Philips Semiconductors ISP1521
Hi-Speed USB hub controller
Product data Rev. 03 — 24 November 2004 46 of 53
9397 750 13702 © Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Fig 20. Self-powered hub; ganged port power switching; global overcurrentdetection.
PSW1_N
TEST_HIGH
OC1_N
5.1 V ± 3 %
POWER SUPPLY
(kick-up)
−
+
1
VBUS
D+
D−
GND
port 2
to
port 6
SHIELD
+4.75 V
(min)
+4.95 V (min)
VREF(5V0)
GND

ISP1521

120 µF
ferrite bead
downstream
port connector
T1
0.1 µF
47 kΩ
004aaa306
VCC
ADOC
7
VBUS
D+
D−
GND
SHIELD
+4.75 V
(min)
120 µF
ferrite bead
low-ohmic
sense resistor
for overcurrent
detection
OC2_N
OC3_N
OC4_N
OC5_N
OC6_N
OC7_N
+ 5 V
PSW3_N
PSW2_N
PSW4_N
PSW5_N
PSW6_N
PSW7_N
TEST_LOW
3.3 V LDO
VOLTAGE
REGULATOR
3.3 V or 5.0 V