STUSB4700 datasheet(7/32 Pages) STMICROELECTRONICS

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STUSB4700

Inputs/outputs

DocID030193 Rev 2

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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. CC1/CC2 are HiZ during reset.

2.3.2

RESET

Active high reset. This pin resets all analog signals, states machine and reloads

configuration.

2.3.3

I2C interface pins

Table 4: I2C interface pins list

Name

Description

SCL

I²C clock

– need external pull-up

SDA

I²C data

– need external pull-up

ALERT#

I²C interrupt

– need external pull-up

2.3.4

A_B_SIDE

This output pin provides cable orientation. It is used to establish USB SuperSpeed signals

routing. The cable orientation is also provided by an internal I2C register. This signal is not

required in case of USB 2.0 support or in case of supply only.

Table 5: USB Data mux select

Value

CC pin position

HiZ

CC pin detected on CC1 (A5)

CC pin detected on CC2 (B5)

2.3.5

VBUS_SENSE

This input pin is used to sense VBUS presence, monitor VBUS voltage and discharge VBUS on

USB Type-C receptacle side.

2.3.6

VBUS_EN_SRC

In Source power role, this pin allows enabling of the outgoing VBUS power when the

connection to a Sink is established and VBUS is in the valid operating range. The open drain

output allows to drive directly a PMOS transistor. The logic value of the pin is also

advertised in a dedicated I2C register bit.

2.3.7

VSYS

VSYS is the low voltage power supply from the system (if any). VSYS connection is optional,

and can be connected directly to a single cell Lithium battery or a system power supply

delivering 3.3 V or 5 V. If not used, it is recommended to connect to GND.

2.3.8

VDD

VDD is the main power supply for applications powered by VBUS.

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