2.3

Pin description

2.3.1

CC1 / CC2

CC1 and CC2 are the configuration channel pins used for connection and attachment detection, plug orientation

determination and system configuration management across USB Type-C cable.

2.3.2

VCONN_VSYS

This power input is connected to a power source that can be a 5 V power supply or a lithium battery. It is used to

provide power to the local plug. It is internally connected to power switches that are protected against short-circuit

and overvoltage. This does not require any protection on the input side. When a valid source-to-sink connection is

determined and the VCONN power switches are enabled, VCONN is provided by the source to the unused CC pin

(see Section 3.2 VCONN supply) if power input is above 2.65 V. It is mandatory to supply this pin to allow overall

power above 60 W or any power profile with current above 3 A.

2.3.3

FAULT

FAULT signal is asserted when T3 temperature threshold is reached (see Section 3.4 Ambient temperature

adaptive power and protection). FAULT signal is de-asserted when one of the below re-start conditions is met:

1.

VDD goes below POR threshold

2.

Temperature decreases below T1

Note:

this re-start condition is valid once. In case some errors occur again, condition 1 only becomes valid, allowing T1

falling threshold output condition to be cleared/enabled again.

2.3.4

I²C interface

An IC interface can be used for non-volatile-memory customization (see Section 3.1 PDO customization)

Table 3. I2C interface pin list

Name

Description

SCL

I²C clock - need external pull-up

SDA

I²C data - need external pull-up

2.3.5

GND

Ground.

2.3.6

ISENSE_DISCH

Current sensing and VBUS discharge signal. The shunt resistor must be placed between VDD and

ISENSE_DISCH for the correct current measurement. This pin is used to discharge high capacitive VBUS line (on

system side). Discharge is enabled automatically during voltage down transitions, hard reset, error_recovery or

cable disconnection.

2.3.7

FB

IC internal feedback loop compensation pin.

2.3.8

OPTO_DRV

Control signal used to drive the optocoupler.

2.3.9

TSENSE

Temperature sensing input pin. To be connected to an NTC.

If ambient temperature adaptive power and overtemperature protection is not used, connect 1 kΩ pull-up resistor

to 1.2 V in order to disable temperature monitoring feature.

STUSB4761

Pin description

DS13141 - Rev 3

page 5/29