USB3803 datasheet(11/99 Pages) MICROCHIP

11 / 99 page

 2014-2015 Microchip Technology Inc.

DS00001691B-page 11

USB3803

HS USB Data

Bypass Port

USBDN_DP[3]

USBDN_DM[3]

A-I/O

When BYPASS_N is negated high, these pins connect

to the downstream USB peripheral devices attached

to the hub’s ports.

There is no downstream Port Disable Strap option on

these ports.

When BYPASS_N is asserted low, USBDN_DP[3] and

USBDN_DM[3] respectively are connected through

the analog switch to the upstream port USBUP_DP

and USBUP_DM. PortSwap setting has no effect in

Bypass Mode.

Note:

Bypass mode is only available in the

USB3803C.

For

the

USB3803B,

BYPASS_N must always be driven high.

Serial Port Interface

Serial Data

SDA

I/OD

I2C Serial Data

Serial Clock

SCL

Serial Clock (SCL)

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 Reg-

ister to reset the interrupt pin high.

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)

The Suspend Interrupt can be used by the system to

determine whether the full current based on the USB

descriptor can be drawn on VBUS or whether a

reduced current should be drawn in accordance with

the USB specification for unconfigured or suspend

mode.

If unused, this pin must be tied to VDD33_BYP.

TABLE 3-1:

PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Type

Description

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