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ISP1122ABD 数据表(PDF) 10 Page - NXP Semiconductors

部件名 ISP1122ABD
功能描述  Universal Serial Bus stand-alone hub
PDF  48 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

ISP1122ABD 数据表(HTML) 10 Page - NXP Semiconductors

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Philips Semiconductors
ISP1122A
USB stand-alone hub
Preliminary specification
Rev. 01 — 27 March 2000
10 of 48
9397 750 06986
© Philips Electronics N.V. 2000. All rights reserved.
6.9 PLL clock multiplier
A 6 to 48 MHz clock multiplier Phase-Locked Loop (PLL) is integrated on-chip. This
allows for the use of low-cost 6 MHz crystals. The low crystal frequency also
minimizes Electro-Magnetic Interference (EMI). The PLL requires no external
components.
6.10 Overcurrent detection
An overcurrent detection circuit for downstream ports has been integrated on-chip. It
is self-reporting, resets automatically, has a low trip time and requires no external
components. Both individual and global overcurrent detection are supported.
6.11 I2C-bus interface
A basic serial I2C-bus interface (single master, 100 kHz) is provided to read VID, PID
and configuration bits from an external I2C-bus EEPROM (e.g. Philips PCF8582 or
equivalent). At reset the ISP1122A reads 6 bytes of data from the external memory.
The I2C-bus interface timing complies with the standard mode of operation as
described in
The I2C-bus and how to use it, order number 9398 393 40011.
7.
Modes of operation
The ISP1122A has several modes of operation, each corresponding with a different
pin configuration. Modes are selected by means of pins INDV, OPTION and SP/BP,
as shown in Table 4.
[1]
Port power switching: logic 0 = ganged, logic 1 = individual.
[2]
Power mode: logic0=bus-powered, logic 1 = self-powered (or hybrid-powered).
[3]
No overcurrent detection.
[4]
No power switching.
Table 4:
Mode selection
Mode
INDV
[1]
OPTION SP/BP
[2]
PSWn/GLn
(n = 1 to 4)
PSW5/GL5/GPSW OCn
(n = 1 to 4)
OC5/GOC
0000
GoodLink
ganged power
inactive
global overcurrent
1001
GoodLink
ganged power
inactive
global overcurrent
2010
GoodLink
ganged power
inactive [3]
inactive [3]
3011
GoodLink [4]
GoodLink [4]
inactive
global overcurrent
4100
individual power
inactive
individual
overcurrent
inactive
5101
individual power
individual power
individual
overcurrent
individual
overcurrent
6110
individual power
inactive
inactive [3]
inactive [3]
7111
GoodLink [4]
GoodLink [4]
individual
overcurrent
individual
overcurrent



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