![](http://datasheet.mmic.net.cn/230000/W6694A_datasheet_15631123/W6694A_11.png)
Preliminary Data Sheet
W6694A USB-ISDN S/T-Controller
-11-
Publication Release Date: May, 2001
Revision 1.03
5. SYSTEM DIAGRAM AND APPLICATIONS
Typical applications include :
§
USB TA for data only service
§
USB TA with one data plus one voice
VDD
3.3V
VDD
3.3V
VDD
3.3V
SX1A
SX2C
GND
SX2A
I
EPCS
VDD
I
I
G
VDD
USBDP
USBDN
GND
SR1
GND
I
I
GND
GND
I
VDD
GND
VDD
VDD
VDD
EPDO
I
SX2A
RESETN
I
EPDI
I
24MXI
24MXO
SR2C
I
SR1A
768MXI
SX1
I
I
SR2A
GND
USB_P+
R
SX1C
S
SR2A
USBDP
USBDN
VDD
EPCS
EPSK
EPDO
G
I
SR1
S
VDD
SR2
SX2
VDD
SX1C
7
24MXI
SR2C
768MXO
24MXO
SX1
SX2C
VDD
USB_P-
EPDI
7
V
G
I
VDD
V
G
I
SR1A
SX1A
I
SR2
SR1C
GND
SR1C
3.3V
1
1
W6694 DEMO BOARD
15.20X12.00
Size
Document Number
Date:
Sheet of
R9
9.1
ISDN1
ISDN CONNECTOR
1
2
3
4
5
6
7
8
ATACH1
SW DPDT
1
3
2
4
6
5
R19
560
FB4
FERRI BEAD
1
2
D4
LED
Y2
7.68MHz
1
2
J1
JP1
1
D18
1N4148
D21
1N4148
D3
LED
U2
NMC9346
DIP8
1
2
3
4
5
6
7
8
CS
SK
DI
DO
GND
NC
NC
VCC
U1
W6694-QFP48
37
38
39
40
41
42
43
44
45
46
47
48
1
2
3
4
5
6
7
8
9
1
1
1
13
14
15
16
17
18
19
20
21
22
23
24
2
2
2
2
3
3
3
3
3
3
3
2
VDDU
D+
D-
VDD3
UCLK1
UCLK2
VDD3I
VSS1
SR1
SR2
VDD1
SX1
S
X
X
V
V
G
G
G
G
P
P
P
VSS22
VDD22
PTXD
PRXD
EPCS
EPSK
EPDI
EPDO
TEST1#
TEST2#
VSS23
VDD23
I
I
I
I
I
I
I
I
S
N
V
R
R22
560
C2
10pF
1
2
D9
LED
R17
560
JP3
JUMPER
1
2
R8
100
R2
150
R5
1.5K
R6
33
C5
33pF
1
2
R18
560
CB2
0.1uF
1
2
D7
LED
D6
LED
FB2
FERRI BEAD
1
2
JP4
JUMPER
1
2
CB3
0.1uF
1
2
C7
0.1uF
1
2
D15
1N4148
FB3
FERRI BEAD
1
2
JP2
HEADER 4
1
2
3
4
C4
33pF
1
2
R20
560
CB5
0.1uF
1
2
D17
1N4148
R7
9.1
+
CB1
1uF
2:1
2:1
3
17
2
4
16
15
U3
UT28615
9
10
1
18
8
11
5
14
R11
8.2K
R10
1.8K
R14
8.2K
R4
33
D14
1N4148
D19
1N4148
Y1
24MHz
1
2
D1
1N4148
R16
560
D13
1N4148
+
C6
22UF
R21
560
R15
560
D20
1N4148
D11
1N4148
D10
1N4148
USB1
USBCONN
1
2
3
4
5
BUS_P
D-
D+
B_GND
C
R13
1.8K
D16
1N4148
RESET1
TR_RST
1
2
R3
220
C1
10pF
1
2
D8
LED
FB1
FERRI BEAD
1
2
R12
100
CB4
0.1uF
1
2
D5
LED
D2
LED
R1
22K
+
C3
1uF
D12
1N4148
D2:ISDN,D3:USB
FIGURE 5.1 USB TA ORCAD SCHEMATIC