USB4624 datasheet(14/68 Pages) SMSC

14 / 68 page

USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

Revision 1.0 (06-17-13)

SMSC USB4624

DATASHEET

I2C Serial

Data

SDA

IS/OD8

I2C bidirectional serial data

SMBus Serial

Data

SMBDATA

IS/OD8

SMBus bidirectional serial data

SPI MASTER INTERFACE

SPI Chip

Enable

Output

SPI_CE_N

O12

Active-low SPI chip enable output.

Note:

If the SPI is enabled, this pin will be

driven high in powerdown states.

SPI Clock

Output

SPI_CLK

O12

SPI clock output

SPI Data

Output

SPI_DO

O12

SPI data output

SPI Speed

Select

Configuration

Strap

SPI_SPD_SEL

(PD)

This strap is used to select the speed of the SPI.

0 = 30MHz (default)

1 = 60MHz

Note:

If the latched value on reset is 1, this pin

is tri-stated when the chip is in the

suspend state. If the latched value on

reset is 0, this pin is driven low during a

suspend state.

See Note 3.3 for more information on

configuration straps.

SPI Data

Input

SPI_DI

(PD)

SPI data input

MISC.

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.

Table 3.1 Pin Descriptions (continued)

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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