Philips ISP1521 Benutzerhandbuch
Philips Semiconductors
ISP1521
Hi-Speed USB hub controller
Product data
Rev. 03 — 24 November 2004
45 of 53
9397 750 13702
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
17.3 Self-powered hub configurations
Fig 19. Self-powered hub; individual port power switching; individual overcurrent
detection.
PSW1_N
PSW2_N
TEST_HIGH
OC1_N
OC2_N
PSW7_N
OC7_N
5 V
±
3
%
POWER SUPPLY
−
+
1
VBUS
D
D
+
D
−
GND
port 2
to
port 6
SHIELD
+
4.75 V
(min)
+
4.85 V (min)
VREF(5V0)
GND
ISP1521
120
µ
F
ferrite bead
downstream
port connector
T1
T7
0.1
µ
F
47 k
Ω
004aaa304
3.3 V LDO
VOLTAGE
REGULATOR
VCC
ADOC
7
VBUS
D
D
+
D
−
GND
SHIELD
+
4.75 V
(min)
120
µ
F
ferrite bead
0.1
µ
F
47 k
Ω
TEST_LOW
PSW3_N
OC3_N
PSW4_N
OC4_N
PSW5_N
OC5_N
PSW6_N
OC6_N
3.3 V or 5.0 V