USB2514Bi-AEZG datasheet(12/57 Pages) MICROCHIP

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USB251xB/xBi

DS00001692C-page 12

 2010 - 2015 Microchip Technology Inc.

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 nega-

tion 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 3-2:

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 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

 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]/P

RT_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

 pull-up resistor to 3.3 V.

USBDM_DN[x:1]/P

RT_DIS_M[x:1]

Downstream Port Disable Strap Option: when enabled by package and

configuration settings (see Table 5-1 on page 19), 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 14 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 14 for strap pin details.

: Battery charging feature is supported for port x

: 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

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

pin to set the transceiver’s internal bias settings.

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