參數(shù)資料
型號： ISP1521
廠商： NXP Semiconductors N.V.
英文描述： Hi-Speed Universal Serial Bus hub controller
中文描述： 高速通用串行總線控制器樞紐
文件頁數(shù)： 14/53頁
文件大?。?/td> 270K
代理商： ISP1521
Philips Semiconductors
ISP1521
Hi-Speed USB hub controller
Product data
Rev. 03 — 24 November 2004
14 of 53
9397 750 13702
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9.1 Configuration through I/O pins
9.1.1
Number of downstream facing ports
To discount a physical downstream facing port, connect pins DP and DM of that
downstream facing port to V
CC
(3.3 V) starting from the highest port number (7); see
Table 4
.
The sum of physical ports configured is reflected in the bNbrPorts field.
9.1.2
Power switching
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
Table 5
.
Voltage drop requirements:
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
±
3 % power supply, the worst-case supply voltage is 4.85 V. This
only 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:
Power supply connector
Hub PCB (power and ground traces, ferrite beads)
Power switch (FET on-resistance)
Overcurrent sense device.
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. The individual voltage drop components are shown in
Figure 5
.
Table 4:
Number of physical
downstream facing port
7
Downstream facing port number pin configuration
DM1/DP1
DM2/DP2
DM3/DP3
DM4/DP4
DM5/DP5
DM6/DP6
DM7/DP7
15 k
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pull-down
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pull-down
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pull-down
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pull-down
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pull-down
15 k
pull-down
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pull-down
V
CC
15 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
V
CC
15 k
pull-down
15 k
pull-down
15 k
pull-down
V
CC
15 k
pull-down
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V
CC
15 k
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V
CC
6
5
V
CC
4
V
CC
V
CC
3
V
CC
V
CC
V
CC
2
V
CC
V
CC
V
CC
V
CC
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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ISP1521BE,518 功能描述:USB 接口集成電路 USB2 7-PORT HUB CTRLR RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20
ISP1521BE,551 功能描述:USB 接口集成電路 USB2 7 PORT HUB RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20
ISP1521BE,557 功能描述:USB 接口集成電路 DO NOT USE ORDER -S OR -T PART RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20
ISP1521BE518 制造商:ST-Ericsson 功能描述:IC CONTROLLER USB HUB 80LQFP
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