USB2502-AEZG Standard Microsystems (SMSC), USB2502-AEZG Datasheet - Page 12

• Manufacturer Part Number: USB2502-AEZG
• Manufacturer: Standard Microsystems (SMSC)

Specifications of USB2502-AEZG

• Lead Free Status / RoHS Status: Compliant

Revision 2.3 (08-27-07)
Polarity strapping.
High-Speed USB
USB Transceiver
strapping option.
Port [2:1] Green
Over Current
USB Power
Removable
Port Power
Port Non-
Enable
NAME
Sense
Data
LED
Bias
&
NON_REM[1:0]
PRTPWR_POL
USBDN[2:1]
USBDP[2:1]
SYMBOL
PRTPWR
GR[2:1]/
OCS_N
RBIAS
Table 4.1 2-Port Hub Pin Descriptions (continued)
2-PORT USB 2.0 HUB INTERFACE
TYPE
IO-U
I/O8
I/O8
IPU
O8
I-R
DATASHEET
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 pin is determined by
the Power Polarity Strapping function of the PRTPWR_POL
pin.
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 the rising edge of RESET_N
(see the applicable RESET_N timing table in
to determine if ports [2:1] 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 are non-removable,
GR2 is active low,
GR1 is active low.
Port Power Polarity strapping determination for the active
signal polarity of the PRTPWR pin.
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 pin in order to ensure that
downstream port power is not inadvertently enabled to
inactive ports during a hardware reset.
On the rising edge of RESET_N (see the applicable
RESET_N timing table in
be latched internally, and will retain the active signal polarity
for the PRTPWR pin.
‘1’ = PRTPWR pin has an active ‘high’ polarity
‘0’ = PRTPWR pin has an active ‘low’ polarity
Input from external current monitor indicating an over-
current condition. {Note: Contains internal pull-up to 3.3V
supply}
A 12.0k Ω ( +/− 1%) resistor is attached from ground to this
pin to set the transceiver’s internal bias settings.
12
FUNCTION
Section
5.6.1), the logic value will
2-Port USB 2.0 Hub Controller
Section
SMSC USB2502
Datasheet
5.6.1)