USB2524 datasheet(13/57 Pages) SMSC

13 / 57 page

USB MultiSwitchTM Hub

Datasheet

SMSC USB2524

Revision 1.2 (07-17-06)

DATASHEET

Chapter 5 Switching Hub Pin Descriptions

Table 5.1 Switching Hub Pin Descriptions

NAME

SYMBOL

TYPE

FUNCTION

UPSTREAM USB2.0 INTERFACE

USB Bus Data

USBUP_DP[2:1]

USBUP_DM[2:1]

IO-U

These pins connect to the upstream USB bus data signals.

Detect Upstream

VBUS Power

VBUS_DET[2:1]

I/O

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).

4-PORT USB2.0 HUB INTERFACE

High-Speed USB

Data

USBDN_DP[4:1]

USBDN_DM[4:1]

IO-U

These pins connect to the downstream USB peripheral

devices attached to the Hub’s ports.

USB Power

Enable

PRTPWR[4:1]

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.

Port 4:3 Green

LED

Port Disable

strapping option

LED_A[4:3]_N/

PRT_DIS[1:0]

I/O12

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.

USB2524 датащи(PDF) 13 Page - SMSC Corporation

USB2524 датащи(HTML) 13 Page - SMSC Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57

датащи скачать

ссылки URL