20H04 Datasheet, PDF (36/38 Pages) SMSC Corporation – 4-PORT USB2.0 HUB CONTROLLER

Chapter 10 Application Diagrams
4-Port USB2.0 Hub Controller
Datasheet
The highly-integrated USB20H04 Hub Controller is complemented with a minimal number of external
components to create a complete four-port Hi-Speed USB hub application. Figure 10.1 illustrates one
possible hardware configuration, but is not a complete schematic. This block diagram shows a
self-powered hub with individual over-current protection and power switching on each downstream port.
Dual
Voltage
5V
Regulator
Self-Power
OUT1
IN
OUT2
Upstream
Port
V_BUS
D+
D-
Serial
EEPROM
SCLK
SD
USB20H04
3.3V
1.8V
XTAL1
XTAL2
VBUSDET
USBDP0
USBDM0
SCK/SCL
SD/SDA
USBDP1
USBDM1
VBUS1_N
OCS1_N
GR1_N
AM1_N
USBDP2
USBDM2
VBUS2_N
OCS2_N
GR2_N
AM2_N
USBDP3
USBDM3
VBUS3_N
OCS3_N
GR3_N
AM3_N
USBDP4
USBDM4
VBUS4_N
OCS4_N
GR4_N
AM4_N
5V
Self-Power
Quad
Power
Switch
IN
EN1
OC1
EN2
OC2
EN3
OC3
EN4
OC4
OUT1
OUT2
OUT3
OUT4
Four
Downstream
Ports
V_BUS
D+
D-
GND
GR
AM
V_BUS
D+
D-
GND
GR
AM
V_BUS
D+
D-
GND
GR
AM
V_BUS
D+
D-
GND
GR
AM
Figure 10.1 - High Level Block Diagram of a Self-Powered Hub
Revision 1.63 (10-14-04)
Page 36
DATASHEET
SMSC USB20H04