USB3503 datasheet(11/73 Pages) MICROCHIP

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 2011-2015 Microchip Technology Inc.

DS00001584B-page 11

USB3503

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.

RESET Input

RESET_N

This active low signal is used by the system to

reset the chip and hold the chip in low power

STANDBY MODE.

USB Transceiver Bias

RBIAS

A-I/O

A 12.0k

Ω (+/- 1%) resistor is attached from ground

to this pin to set the transceiver’s internal bias

settings.

Hub Connect

HUB_CONNECT

Hub will transition to the Hub Communication

Stage when this pin is asserted high. It can be

used in three different ways:

Tied to Ground - Hub will not transition to the Hub

Communication Stage until connect_n bit of the

SP_ILOCK register is negated.

Tied to VDD33_BYP - Hub will automatically

transition to the Hub Communication Stage

regardless of the setting of the connect_n bit and

without pausing for the SOC to reference status

registers.

Transition from low to high - Hub will transition to

the Hub Communication Stage after this pin

transitions from low to high. HUB_CONNECT

should never be driven high when USB3503 is in

Standby Mode.

TABLE 3-1:

PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Type

Description

USB3503 数据表(PDF) 11 Page - Microchip Technology

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