Download AN1571 - Intersil

Application Note 1571
You can observe the D- and D+ USB signal of high-speed
Channel 1 on an oscilloscope or other test equipment by
connecting a differential probe at JP7.
TABLE 2. TEST POINTS
DESIGNATOR
DESCRIPTION
TP1
VDD test point
TP2
Ground test point
TP3
SEL test point
TP4
OE/ALM test point
TP6
VBUS from Pin 1 of Connector J5 test point
JP8
D-/D+ differential probe connection; COM side of
switch
JP7
D-/D+ differential probe connection; Device 1 side of
switch
JP6
D-/D+ differential probe connection; Device 2 side of
switch
You can observe the D- and D+ USB signal of high-speed
Channel 2 on an oscilloscope or other test equipment by
connecting a differential probe at JP6.
You can observe the D- and D+ USB signal at the COM side of
the switch on an oscilloscope or other test equipment by
connecting a differential probe at JP8.
ISL54224IRTZEVAL1Z Board Schematic
SEL
TP3
1
OE/ALM
OE/ALM
1
JP1
1
S1
2 2
VDD
J3
SEL
J4
1
3
1
3
1
1
0
0
J2
TP4
S2
1
2
JP2
1
1
1
1
2
C1
R1
10µF
C2
TP1
100K
1
A
R2
GND
J1
TP2
1
0.1µF
0
R3
2
0
A
JP3
1
C3
5 MOUNT
1
1
1
1
2
2
2
2
3
3
3
4
0.01µF
4
9
U1
3
8
DFN10
4 GENERIC 7
PACK.
6
5
4
1
DIFF
PROBE 3
6
MOUNT
J7
2
4
5
JP6
11
A
10
1
9
2
8
3
7
4
6
EP
1
2
3
4
DIFF PROBE
6
1
2
3
4
USB TO
DEVICE 1
MOUNT
J6
JP7
A
A
1
JP4
EP
A
A
A
A
A
DIFF PROBE
JP8
1
2
2
4
3
1
VBUSCH2
10
DUSB_ARA42_T11A
USB TO
DEVICE 2
DUSB_ARA42_T11A
MOUNT 5
J8
A
TP6
1
1
2
3
A
1
USB
897-30-004-90-000
3
2
JP5
1
4
4
MOUNT
5
MOUNT
2
6
USB
TO
HOST
1
J9
VBUSCH1
J5
A
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cautioned to verify that the Application Note or Technical Brief is current before proceeding.
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5
AN1571.0
June 8, 2011