FUSB302TMPX datasheet(5/36 Pages) ONSEMI

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Configuration Channel Switch

The FUSB302T integrates the control and detection

functionality required to implement a USB Type-C host,

device or dual-role port including:

 Device Port Pull-Down(R

 Host Port Pull-Up (I

 VCONN Power Switch with OCP for Full-Featured

USB3.1 Cables

 USB BMC Power Delivery Physical Layer

 Configuration Channel (CC) Threshold

Comparators.

Each CC pin contains a flexible switch matrix that allows

the host software to control what type of Type-C port is

implemented. The switches are shown in Figure 5.

Figure 5.

Configuration Channel Switch Functionality

Type-C Detection

The FUSB302T implements multiple comparators and a

programmable DAC that can be used by software to

determine the state of the CC and VBUS pins. This status

information provides the processor all of the information

required to determine attach, detach and charging current

configuration of the Type-C port connection.

The FUSB302T has three fixed threshold comparators

that match the USB Type-C specification for the three

charging current levels that can be detected by a Type-

C device. These comparators automatically cause

BC_LVL and COMP interrupts to occur when there is a

change of state. In addition to the fixed threshold

comparators, the host software can use the 6-bit DAC to

determine the state of the CC lines more accurately.

The FUSB302T also has a fixed comparator that

monitors if VBUS has reached a valid threshold or not.

The DAC can be used to measure VBUS up to 20 V

which allows the software to confirm that changes to the

VBUS line have occurred as expected based on PD or

other communication methods to change the charging

level.

Default Float on CC

With or without VDD, The default CC status of

FUSB302T

float/open,

which

different

from

FUSB302B. The FUSB302T is suitable for charger

(wall) adaptor application which needs source only

mode and shouldn

‟t be seen as sink mode even with no

power on the device. The FUSB302T, however, can be

set to SINK mode, which has Rd (pull-down) on CCx by

software program.

Detection through Autonomous Device Toggle

The FUSB302T has the capability to do autonomous

DRP toggle. In autonomous toggle the FUSB302T

internally controls the PDWN1, PDWN2, PU_EN1 and

PU_EN2, MEAS_CC1 and MEAS_CC2 and implements

a fixed DRP toggle between presenting as a SRC and

presenting as a SNK. Alternately, it can present as a

SRC or SNK only and poll CC1 and CC2 continuously.

BMC

I/O

DAC/

Comparator

PWDNx

Reg

VCONN_CCx

Reg

Current

Source

Pull-ups

MEAS_CCx

Reg

TXCCx

Reg

PU_ENx

Reg

5.1K

VCONN_SWITCH

VCONN

MEAS_CC_SWITCH

TX_BMC_SWITCH

PULLUP_SWITCH

PULLDOWN_SWITCH

CCX

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