 6 5 _ B
D C N I
D 4 0 4
R 4 4 7
V B U S
2 4
R B 5 2 1 S 3 - 0
Description
Current sensing input positive
Current sensing input negative
- 62 - Copyright © 2009 LG Electronics. Inc. All right reserved.
K 1 2
X T A L 1
K 1 1
X T A L 2
J 1 2
3 2 K H Z
G 1 0
I S M O F F _ N
K 2
S R S T _ N
J 3
S C L K
K 3
S D A T
H 4
B D A T A
G 1 2
F G S E N S E +
A B
G 1 1
F G S E N S E -
H 1
V B A T _ D
E 1
C H S E N S E +
F 2
C H S E N S E -
E 2
C H R E G
F 3
D C O I
J 1
V B U S
Only for training and service purposes