參數(shù)資料
型號： 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
文件頁數(shù)： 6/54頁
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
13 of 53
Philips Semiconductors
ISP1520
Hi-Speed USB hub controller
PSWn_N pins have integrated weak pull-up resistors inside the chip.
8.1.3 Overcurrent protection mode
The ISP1520 supports all overcurrent protection modes: none, global and individual.
No overcurrent protection mode reporting is selected when pin NOOC = HIGH. Global
and individual overcurrent protection modes are selected using pins PSWn_N, following
power switching modes selection scheme; see Table 6.
For global overcurrent protection mode, only PSW1_N and OC1_N are active; that is, in
this mode, the remaining overcurrent indicator pins are disabled. To inhibit the analog
overcurrent detection, OC_N pins must be connected to VREF(5V0).
Both analog and digital overcurrent modes are supported; see Table 7.
For digital overcurrent detection, the normal digital TTL level is accepted on overcurrent
input pins. For analog overcurrent detection, the threshold is given in Section 14. In this
mode, to lter out false overcurrent conditions because of in rush and spikes, a dead time
of 15 ms is built into the IC, that is, overcurrent must persist for 15 ms before it is reported
to the host.
(1) Includes PCB traces, ferrite beads, and so on.
Typical voltage drop components in self-powered mode using global overcurrent detection
5.1 V KICK-UP
POWER SUPPLY
± 3 % regulated
+
4.95 V (min)
004aaa262
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
low-ohmic
sense resistor
for overcurrent
detection
voltage drop
100 mV
Table 5.
Power switching mode: pin conguration
Power switching mode
PSW1_N
PSW2_N
PSW3_N
PSW4_N
Ganged
internal pull-up
ground
Individual
internal pull-up
Table 6.
Overcurrent protection mode pin conguration
Power switching mode NOOC
PSW1_N
PSW2_N
PSW3_N
PSW4_N
None
HIGH
ground
Global
LOW
internal pull-up
ground
Individual
LOW
internal pull-up
internal pull-up internal
pull-up
internal
pull-up
Table 7.
Overcurrent detection mode selection pin conguration
Pin ADOC
Mode selection
Description
3.3 V or 5.0 V
analog
threshold
Vtrip
Ground
digital
normal digital TTL level
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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 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2
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