Справочник Пользователя для SMSC USB2513B

USB 2.0 Hi-Speed Hub Controller

Revision 1.0 (3-11-09)

22

SMSC USB251x

USBDM_UP

USBDP_UP

IO-U

USB Data

These pins connect to the upstream USB bus data signals (host, port, or 

upstream hub).

VBUS_DET

I/O12

Detect Upstream VBUS Power

Detects state of Upstream VBUS power. The SMSC hub monitors 

VBUS_DET to determine when to assert the internal D+ pull-up resistor which 

signals a connect event.

When designing a detachable hub, this pin should be connected to VBUS on 

the upstream port via a 2 to 1 voltage divider.

For self-powered applications with a permanently attached host, this pin must 

be connected to 3.3 V (typically VDD33).

USBDP_DN[x:1]/

PRT_DIS_P[x:1]

IO-U

Hi-Speed USB Data

These pins connect to the downstream USB peripheral devices attached to 

the hub’s port. To disable, pull up with a 10 K resistor to 3.3 V.

USBDM_DN[x:1]/ 

PRT_DIS_M[x:1]

Downstream Port Disable Strap Option

If this strap is enabled by package and configuration settings (see 

), then this pin will be sampled at RESET_N 

negation to determine if the port is disabled.

To disable a port, pull up both PRT_DIS_M[x:1] and PRT_DIS_P[x:1] pins 

corresponding to the port numbers.

PRTPWR[x:1] /

BC_EN[x]

O12

USB Power Enable

Enables power to USB peripheral devices downstream. 

When PRTPWR_POL pin is unavailable, the hub supports active high power 

controllers only.

When PRTPWR_POL pin is available, the active signal level of the PRTPWR 

pins is determined by the power polarity strapping function of the 

PRTPWR_POL pin.

IPD

Battery Charging Strap Option 

*This feature is only available on USB251xB/Bi.

If this strap is enabled by package and configuration settings, (see 

), this pin will be sampled at RESET_N negation 

to determine if ports [x:1] support the battery charging protocol (and thus the 

supporting external port power controllers) that would enable a device to draw 

the currents per the USB battery charging specification.

BC_EN[x] = 1: Battery charging feature is supported for port x

BC_EN[x] = 0: Battery charging feature is not supported for 

port x