gl850g Genesys Logic, gl850g Datasheet - Page 21

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gl850g

Manufacturer Part Number
gl850g
Description
Gl850g Usb 2.0 Low-power Hub Controller
Manufacturer
Genesys Logic
Datasheet

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©2000-2008 Genesys Logic Inc. - All rights reserved.
GL850G 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 GL850G. When
GL850G is globally suspended, GL850G will turn off the LED to save power.
The USB data lines are required by the USB specification to have a maximum output voltage between 2.8V
and 3.6V. Since the power provided by the USB cable is specified to be between 4.4V and 5.0V, an on-chip
regulator is used to drop the voltage to the appropriate level for sourcing the USB transceiver and external
pull-up resistor. An output pin driven by the regulator is provided to source the 1.5-k external resistor.
Features:
GL850G replies to host commands by the default settings in the internal ROM. GL850G also offers the
ability to reply to the host according to the settings in the external EEPROM (93C46). The following table
shows the configuration of 93C46.
5.2.4 LED Connections
5.2.5 Built-in power regulator
5.2.6 EEPROM Setting
5V to 3.3V PMOS type linear regulator.
200mA output driving capability
28uA maximum quiescent current.
AMBER/GREEN
Inside GL850G
1: Power Self
0: Power Bus
Figure 5.7 – SELF/BUS Power Setting
Inside GL850G
Figure 5.8 – LED Connection
GL850G USB 2.0 Low-Power HUB Controller
On PCB
On PCB
PSELF
LED
DGND
Page 21

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