ViewSonic VP2650WB Service Manual page 75

GL852 will be reset twice with itself
(external and internal)
USB controller reset process:
1. first self power in, internal reset
wait for some time to check external reset
if up_5V in , normal mode
not in, suspend mode
2.first up_5v in, external reset
wait for self power in to do internal reset
if self power in, it will be in normal mode
if not in, it will not work
USB controller work mode:
1. self power in,
=>suspend mode ( uA)
2. up_5V in, then self power not in
=> don't work
R 19 +3.3V
100K
R 20
10K
10K pull-high for self power set up
510K pull-high for self power and bus power switch
U3
A V DD1 1
AVDD PAMBER2
2
AGND PGREEN2
DM0
3
DM0 DVDD
D P 0 4
DP0 PAMBER3
DM1
5
DM1 PGREEN3
D P 1
6 GL852
DP1 PWREN3#
A V DD2 7
AVDD OVCUR3#
LQFP48
8
AGND PWREN4#
DM2
9
DM2 OVCUR4#
D P 2 10
DP2 TEST
R R E F 11
RREF RESET#
A V DD3
12
AVDD DVDD
R 27
680 F
X1 X2
R 37 1M
Y 1
1 2MHZ
C 44 C 45
20P J 20P J
+ 5V _USB
US B 5V _UP
R 38 R 39
DNP
N C 10K
RE S ET
C 43
R 41
1U K 2 0 K J
speed up discharge with upstream plug off
ViewSonic Corporation
+ 5V _USB
U2
TAB
3
IN OUT
C 11
G1117-33T63UF C 12
+
0. 1U K 10U 25C
<Spec>
then up_5Vnot in
+3.3V
L4
Z30
C 17
10U 16V
+3.3V
L7
Z30
C 27
10U 16V
36 P A MBER2
P GRE E N2
35
D V DD2
34
33
R 25 0
32
31
30 / OC3
29
/ OC4
28
Z9 0
27
T1
26 RE S ET D P 0
D V DD1 DM0
25 +3.3V
NC
K
R 28 0
D N 5 BAV99
C 37
0. 1U K
+3.3V
U4
P A MBER1
1 8
CS VCC
P GRE E N1 2 7
SK DC
P A MBER2 3 6
DI ORG
P GRE E N2 4 5
DO GND
A T93C46-10S U-2.7 D P 3
DM3
Port # PAmber3 PAmber4
4 0 0
3 0 1
2 1 0
D P 4
DM4
72
Confidential - Do Not Copy
+3.3V 70-190mA
4
2
+ C 10
10U 25C
<Spec>
/ OC4
C 18 C 19 C 20 C 21 C 22
0. 1U K 0. 1U K 0. 1U K 0. 1U K 0. 1U K
/ OC3
C 28 C 29 C 30 C 31 C 32
0. 1U K 0. 1U K 0. 1U K 0. 1U K 0. 1U K
TP1 TP2 TP3
US B 5V _UP
J 4
1 G1
VCC G1
2
DATA-
3
DATA+
4 G2
GND G2
+3.3V 2B 12218B51
TP5
A
K A
D N 6 BAV99
C 38
0. 1U K
+3.3V
J J J J
BAV99 BAV99 BAV99 BAV99
C 39 C 40
D N 7 D N 8 D N 9 D N 10 0. 1U K 0. 1U K
R 36 0
Z9 0
V B US3
T4
NC
V B US4
R 40 0
R 42 0
NC
Z9 0
T5
TP14 TP15
TP17 TP18 TP19
R 43 0 R 44 R 45 R 46 R 47
15K 15K 15K 15K
VP2650wb-1
+ 5V _USB V B US4
F2
5V 0.75A
L3
Z220
R 16
10K + C 14
100U 25V
<Spec> C 16
0. 1U K
/ OC2
R 18
2 0 K J
+ 5V _USB
V B US3
F4
5V 0.75A
L6
Z220
R 22
10K + C 24
100U 25V
C 26
<Spec> / OC1
0. 1U K
R 24
2 0 K J
+3.3V
J J J J
BAV99 BAV99 BAV99
D N 1 D N 2
R 26 0 D N 3
D P 1
Z9 0
T2
DM1
NC
R 29 0
R 30 0
D P 2
Z9 0
T3
DM2
NC
R 31 0
R 32 R 33 R 34 R 35
15K 15K 15K 15K
C 41 C 42
0. 1U K 0. 1U K
TP13
J6
1 G4
VCCA G4
2
DATA-
3 G3
DATA+ G3
4
GND
5 G2
VCCB G2
6
DATB-
7 G1
DATB+ G1
8
GND
2B 12218A61
TP16
TP20
+ 5V _USB
V B US2
F1
5V 0.75A
L2
Z220
R 15
C 13
10K +
100U 25V
C 15
<Spec>
0. 1U K
R 17
2 0 K J
+ 5V _USB
V B US1
F3
5V 0.75A
L5
Z220
R 21
10K C 23
+
100U 25V
C 25
<Spec>
0. 1U K
R 23
2 0 K J
BAV99
C 33 C 34 C 35 C 36
D N 4 0. 1U K 0. 1U K 0. 1U K 0. 1U K
TP4
J 5
1 G4
V B US1
VCCA G4
2
DATA-
3 G3
DATA+ G3
4
GND
5 G2
V B US2
VCCB G2
6
DATB-
7 G1
DATB+ G1
8
GND
2B 12218A61
TP6 TP7 TP8
TP9 TP10 TP11 TP12
ViewSonic Corporation
Model
Title
USB CONTROLLER
Date Rev: