Value

Operating conditions

NVM parameter

POWER_ONLY

_ABOVE_5V

Connection

stage

VBUS_VS_DISCH pin

Type-C state

0

0b

At attachment

5 V

(USB Type-C)

and

Attached.SNK

or

Debug Accessory.SNK

During operation

5 V

(USB Type-C

or SNK_PDO1)

and

0b or 1b

During operation

V(SNK_PDO2)

or V(SNK_PDO3)

and

Hi-Z

0b or 1b

Before

attachment

N.A.

N.A.

Unattached.SNK

1b

At attachment

5 V

(USB Type-C)

and

Attached.SNK

or

Debug Accessory.SNK

0b

and

AttachWait.SNK

0b

During operation

5 V

(USB Type-C

or SNK_PDO1)

or

Attached.SNK

or

Debug Accessory.SNK

0b or 1b

V(SNK_PDO2)

or V(SNK_PDO3)

or

Type-C state column refers to the Type-C FSM states as defined in the USB Type-C standard specification.

3.5

Dead battery mode

discharged and to start the battery charging process. This mode is also used in systems that are powered through

Dead battery mode operates only if the CC1DB and CC2DB pins are connected respectively to the CC1 and CC2

pins. Thanks to these connections, the STUSB4500 presents a pull-down termination on its CC pins and

advertises itself as a sink even if the device is not supplied.

When a source system connects to a USB Type-C port with the STUSB4500 configured in dead battery mode, it

VBUS_EN_SNK pin to allow the system to be powered.

STUSB4500

Dead battery mode

DS12499 - Rev 2

page 14/41