Philips Semiconductors

Product specification

PDIUSBH12

USB 2-port hub

1999 Jul 22

6

PINNING

The PDIUSBH12 has two modes of operation. The first mode (Mode 0) configures the pins DNx_GL_N for GoodLink

™ LED indication. The

second mode (Mode 1) configures the LED pins as per port overcurrent condition pins. An overcurrent condition on any port can be uniquely

identified in Mode 1. However, all downstream ports are disabled as a result of a single overcurrent condition. In addition to the two modes of

operation, the PDIUSBH12 can also be configured to take either a 48 MHz crystal oscillator (for backward compatibility to PDIUSBH11) or a 12

MHz crystal.

The internal 4X clock multiplier PLL will be activated when 12 MHz input XTAL mode is selected. Also, the output clock frequency is now

programmable rather than fixed to 12 MHz. The output clock frequency can be programmed through the Set Mode command. All these new

features are added while maintaining backward compatibility to the PDIUSBH11 through TEST2 and TEST1 pins.

TEST2

TEST1

MODE

INPUT XTAL FREQUENCY

(MHz)

OUTPUT CLOCK FREQUENCY

(AT REST)

00

MODE 0

(GoodLink

™)

48

12MHz

01

MODE 0

(GoodLink

™)

12

4 MHz

10

MODE 1

(Individual Overcurrent)

12

4 MHz

11

MODE 1

(Individual Overcurrent)

48

12 MHz

NOTE:

1. Pin TEST3 should always be connected to Ground at all times.

Pin configuration

1

2

3

4

5

6

7

8

9

10

11

12

17

18

19

20

21

22

23

24

25

26

27

28

TEST1

TEST2

TEST3

RESET_N

GND

XTAL1

XTAL2

CLKOUT

OCURRENT_N /

OCURRENT2_N

SWITCH_N

UP_DM

UP_DP

AGND

DN2_DM

DN2_DP

DN3_DM

GND

DN3_DP

SCL

SDA

INT_N

SUSPEND

13

16 RSVD

DN2_GL_N

14

15 RSVD

DN3_GL_N /

OCURRENT3_N

SV01751

NOTE:

Pin 10 and Pin 14 show alternative pin functions, depending on

mode of operation (Mode 0 or Mode 1) as described in

Pin Description.