GL3522-22 Datasheet

© 2014 Genesys Logic, Inc. - All rights reserved.

Page 21

GLI Confidential

4.3.3 SELF/BUS Power Setting

By setting PSELF, GL3522-22 can be configured as a bus-power or a self-power hub.

1: Self Power

0: Bus Power

PSELF

Inside GL3522

On PCB

Figure 4.8 - SELF/BUS Power Setting

4.3.4 LED Connections

GL3522-22 controls the LED lighting according to the flow defined in Section 11.5.3 of Universal Serial Bus

Specification Revision2.0. Both manual mode and Automatic mode are supported in GL3522-22. When

GL3522-22 is globally suspended, GL3522-22 will turn off the LED to save power.

AMBER/GREEN

Inside GL3522

On PCB

DGND

LED

Figure 4.9 - LED Connection

4.3.5 Power Switch Enable Polarity

Both low/high-enabled power switches are supported. It is determined by jumper setting.

The power switch polarity will be configured by the state of pin AMBER2, as the following table:

Table 4.1 - Configuration by Power Switch Type

AMBER2

Power Switch Enable Polarity

0

Low-active

1

High-active

Note: When AMBER2=1, the external resistor of PWREN1~4 need pull down