USB4604 datasheet(17/62 Pages) MICROCHIP

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USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

 2014 Microchip Technology Inc.

DS00001716A-page 17

MISC.

Port 1 Over-

Current

Sense Input

OCS1_N

(PU)

This active-low signal is input from an external

current monitor to indicate an over-current

condition on USB Port 1.

Port 2 Over-

Current

Sense Input

OCS2_N

(PU)

This active-low signal is input from an external

current monitor to indicate an over-current

condition on USB Port 2.

UART

Receive Input

UART_RX

Internal UART receive input

Note:

This is a 3.3V signal. For RS232

operation, an external 12V translator is

required.

Port 3 Over-

Current

Sense Input

OCS3_N

(PU)

This active-low signal is input from an external

current monitor to indicate an over-current

condition on USB Port 3.

UART

Transmit

Output

UART_TX

Internal UART transmit output

Note:

This is a 3.3V signal. For RS232

operation, an external 12V driver is

required.

Port 4 Over-

Current

Sense Input

OCS4_N

(PU)

This active-low signal is input from an external

current monitor to indicate an over-current

condition on USB Port 4.

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 8.4.2,

"External Chip Reset (RESET_N)," on

page 46 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.

Table 3.1 Pin Descriptions (continued)

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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