USB3503 datasheet(15/82 Pages) SMSC

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USB 2.0 HSIC High-Speed Hub Controller Optimized for Portable Applications

Datasheet

SMSC USB3503A

Revision 1.1 (02-07-13)

DATASHEET

Interrupt

INT_N

Interrupt

The function of this pin is determined by the setting

in the CFGP.INTSUSP configuration register.

When CFGP.INTSUSP = 0 (General Interrupt)

A transition from high to low identifies when one of

the interrupt enabled status registers has been

updated.

SOC must update the Serial Port Interrupt Status

When CFGP.INTSUSP = 1 (Suspend Interrupt)

Indicates USB state of the hub.

‘Asserted’ low = Unconfigured or configured and in

USB Suspend

‘Negated’ high = Hub is configured, and is active

(i.e., not in suspend)

If unused, this pin must be tied to VDD33_BYP.

Over Current Sense

OCS_N

Over Current Sense - Input from external current

monitor indicating an over-current condition on port

3 or on ganged supply.

Negated High = No over current fault detected

Asserted Low = Over Current Fault Reported

Port Power

PRTPWR

Port Power Control- Enables power to USB

peripheral devices downstream on port 3 or on

ganged supply.

Asserted High = External Device should provide

power for port(s).

Negated Low = External Device should disable

power to port(s).

MISC

Reference Clock Input

REFCLK

Reference clock input.

Reference Clock Select

REF_SEL[1:0]

The reference select input must be set to

correspond to the frequency applied to the

REFCLK input. The customer should tie these pins

to ground or VDD33_BYP. This input is latched

during HUB.Init stage.

Selects input reference clock frequency per

Table 3.3.

Table 3.1 Pin Descriptions (continued)

NAME

SYMBOL

TYPE

DESCRIPTION

USB3503 Datasheet(PDF) 15 Page - SMSC Corporation

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