ISP1521BE ST-Ericsson Inc, ISP1521BE Datasheet - Page 14

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ISP1521BE

Manufacturer Part Number
ISP1521BE
Description
IC USB HUB CONTROLLER HS 80-LQFP
Manufacturer
ST-Ericsson Inc
Datasheet

Specifications of ISP1521BE

Controller Type
USB Hub
Interface
I²C
Voltage - Supply
3 V ~ 3.6 V
Operating Temperature
-40°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
80-LQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Supply
-
Other names
568-1170
ISP1521BE,557

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Philips Semiconductors
Table 4.
ISP1521_4
Product data sheet
Number of physical
downstream facing port
7
6
5
4
3
2
Downstream facing port number pin configuration
8.1.2.1 Voltage drop requirements
8.1.1 Number of downstream facing ports
8.1.2 Power switching
8.1 Configuration through I/O pins
To discount a physical downstream facing port, connect pins DP and DM of that
downstream facing port to V
Table
The sum of physical ports configured is reflected in the bNbrPorts field.
Power switching of downstream ports can be done individually or ganged, where all
ports are simultaneously switched with one power switch. The ISP1521 supports both
modes, which can be selected using input PSWn_N; see
Self-powered hubs are required to provide a minimum of 4.75 V to its output port
connectors at all legal load conditions. To comply with Underwriters Laboratory Inc. (UL)
safety requirements, the power from any port must be limited to 25 W (5 A at 5 V).
Overcurrent protection may be implemented on a global or individual basis.
Assuming a 5 V
allows a voltage drop of 100 mV across the hub Printed-Circuit Board (PCB) to each
downstream connector. This includes a voltage drop across the:
The PCB resistance and power supply connector resistance may cause a drop of 25 mV,
leaving only 75 mV as the voltage drop allowed across the power switch and overcurrent
sense device. Individual voltage drop components are shown in
Power supply connector
Hub PCB (power and ground traces, ferrite beads)
Power switch (FET on-resistance)
Overcurrent sense device
DM1/DP1
15 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
4.
DM2/DP2
15 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
3 % power supply, the worst-case supply voltage is 4.85 V. This only
Rev. 04 — 30 March 2006
CC
DM3/DP3
15 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
V
CC
(3.3 V) starting from the highest port number (7); see
DM4/DP4
15 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
V
V
CC
CC
DM5/DP5
15 k
pull-down
15 k
pull-down
15 k
pull-down
V
V
V
CC
CC
CC
Table
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Hi-Speed USB hub controller
5.
Figure
DM6/DP6
15 k
pull-down
15 k
pull-down
V
V
V
V
CC
CC
CC
CC
5.
ISP1521
DM7/DP7
15 k
pull-down
V
V
V
V
V
CC
CC
CC
CC
CC
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