Philips ISP1122 User Manual

9397 750 07002

© Philips Electronics N.V. 2000. All rights reserved.

OC5/GOC

7

AI/I

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

modes 0, 1, 3: global overcurrent sense input (analog

DM4

8

AI/O

downstream port 4 D

−

 connection (analog)

DP4

9

AI/O

downstream port 4 D

+

 connection (analog)

SP/BP

10

I

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

HUBGL

11

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 k

Ω

 resistor

PSW3/GL3

12

O

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

13

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

14

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

15

I

crystal oscillator input (6 MHz)

XTAL2

16

O

crystal oscillator output (6 MHz)

17

I

reset input (Schmitt trigger); a LOW level produces an
asynchronous reset; connect to V

CC

 for power-on reset

(internal POR circuit)

OPTION/SCL

18

I/O

mode selection input; also functions as I

2

C-bus clock output

(open-drain, 6 mA)

INDV/SDA

19

I/O

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)

DM5

20

AI/O

downstream port 5 D

−

 connection (analog)

DP5

21

AI/O

downstream port 5 D

+

 connection (analog)

DM1

22

AI/O

downstream port 1 D

−

DP1

23

AI/O

downstream port 1 D

+

DM0

24

AI/O

upstream port D

−

 connection (analog)

DP0

25

AI/O

upstream port D

+

 connection (analog)

…continued