isp1521 NXP Semiconductors, isp1521 Datasheet - Page 43

• Manufacturer Part Number: isp1521
• Description: Hi-speed Universal Serial Bus Hub Controller
• Manufacturer: NXP Semiconductors

Philips Semiconductors
16. Application information
ISP1521_4
Product data sheet
Fig 17. Descriptors configuration selection application diagram
facing port GoodLink
upstream
amber LEDs,
The I
(1) The function on port 7, which is a nonremovable port, is optional.
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
7 USB downstream facing ports
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
ISP1521
(1) R
PMOS
. .
= V
adj(oc)
= 0.6 A.
= voltage drop on PMOS
trip
is optional.
= V
amber LEDs,
green and
port 7
trip(intrinsic)
Rev. 04 — 30 March 2006
(1)
ROM
5 V
V
(I
REF(5V0)
OC(nom)
DSon
Figure
ISP1521
acting as I
external microcontroller
is used, analog overcurrent detection can be
R
USB function
adj(oc)
18.
2
PSWn_N
C-bus master
), where:
I
2
C-bus
004aaa260
OCn_N
R adj(oc) (1)
I
OC
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Hi-Speed USB hub controller
DSon
Table
of approximately 100 m
11.
EEPROM
ISP1521
004aaa302
43 of 55