參數(shù)資料
型號(hào)： ISP1520BD,557
廠商： ST-ERICSSON
元件分類： 總線控制器
英文描述： UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝： 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-314-2, LQFP-64
文件頁(yè)數(shù)： 5/54頁(yè)
文件大小： 288K
代理商： ISP1520BD,557
ISP1520_4
Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet
Rev. 04 — 28 April 2006
12 of 53
Philips Semiconductors
ISP1520
Hi-Speed USB hub controller
8.1.2 Power switching
Power switching of downstream ports can be done individually or ganged, where all
ports are simultaneously switched with one power switch. The ISP1520 supports both
modes, which can be selected using input PSWn_N; see Table 5.
8.1.2.1
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. Individual voltage drop components are shown in Figure 5.
For global overcurrent detection, an increased voltage drop is needed for the overcurrent
sense device (in this case, a low-ohmic resistor). This can be realized by using a special
power supply of 5.1 V
± 3 %, as shown in Figure 6.
Table 4.
Downstream facing port number pin conguration
Number of physical
downstream facing port
DM1/DP1
DM2/DP2
DM3/DP3
DM4/DP4
415 k
pull-down
15 k
pull-down
15 k
pull-down
15 k
pull-down
315 k
pull-down
15 k
pull-down
15 k
pull-down
VCC
215 k
pull-down
15 k
pull-down
VCC
(1) Includes PCB traces, ferrite beads, and so on.
Fig 5.
Typical voltage drop components in self-powered mode using individual overcurrent detection
5 V
POWER SUPPLY
± 3 % regulated
+
4.85 V (min)
004aaa261
low-ohmic
PMOS switch
ISP1520
power switch
(PSWn_N)
VBUS
D+
D
GND
SHIELD
4.75 V (min)
downstream
port
connector
hub board
resistance(1)
voltage drop
25 mV
voltage drop
75 mV
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISP1520BDGA 功能描述:IC USB HUB CONTROLLER HS 64-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤(pán)（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁(yè)面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2
ISP1520BD-S 制造商:ST-Ericsson 功能描述:Universal Serial Bus Hub Controller 64-Pin LQFP
ISP1520BD-T 功能描述:USB 接口集成電路 USB2 4 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(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20
ISP1520BDUM 功能描述:IC USB HUB CONTROLLER HS 64-LQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤(pán)（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁(yè)面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2
ISP1521 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IC USB HUB CONTROLLER HS 80-LQFP
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