2.2.9

GPIO

This pin is an active low open drain output that can be configured by NVM as per table below (see Section

5 Start-up configuration).

NVM parameter

GPIO_CFG[1:0]

Pin name

Pin function

Value

Description

00b

SW_CTRL_GPIO

Software controlled GPIO.

The output state is defined by

at address 2Dh

Hi-Z

When bit #0 value is 0b (at start-up)

0

When bit #0 value is 1b

01b

ERROR_RECOVERY

Hardware fault detection

(see Section 3.5 Hardware

fault management)

Hi-Z

No hardware fault detected

0

Hardware fault detected

10b

DEBUG

Debug accessory detection

(see Section 3.6 Debug

accessory mode detection)

Hi-Z

No debug accessory detected

0

Debug accessory detected

11b

(default)

SINK_POWER

Indicates USB Type-C current

capability advertised by the

source

Hi-Z

Source supplies default or 1.5 A USB

Type-C current at 5 V

0

Source supplies 3.0 A USB Type-C

current at 5 V

2.2.10

VBUS_EN_SNK

connected according to different operating conditions stated in the table below. VBUS_EN_SNK pin is a high

voltage open drain output that allows a PMOS transistor to be directly driven to enable the VBUS power path.

2.2.11

A_B_SIDE

This output pin provides the cable orientation. It is used to establish USB SuperSpeed signal routing. This signal

is not required in case of USB 2.0 support.

Value

Description

HiZ

CC1 pin is attached to CC line

0

CC2 pin is attached to CC line

2.2.12

VBUS_VS_DISCH

receptacle side.

A serial resistor connected to the pin must be used to limit the discharge current through the pin. Maximum

discharge current is 50 mA.

The discharge is activated automatically during cable disconnection, and error recovery state. The discharge time

is programmable by NVM (see Section 5 Start-up configuration).

2.2.13

VREG_1V2

This pin is used only for external decoupling of the 1.2 V internal regulator. The recommended decoupling

capacitor is: 1 µF typ. (0.5 µF min., 10 µF max.)

2.2.14

VSYS

This is the low power supply from the system, if there is any. It can be connected directly to a single cell Lithium

battery or to the system power supply delivering 3.3 V up to 5 V. It is recommended to connect the pin to ground

when it is not used.

STUSB4500L

Pin description

DS13102 - Rev 1

page 7/31