USB2503-HZH Standard Microsystems Corp., USB2503-HZH Datasheet - Page 11

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

Integrated USB2.0 Compatible 3-Port Hub
Datasheet
SMSC USB2503
Polarity strapping.
Serial Clock/SMB
USB Transceiver
Serial Data/SMB
EEPROM Select
Programming
Over Current
Chip Select /
CFG_SEL1
Port Power
NAME
Sense
Select
Clock
SMB
Data
Bias
0
1
1
&
SDA/SMBDATA
PRTPWR_POL
CFG_SEL0
SCL/SMBCLK/
OCS[3:1]_N
CFG_SEL0
CFG_SEL1
SYMBOL
RBIAS
0
1
Table 4.1 3-Port Hub Pin Descriptions (continued)
Table 4.2 SMBus or EEPROM Interface Behavior
SMBus or EEPROM interface behavior.
Configured as an SMBus slave for external download of user-defined
descriptors. SMBus slave address is :0101101
Internal Default Configuration via strapping options.
2-wire (I2C) EEPROMS are supported, and CFG_SEL0 has no other
functionality.
IOSD12
IOSD12
SERIAL PORT INTERFACE
TYPE
I/O12
IPU
I-R
I
Port Power Polarity strapping determination for the active
signal polarity of the PRTPWR[3:1] pins.
While RESET_N is asserted, the logic state of this pin will
(though the use of internal combinatorial logic) determine
the active state of the PRTPWR[3:1] pins in order to ensure
that downstream port power is not inadvertently enabled to
inactive ports during a hardware reset.
When RESET_N is negated, the logic value will be latched
internally, and will retain the active signal polarity for
PRTPWR[3:1] pins.
‘1’ = PRTPWR[3:1] pins have an active ‘high’ polartity
‘0’ = PRTPWR[3:1] pins have an active ‘low’ polarity
Input from external current monitor indicating an over-
current condition. {Note: Contains internal pull-up to 3.3V
supply}
A 12.0kΩ (+/− 1%) resistor is attached from ground to this
pin to set the transceiver’s internal bias settings.
(Serial Data)/(SMB Data) signal.
(Serial Clock)/(SMB Clock) signal. This multifunction pin is
read on the rising edge of RESET_N negation and will
determine the hub configuration method as described in
Table
This pin is read on the rising edge of RESET_N negation
and will detemine the hub configuration method as
described in
6
4.2.
Table
4.2.
FUNCTION
Revision 1.3 (08-24-04)