STUSB4500QTR datasheet(6/41 Pages) STMICROELECTRONICS

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2.2.4

I²C interface pins

Table 3. I2C interface pin list

Name

Description

SCL

I²C clock, need external pull-up

SDA

I²C data, need external pull-up

ALERT

I²C interrupt, need external pull-up

ADDR0, ADDR1

I²C device address bits (see Section 4 I²C Interface)

Warning: ADDR0 and ADDR1 pins must be connected to ground when there is no connection to an MCU.

2.2.5

DISCH

This input/output pin can be used to implement a discharge path for highly capacitive VBUS line on power system

side.

When used as input, the discharge is internal and a serial resistor must connected to the pin to limit the discharge

current through the pin. Maximum discharge current is 500 mA.

The pin can be also used as an open drain output to control an external VBUS discharge path when higher

discharge current is required by the application, for instance.

The pin is activated at the same time as the internal discharge path on VBUS_VS_DISCH pin. The discharge is

activated automatically during cable disconnection, transition to a lower PDO voltage, hard reset and error

recovery state. The discharge time is programmable by NVM (see Section 5 Start-up configuration).

2.2.6

GND

Ground.

2.2.7

ATTACH

This pin is asserted when a valid source-to-sink connection is established. It is also asserted when a connection

to a debug accessory device is detected.

STUSB4500

Pin description

DS12499 - Rev 2

page 6/41

STUSB4500QTR Folha de dados(PDF) 6 Page - STMicroelectronics