Philips Semiconductors
ISP1122A
USB stand-alone hub
Pin description for SO32 and SDIP32
…continued
Pin
9
10
11
Type
AI/I
AI/I
AI/I
Description
overcurrent sense input for downstream port 3 (analog
[5]
)
overcurrent sense input for downstream port 4 (analog
[5]
)
modes 5, 7:
overcurrent sense input for downstream port 5
(analog
[5]
)
modes 0, 1, 3:
global overcurrent sense input (analog
[5]
)
downstream port 4 D− connection (analog)
[4]
downstream port 4 D+ connection (analog)
[4]
selects power mode:
self-powered:
connect to V
DD
(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]
Table 2:
OC3
OC4
Symbol
[1]
OC5/GOC
[3]
DM4
DP4
SP/BP
12
13
14
AI/O
AI/O
I
HUBGL
15
O
hub GoodLink LED indicator output (open-drain, 6 mA);
to connect an LED use a 330
Ω
series resistor; if unused
connect to V
CC
via a 10 kΩ resistor
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
PSW3/GL3
[3]
16
O
PSW4/GL4
[3]
17
O
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]
18
O
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
XTAL2
RESET
[2]
19
20
21
I
O
I
crystal oscillator input (6 MHz)
crystal oscillator output (6 MHz)
reset input (Schmitt trigger); a LOW level produces an
asynchronous reset; connect to V
CC
for power-on reset
(internal POR circuit)
mode selection input; also functions as I
2
C-bus clock output
(open-drain, 6 mA)
selects individual (HIGH) or global (LOW) power switching
and overcurrent detection; also functions as bidirectional
I
2
C-bus data line (open-drain, 6 mA)
downstream port 5 D− connection (analog)
[4]
downstream port 5 D+ connection (analog)
[4]
downstream port 1 D− connection (analog)
downstream port 1 D+ connection (analog)
© Philips Electronics N.V. 2000. All rights reserved.
OPTION/SCL
INDV/SDA
22
23
I/O
I/O
DM5
DP5
DM1
DP1
9397 750 06986
24
25
26
27
AI/O
AI/O
AI/O
AI/O
Preliminary specification
Rev. 01 — 27 March 2000
4 of 48
PHILIPS [ NXP SEMICONDUCTORS ]
