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4-Port USB 2.0 Controller
Datasheet
SMSC USB20H04 Page 33 Revision 1.63 (03-30-07)
DATASHEET
Chapter 10 Application Diagrams
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.
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
OUT1
OUT2
OUT3
OUT4
EN1
OC1
EN2
OC2
EN3
OC3
EN4
OC4
3.3V
1.8V
VBUSDET
USBDP0
USBDM0
SCK/SCL
SD/SDA
SCLK
SD
USBDP1
USBDM1
VBUS1_N
OCS1_N
GR1_N
AM1_N
IN
USB20H04
Dual
Voltage
Regulator
Quad
Power
Switch
Four
Downstream
Ports
Serial
EEPROM
Upstream
Port
5V
Self-Power
5V
Self-Power
V
BUS
D+
D-
IN
OUT1
OUT2
XTAL1
XTAL2
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
Figure 10.1 - High Level Block Diagram of a Self-Powered Hub