USB2513 datasheet(19/63 Pages) MICROCHIP

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USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB251xB/xBi

Revision 2.2 (02-17-12)

DATASHEET

3.3

Pin Descriptions (Grouped by Function)

An N at the end of a signal name indicates that the active (asserted) state occurs when the signal is

at a low voltage level. When the N is not present, the signal is asserted when it is at a high voltage

level. The terms assertion and negation are used exclusively in order to avoid confusion when working

with a mixture of active low and active high signals. The term assert, or assertion, indicates that a

signal is active, independent of whether that level is represented by a high or low voltage. The term

negate, or negation, indicates that a signal is inactive.

Table 3.3 USB251xB/xBi Pin Descriptions

SYMBOL

BUFFER

TYPE

DESCRIPTION

UPSTREAM USB 2.0 INTERFACES

USBDM_UP

USBDP_UP

IO-U

USB Data: connect to the upstream USB bus data signals (host, port, or

upstream hub).

VBUS_DET

Detect Upstream VBUS Power: detects the state of the upstream VBUS power.

The SMSC hub monitors VBUS_DET to determine when to assert the internal

D+ pull-up resistor: (signaling a connect event).

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

upstream port via a 2:1 voltage divider. Two 100 k

Ω resistors are suggested.

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

connected to a dedicated host control output, or connected to the 3.3 V domain

that powers the host (typically VDD33).

DOWNSTREAM USB 2.0 INTERFACES

USBDP_DN[x:1]/

PRT_DIS_P[x:1]

IO-U

Hi-Speed USB Data: connect to the downstream USB peripheral devices

attached to the hub’s port. To disable, use a 10 k

Ω pull-up resistor to 3.3 V.

USBDM_DN[x:1]/

PRT_DIS_M[x:1]

Downstream Port Disable Strap Option: when enabled by package and

configuration settings (see Table 5.1 on page 26), this pin is 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 for the

corresponding port number(s). See Section 3.3.1, on page 22 for pull up details.

PRTPWR[x:1]/

O12

USB Power Enable: enables power to USB peripheral devices downstream.

BC_EN[x:1]

IPD

Battery Charging Strap Option: when enabled by package and configuration

settings (see Table 5.1), the pin will be sampled at RESET_N negation to

determine if ports [x:1] support the battery charging protocol. When supporting

the battery charging protocol, the hub also supports external port power

controllers. The battery charging protocol enables a device to draw the currents

per the USB battery charging specification. See Section 3.3.1, on page 22 for

strap pin details.

1 : Battery charging feature is supported for port x

0 : Battery charging feature is not supported for port x

OCS_N[x:1]

IPU

Over-Current Sense: input from external current monitor indicating an over-

current condition.

RBIAS

I-R

USB Transceiver Bias: a 12.0 k

Ω (+/- 1%) resistor is attached from ground to

this pin to set the transceiver’s internal bias settings.

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