FUSB308B datasheet(5/53 Pages) ONSEMI

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FUSB308B

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Pin Descriptions

Table 2. PIN DESCRIPTION

Name

Type

Description

USB TYPE−C CONNECTOR INTERFACE

CC1

I/O

Type−C connector Configuration Channel (CC) pins. Initially used to determine

when an attach has occurred and what the orientation of the insertion is. Function-

ality after attach depends on mode of operation detected.

Operating as a host:

− Sets the allowable charging current for VBUS to be sensed by the attached

device

− Used to communicate with devices using USB BMC Power Delivery

− Used to detect when a detach has occurred

Operating as a device:

− Indicates what the allowable sink current is from the attached host

− Used to communicate with devices using USB BMC Power Delivery

CC2

I/O

GND

Ground

VBUS

Power

VBUS supply pin for attach and detach detection when operating as an upstream

facing port (Device)

POWER INTERFACE

VDD

Power

Input supply voltage

GPIO2

3−State CMOS I/O

General Purpose I/O

VCONN

Power Switch

Regulated input to be switched to correct CC pin as VCONN to power USB3.1

fully featured cables, powered accessories or dongles bridging Type C to other

video or audio connectors

SIGNAL INTERFACE

SCL1/SDA2 (Note 1)

Open−Drain I/O

I2C serial clock/data signal to be connected to the I2C master

SDA1/SCL2 (Note 1)

Open−Drain I/O

I2C serial clock/data signal to be connected to the I2C master

INT_N

Open−Drain Output

Active LOW open drain interrupt output used to prompt the processor to read the

I2C register bits

ORIENT/I2C_

ADDR (Note 1)

3−State CMOS Output

Selects I2C Address on Power up and then becomes a General Purpose CMOS

Output

MUX_SEL0

3−State CMOS Output

MUX Selection Output 0

MUX_SEL1

3−State CMOS I/O

MUX Selection Output 1

GPIO1

3−State CMOS I/O

General Purpose I/O

VBUS SOURCE INTERFACE

SRC_HV

CMOS Output

Controls High Voltage Source Path Load Switch (Active High)

SRC

CMOS Output

Controls external VBUS Source Load Switch on/off. (Active High)

1. A different I2C address is used depending on which SDA and SCL are used and the state of ORIENT/I2C_ADDR at power up.

Power Up, Initialization and Reset

When power is first applied to VDD or VBUS, the

FUSB308B goes through its POR sequence to load up all the

default values in the register map, read all the fuses so that

the trimmed values are available when VDD or VBUS is in

its valid range. A software reset can be executed by writing

SW_RES to 1 in RESET Register.

This executes a full reset of the FUSB308B similar to POR

where all the I2C registers go to their default state.

When powered down, the FUSB308B will present an

Open on both CC lines.

The FUSB308B will present Rp, ROLECTRL= 0x05

when VDD is present

Programmable GPIOx

The FUSB308B has two programmable GPIOs. These

can be programmed to be Inputs, CMOS Outputs or Open

Drain Outputs. To configure them, the TCPM writes to

GPIO1_CFG and GPIO2_CFG. If the GPIO is configured as

an input, its logic value can be read in GPIO_STAT and

ALERT_VD registers.

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