USB3803 datasheet(12/99 Pages) MICROCHIP

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USB3803

DS00001691B-page 12

 2014-2015 Microchip Technology Inc.

Serial Address Select

I2C_ASEL[1:0]

Address Select – the USB3803 has the ability to be

programmed with four different I2C slave addresses

as part of the configuration in order to provide flexibil-

ity. When sharing the serial bus in the system with

another part that conflicts with one of the address set-

tings, these pins may be used to change the selection

to a non-conflicting I2C address. The customer should

tie these pins to ground or VDD33_BYP. This input is

latched during HUB.Init stage.

I2C_ASEL[1] selects between the I2C addresses

defined in registers I2CADD0 and I2CADD1.

I2C_ASEL[0] determines the LSB of the I2C address.

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 USB3803 is in Standby Mode.

Power

1.2V VDD Power

VDD12_BYP

Power

1.2 V Regulator. A 1.0

μF (<1

Ω ESR) capacitor to

ground is required for regulator stability. The capaci-

tor should be placed as close as possible to the

USB3803.

TABLE 3-1:

PIN DESCRIPTIONS (CONTINUED)

Name

Symbol

Type

Description

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