FUSB302BVMPX datasheet(6/32 Pages) ONSEMI

6 / 32 page

FUSB302B

www.onsemi.com

CONFIGURATION CHANNEL SWITCH

The FUSB302B integrates the control and detection

functionality required to implement a USB Type-C host,

device or dual-role port including:

• Device Port Pull-Down (RD)

• Host Port Pull-Up (IP)

• 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 6.

Figure 6. Configuration Channel Switch Functionality

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

TYPE-C DETECTION

The FUSB302B 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 FUSB302B 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 FUSB302B 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

Detection through Autonomous Device Toggle

The FUSB302B has the capability to do autonomous DRP

toggle. In autonomous toggle the FUSB302B 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.

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