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參數資料
| 型號： | ISP1130 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Universal Serial Bus compound hub with integrated keyboard controller |
| 中文描述： | 通用串行總線控制器與集成鍵盤復合樞紐 |
| 文件頁數： | 53/68頁 |
| 文件大小： | 1786K |
| 代理商： | ISP1130 |
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Philips Semiconductors
ISP1130
USB compound hub with keyboard controller
Objective specification
Rev. 01 — 23 March 2000
53 of 68
9397 750 06895
Philips Electronics N.V. 2000. All rights reserved.
13. Overcurrent detection
The ISP1130 has an analog overcurrent detection circuit for monitoring downstream
port lines. This circuit automatically reports an overcurrent condition to the host and
turns off the power to the faulty port. The host must reset the condition flag.
Pins OC1/DPGL1 and OC2/DPGL2 can be used for individual port overcurrent
detection or GoodLink indication. The pin functionality is selected via bit
EnableOverCurrent in the USBCON register, see
Table 53
.
13.1 Overcurrent circuit description
The integrated overcurrent detection circuit of ISP1130 senses the voltage drop
across the power switch or an extra low-ohmic sense resistor. When the port draws
too much current, the voltage drop across the power switch exceeds the trip voltage
threshold (
V
trip
). The overcurrent circuit detects this and switches off the power
switch control signal after a delay of 15 ms (t
trip
). This delay acts as a ‘debounce’
period to minimize false tripping, especially during the inrush current produced by ‘hot
plugging’ of a USB device.
13.2 Power switch selection
From the voltage drop analysis given in
Figure 9
, the power switch has a voltage drop
budget of 75 mV. For individual self-powered mode, the current drawn per port can be
up to 500 mA. Thus the power switch should have maximum on-resistance of
150 m
.
If the voltage drop due to the hub board resistance can be minimized, the power
switch can have more voltage drop budget and therefore a higher on-resistance.
Power switches with a typical on-resistance of around 100 m
fit into this application.
The ISP1130 overcurrent detection circuit has been designed with a nominal trip
voltage (
V
trip
) of 85 mV. This gives a typical trip current of approximately 850 mA for
a power switch with an on-resistance of 100 m
1
.
13.3 Tuning the overcurrent trip voltage
The ISP1130 trip voltage can optionally be adjusted through external components to
set the desired trip current. This is done by inserting tuning series resistors at pins
OCn/DPGLn (see
Figure 10
). R
td
tunes down the trip voltage
V
trip
according to
Equation 1
.
(1)
with I
OC(nom)
= 0.5
μ
A.
1.
The following PMOS power switches have been tested to work well with the ISP1130: Philips PHP109, Vishay Siliconix Si2301DS,
Fairchild FDN338P.
V
trip
V
trip intrinsic
)
I
OC
R
td
–
=
相關PDF資料 |
PDF描述 |
|---|---|
| ISP1130DL | Universal Serial Bus compound hub with integrated keyboard controller |
| ISP1130N | Universal Serial Bus compound hub with integrated keyboard controller |
| ISP1160 | Embedded Universal Serial Bus Host Controller |
| ISP1160BD | Embedded Universal Serial Bus Host Controller |
| ISP1160BM | Embedded Universal Serial Bus Host Controller |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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 |
| ISP1130N | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Universal Serial Bus compound hub with integrated keyboard controller |
| ISP1160 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Embedded Universal Serial Bus Host Controller |
| ISP1160BD | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Embedded Universal Serial Bus Host Controller |
| ISP1160BD,157 | 功能描述:USB 接口集成電路 USB 1.1 HOST CONTROLLER RoHS:否 制造商:Cypress Semiconductor 產品:USB 2.0 數據速率: 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 |
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