USB4604 datasheet(18/71 Pages) SMSC

18 / 71 page

USB 2.0 HSIC Hi-Speed 4-Port Hub Controller

Datasheet

Revision 1.0 (06-17-13)

SMSC USB4604

DATASHEET

Port 3 Power

Output

PRTPWR3

Enables power to a downstream USB device

attached to Port 3.

0 = Power disabled on downstream Port 3

1 = Power enabled on downstream Port 3

Port 3 Control

PRTCTL3

OD8/IS

(PU)

When configured as PRTCTL3, this pin functions

as both the Port 3 power enable output

(PRTPWR3) and the Port 3 over-current sense

input (OCS3_N). Refer to the PRTPWR3 and

OCS3_N descriptions for additional information.

Port 4 Power

Output

PRTPWR4

Enables power to a downstream USB device

attached to Port 4.

0 = Power disabled on downstream Port 4

1 = Power enabled on downstream Port 4

Port 4 Control

PRTCTL4

OD8/IS

(PU)

When configured as PRTCTL4, this pin functions

as both the Port 4 power enable output

(PRTPWR4) and the Port 4 over-current sense

input (OCS4_N). Refer to the PRTPWR4 and

OCS4_N descriptions for additional information.

No Connect

These pins must be left floating for normal device

operation.

POWER

Battery

Power Supply

Input

VBAT

Battery power supply input. When VBAT is

connected directly to a +3.3V supply from the

system, the internal +3.3V regulator runs in

dropout and regulator power consumption is

eliminated. A 4.7

μF (<1

Ω ESR) capacitor to

ground is required for regulator stability. The

capacitor should be placed as close as possible

to the device. Refer to Chapter 4, "Power

Connections," on page 22 for power connection

information.

+3.3V Analog

Power Supply

VDDA33

+3.3V analog power supply. A 1.0

μF (<1

Ω ESR)

capacitor to ground is required for regulator

stability. The capacitor should be placed as close

as possible to the device. Refer to Chapter 4,

"Power Connections," on page 22 for power

connection information.

+3.3V Power

Supply

VDD33

+3.3V power supply. These pins must be

connected to VDDA33. Refer to Chapter 4,

"Power Connections," on page 22 for power

connection information.

Table 3.1 Pin Descriptions (continued)

NUM PINS

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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