USB2503-HZH Standard Microsystems Corp., USB2503-HZH Datasheet - Page 10

• Manufacturer Part Number: USB2503-HZH
• Description: Interface, Integrated USB2.0 Compatible 3-Port Hub
• Manufacturer: Standard Microsystems Corp.

Revision 1.3 (08-24-04)
Port 3 Green LED
High-Speed USB
strapping option.
strapping option.
strapping option.
Port [2:1] Green
Current Sensing
Switching and
Gang Power
Port Disable
USB Power
Removable
Port Non-
Enable
NAME
Data
LED
&
&
NON_REM[1:0]
PRTPWR[3:1]
USBDN[3:1]
USBDP[3:1]
GANG_EN
PRT_DIS0
SYMBOL
GR[2:1]/
GR3/
Table 4.1 3-Port Hub Pin Descriptions (continued)
3-PORT USB 2.0 HUB INTERFACE
TYPE
I/O12
I/O12
I/O12
IO-U
O12
These pins connect to the downstream USB peripheral
devices attached to the Hub’s ports.
Enables power to USB peripheral devices (downstream).
The active signal level of the PRTPWR[3:1] pins are
determined by the Power Polarity Strapping function of the
PRTPWR_POL pin.
Green indicator LED for port 3. Will be active low when LED
support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
these pins will be sampled at RESET_N negation to
determine if port 3 will be permanently disabled. Also, the
active state of the LED will be determined as follows:
PRT_DIS0 = ‘0’, All ports are enabled,
GR3 is active high.
PRT_DIS0 = ‘1’, Port 3 is disabled,
GR3 is active low.
Green indicator LED for ports 2 and 1. Will be active low
when LED support is enabled via EEPROM or SMBus.
If the hub is configured by the internal default configuration,
these pins will be sampled at RESET_N negation to
determine if ports [3:1] contain permanently attached (non-
removable) devices. Also, the active state of the LED’s will
be determined as follows:
NON_REM[1:0] = ‘00’, All ports are removable,
GR2 is active high,
GR1 is active high.
NON_REM1:0] = ‘01’, Port 1 is non-removable,
GR2 is active high,
GR1 is active low.
NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable,
GR2 is active low,
GR1 is active high.
NON_REM[1:0] = ‘11’, Ports 1, 2, & 3 are non-removable,
GR2 is active low,
GR1 is active low.
If the hub is configured by the internal default configuration,
this pin will be sampled at RESET_N negation to determine
if downstream port power switching and current sensing are
ganged, or individual port-by-port.
‘0’ = Port-by-port sensing & switching.
‘1’ = Ganged sensing & switching.
5
FUNCTION
Integrated USB2.0 Compatible 3-Port Hub
SMSC USB2503
Datasheet