USB2532 datasheet(14/50 Pages) MICROCHIP

14 / 50 page

USB 2.0 Hi-Speed 2-Port Hub Controller

Datasheet

DS00001701A-page 14

 2014 Microchip Technology Inc.

System Reset

Input

RESET_N

I_RST

This active-low signal allows external hardware to

reset the device.

Note:

The active-low pulse must be at least

5us wide. Refer to Section 8.3.2,

"External Chip Reset (RESET_N)," on

page 35 for additional information.

Crystal Input

XTAL1

ICLK

External 24 MHz crystal input

Reference

Clock Input

REFCLK

ICLK

Reference clock input. The device may be

alternatively driven by a single-ended clock

oscillator. When this method is used, XTAL2

should be left unconnected.

Crystal

Output

XTAL2

OCLK

External 24 MHz crystal output

External USB

Transceiver

Bias Resistor

RBIAS

A 12.0k

Ω (+/- 1%) resistor is attached from

ground to this pin to set the transceiver’s internal

bias settings.

LED 0 Output

LED0

General purpose LED 0 output that is

configurable to blink or “breathe” at various rates.

Note:

LED0 must be enabled via the Protouch

configuration tool.

Detect

Upstream

VBUS Power

VBUS_DET

Detects state of upstream bus power.

When designing a detachable hub, this pin must

be connected to the VBUS power pin of the

upstream USB port through a resistor divider

(50k

Ω by 100kΩ) to provide 3.3V.

For self-powered applications with a permanently

attached host, this pin must be connected to

either 3.3V or 5.0V through a resistor divider to

provide 3.3V.

In embedded applications, VBUS_DET may be

controlled (toggled) when the host desires to

renegotiate a connection without requiring a full

reset of the device.

Table 3.1 Pin Descriptions (continued)

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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