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Philips Semiconductors
ISP1520
Hi-Speed USB hub controller
Product data Rev. 03 — 24 November 2004 43 of 51
9397 750 13701
© 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
PSW4_N
OC4_N
5 V ± 3 %
POWER SUPPLY
+
1
V
BUS
D+
D
GND
port 2
to
port 3
SHIELD
+4.75 V
(min)
+4.85 V (min)
V
REF(5V0)
GND
ISP1520
120 µF
ferrite bead
downstream
port connector
T1
T4
0.1 µF
47 k
004aaa305
3.3 V LDO
VOLTAGE
REGULATOR
V
CC
ADOC
4
V
BUS
D+
D
GND
SHIELD
+4.75 V
(min)
120 µF
ferrite bead
0.1 µF
47 k
TEST_LOW
PSW3_N
OC3_N
3.3 V or 5.0 V