isp1520 NXP Semiconductors, isp1520 Datasheet - Page 41

• Manufacturer Part Number: isp1520
• Description: Hi-speed Universal Serial Bus Hub Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
16. Application information
ISP1520_4
Product data sheet
Fig 17. Descriptors configuration selection application diagram
facing port GoodLink
upstream
The I
(1) The function on port 4, which is a nonremovable port, is optional.
amber LEDs,
green and
port 1
2
C-bus cannot be shared between the EEPROM and the external microcontroller; see
16.1 Descriptor configuration selection
16.2 Overcurrent detection limit adjustment
four USB downstream facing ports
amber LEDs,
green and
port 2
For an overcurrent limit of 500 mA per port, a PMOS with R
is required. If a PMOS with a lower R
adjusted by using a series resistor; see
Fig 18. Adjusting analog overcurrent detection limit (optional)
V
I
OC(nom)
PMOS
V
ISP1520
(1) R
PMOS
amber LEDs,
= V
green and
adj(oc)
= 0.6 A.
= voltage drop on PMOS
port 3
trip
is optional.
= V
amber LEDs,
green and
port 4
trip(intrinsic)
Rev. 04 — 28 April 2006
5 V
ROM
(1)
V
REF(5V0)
(I
OC(nom)
DSon
Figure
ISP1520
acting as I
external microcontroller
is used, analog overcurrent detection can be
R
USB function
PSWn_N
adj(oc)
18.
2
C-bus master
), where:
I
2
C-bus
004aaa259
OCn_N
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Hi-Speed USB hub controller
R
DSon
Table
adj(oc)
I
OC
of approximately 100 m
(1)
11.
EEPROM
ISP1520
004aaa303
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