ISP1122ABD datasheet(7/48 Pages) PHILIPS

7 / 48 page

Philips Semiconductors

ISP1122A

USB stand-alone hub

Preliminary speciﬁcation

Rev. 01 — 27 March 2000

7 of 48

9397 750 06986

OC5/GOC [3]

AI/I

modes 5, 7: overcurrent sense input for downstream port 5

(analog [5])

modes 0, 1, 3: global overcurrent sense input (analog [5])

DM4

AI/O

downstream port 4 D

− connection (analog) [4]

DP4

AI/O

downstream port 4 D

+ connection (analog) [4]

SP/BP

selects power mode:

self-powered: connect to VDD (local power supply); also use

this mode for hybrid-powered operation

bus-powered: connect to GND; disable downstream port 5 to

meet supply current requirements [4]

HUBGL

hub GoodLink LED indicator output (open-drain, 6 mA);

to connect an LED use a 330

Ω series resistor; if unused

connect to VCC via a 10 kΩ resistor

PSW3/GL3 [3]

modes 4 to 6: power switch control output for downstream

port 3 (open-drain, 6 mA)

modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 3 (open-drain, 6 mA); to connect an LED

use a 330

Ω series resistor

PSW4/GL4 [3]

modes 4 to 6: power switch control output for downstream

port 4 (open-drain, 6 mA)

modes 0 to 3, 7: GoodLink LED indicator output for

downstream port 4 (open-drain, 6 mA); to connect an LED

use a 330

Ω series resistor

PSW5/GL5/

GPSW [3]

mode 5: power switch control output for downstream port 5

(open-drain, 6 mA)

modes 3, 7: GoodLink LED indicator output for downstream

port 5 (open-drain, 6 mA); to connect an LED use a 330

Ω

series resistor

modes 0 to 2: gang mode power switch control output

(open-drain, 6 mA)

XTAL1

crystal oscillator input (6 MHz)

XTAL2

crystal oscillator output (6 MHz)

RESET [2]

reset input (Schmitt trigger); a LOW level produces an

asynchronous reset; connect to VCC for power-on reset

(internal POR circuit)

OPTION/SCL

I/O

mode selection input; also functions as I2C-bus clock output

(open-drain, 6 mA)

INDV/SDA

I/O

selects individual (HIGH) or global (LOW) power switching

and overcurrent detection; also functions as bidirectional

I2C-bus data line (open-drain, 6 mA)

DM5

AI/O

downstream port 5 D

− connection (analog) [4]

DP5

AI/O

downstream port 5 D

+ connection (analog) [4]

DM1

AI/O

downstream port 1 D

− connection (analog) [6]

DP1

AI/O

downstream port 1 D

+ connection (analog) [6]

DM0

AI/O

upstream port D

− connection (analog)

DP0

AI/O

upstream port D

+ connection (analog)

Table 3:

Pin description for LQFP32…continued

Symbol [1]

Type

Description

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