•

When a new PDO is negotiated upon source request, the active POWER_OK pin is disabled (Hi-Z) when the

STUSB4500 sends an RDO (request data object) message to the source with the new negotiated PDO

•

At detachment the POWER_OK pins remain enabled (if already asserted), whereas VBUS_EN_SNK is

state is reinitialized (Hi-Z) after new attachment or after a reset

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

(default)

ERROR_RECOVERY

Hardware fault detection

(see Section 3.7 Hardware

fault management)

Hi-Z

No hardware fault detected

0

Hardware fault detected

10b

DEBUG

Debug accessory detection

(see Section 3.8 Debug

accessory mode detection)

Hi-Z

No debug accessory detected

0

Debug accessory detected

11b

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. The default behavior of the pin

can be changed by NVM programming (see Section 5 Start-up configuration).

NVM parameter

POWER_ONLY

_ABOVE_5V

Pin function

Value

Description

Comment

0b

(default)

when source attached

any PDO voltage)

Hi-Z

No source attached

Valid for all

POWER_OK pin

configurations 1, 2

and 3

0

Source attached

1b

when source attached and

PDO2 or PDO3 voltage

Hi-Z

No source attached or no PD explicit

contract with PDO2 or PDO3

0

Source attached and PD explicit

contract with PDO2 or PDO3

When POWER_ONLY_ABOVE_5V bit is set to logic level high, the VBUS_EN_SNK pin is asserted only when a

PDO2 or PDO3 explicit contract is established with the source (see Section 3.3 Auto-run mode).

STUSB4500

Pin description

DS12499 - Rev 2

page 8/41