USB2524 SMSC Corporation, USB2524 Datasheet - Page 13

• Manufacturer Part Number: USB2524
• Description: USB MultiSwitch Hub
• Manufacturer: SMSC Corporation

USB MultiSwitch
Datasheet
Chapter 5 Switching Hub Pin Descriptions
SMSC USB2524
Detect Upstream
High-Speed USB
strapping option
Port 4:3 Green
USB Bus Data
VBUS Power
Port Disable
USB Power
Enable
NAME
Data
LED
&
TM
Hub
USBDN_DM[4:1]
USBUP_DM[2:1]
USBDN_DP[4:1]
USBUP_DP[2:1]
VBUS_DET[2:1]
LED_A[4:3]_N/
PRTPWR[4:1]
PRT_DIS[1:0]
SYMBOL
Table 5.1 Switching Hub Pin Descriptions
4-PORT USB2.0 HUB INTERFACE
UPSTREAM USB2.0 INTERFACE
TYPE
I/O12
IO-U
IO-U
I/O
O
DATASHEET
These pins connect to the upstream USB bus data signals.
Detects state of Upstream VBUS power. The SMSC Hub
monitors VBUS_DET to determine when to assert the
internal D+ pull-up resistor (signalling a connect event).
When designing a detachable hub, this pin must be
connected to the VBUS power pin of the USB port that is
upstream of the hub. (Use of a weak pull-down resistor is
recommended.)
For self-powered applications with a permanently attached
host, this pin must be pulled-up to either 3.3V or 5.0V
(typically VDD33).
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[4] pin is determined
by the Power Polarity Strapping function of the
PRTPWR_POL pin.
Green indicator LED for ports 4 and 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 ports [4:2] will be permanently disabled. Also,
the active state of the LED's will be determined as follows:
PRT_DIS[1:0] = '00', All ports are enabled,
LED_A4_N is active high,
LED_A3_N is active high.
PRT_DIS[1:0] = '01', Port 4 is disabled,
LED_A4_N is active high,
LED_A3_N is active low.
PRT_DIS[1:0] = '10', Ports 4 & 3 are disabled,
LED_A4_N is active low,
LED_A3_N is active high.
PRT_DIS[1:0] = '11', Ports 4, 3 & 2 are disabled,
LED_A4_N is active low,
LED_A3_N is active low.
13
FUNCTION
Revision 1.2 (07-17-06)