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參數(shù)資料
| 型號： | ISP1123 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Universal Serial Bus compound hub |
| 中文描述： | 通用串行總線復(fù)合樞紐 |
| 文件頁數(shù)： | 24/49頁 |
| 文件大小： | 1155K |
| 代理商： | ISP1123 |
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Philips Semiconductors
ISP1123
USB compound hub
Preliminary specification
Rev. 01 — 5 October 1999
24 of 49
9397 750 06325
Philips Electronics N.V. 1999. All rights reserved.
In case of 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 8
.
12.1.2
Bus-powered hubs
Bus-powered hubs are guaranteed to receive a supply voltage of 4.5 V at the
upstream port connector and must provide a minimum of 4.4 V to the downstream
port connectors. The voltage drop of 100 mV across bus-powered hubs includes:
Hub PCB (power and ground traces, ferrite beads)
Power switch (FET on-resistance)
Overcurrent sense device.
The PCB resistance may cause a drop of 25 mV, which leaves 75 mV for the power
switch and overcurrent sense device. The voltage drop components are shown in
Figure 9
.
For bus-powered hubs overcurrent protection is optional. It may be implemented for
all downstream ports on a global or individual basis.
(1) Includes PCB traces, ferrite beads, etc.
Fig 8.
Typical voltage drop components in self-powered mode using global overcurrent detection.
handbook, full pagewidth
5.1 V KICK-UP
POWER SUPPLY
±
3% regulated
+
4.95 V(min)
MBL089
low-ohmic
PMOS switch
ISP1123
power
switch
VBUS
D
+
D
GND
SHIELD
4.75 V(min)
downstream
port
connector
hub board
resistance
voltage drop
25 mV
voltage drop
75 mV
low-ohmic
sense resistor
for overcurrent
detection
voltage drop
100 mV
(1)
(1) Includes PCB traces, ferrite beads, etc.
Fig 9.
Typical voltage drop components in bus-powered mode (no overcurrent detection).
handbook, full pagewidth
MBL090
low-ohmic
PMOS switch
ISP1123
power
switch
VBUS
D
+
D
GND
SHIELD
VBUS
D
+
D
GND
SHIELD
4.40 V(min)
4.50 V(min)
downstream
port
connector
upstream
port
connector
hub board
resistance
voltage drop
25 mV
voltage drop
75 mV
(1)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ISP1123D | Universal Serial Bus compound hub |
| ISP1123NB | Universal Serial Bus compound hub |
| ISP1130 | Universal Serial Bus compound hub with integrated keyboard controller |
| ISP1130DL | Universal Serial Bus compound hub with integrated keyboard controller |
| ISP1130N | Universal Serial Bus compound hub with integrated keyboard controller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISP1123BD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub |
| ISP1123D | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub |
| ISP1123NB | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub |
| ISP1130 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub with integrated keyboard controller |
| ISP1130DL | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub with integrated keyboard controller |
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