USB4604 datasheet(17/71 Pages) SMSC

17 / 71 page

USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

SMSC USB4604

Revision 1.0 (06-17-13)

DATASHEET

Suspend

Output

SUSPEND

This signal is used to indicate that the entire hub

has entered the USB suspend state and that

VBUS current consumption should be reduced in

accordance with the USB specification. Refer to

Section 8.6, "Suspend (SUSPEND)," on page 57

for additional information.

Note:

SUSPEND must be enabled via the

Protouch configuration tool.

SOF

Synchronized

8KHz Clock

Output

SOF

This signal outputs an 8KHz clock synchronized

with the USB Host SOF.

Note:

SOF output is controlled via the

SOF_ENABLE bit in the

UTIL_CONFIG1 register

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.

Port 1 Power

Output

PRTPWR1

Enables power to a downstream USB device

attached to Port 1.

0 = Power disabled on downstream Port 1

1 = Power enabled on downstream Port 1

Port 1 Control

PRTCTL1

OD8/IS

(PU)

When configured as PRTCTL1, this pin functions

as both the Port 1 power enable output

(PRTPWR1) and the Port 1 over-current sense

input (OCS1_N). Refer to the PRTPWR1 and

OCS1_N descriptions for additional information.

Port 2 Power

Output

PRTPWR2

Enables power to a downstream USB device

attached to Port 2.

0 = Power disabled on downstream Port 2

1 = Power enabled on downstream Port 2

Port 2 Control

PRTCTL2

OD8/IS

(PU)

When configured as PRTCTL2, this pin functions

as both the Port 2 power enable output

(PRTPWR2) and the Port 2 over-current sense

input (OCS2_N). Refer to the PRTPWR2 and

OCS2_N descriptions for additional information.

Table 3.1 Pin Descriptions (continued)

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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