STUSB4500 datasheet(14/41 Pages) STMICROELECTRONICS

14 / 41 page

Table 10. VBUS_EN_SNK pin behavior depending on the operating conditions

Value

Operating conditions

NVM parameter

POWER_ONLY

_ABOVE_5V

Connection

stage

VBUS voltage from source

VBUS monitoring conditions on

VBUS_VS_DISCH pin

Type-C state

At attachment

5 V

(USB Type-C)

VBUS < VMONUSBH1

and

VBUS > VMONUSBL1

Attached.SNK

Debug Accessory.SNK

During operation

5 V

(USB Type-C

or SNK_PDO1)

VBUS < VMONUSBH1

and

VBUS > VTHUSB

0b or 1b

During operation

V(SNK_PDO2)

or V(SNK_PDO3)

VBUS < VMONUSBH2/3

and

VBUS > VMONUSBL2/3

Hi-Z

0b or 1b

Before

attachment

N.A.

Unattached.SNK

At attachment

5 V

(USB Type-C)

VBUS < VMONUSBH1

and

VBUS > VMONUSBL1

Attached.SNK

Debug Accessory.SNK

VBUS > VMONUSBH1

and

VBUS < VMONUSBL1

AttachWait.SNK

During operation

5 V

(USB Type-C

or SNK_PDO1)

VBUS > VMONUSBH1

VBUS < VTHUSB

Attached.SNK

Debug Accessory.SNK

0b or 1b

V(SNK_PDO2)

or V(SNK_PDO3)

VBUS > VMONUSBH2/3

VBUS < VMONUSBL2/3

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

Dead battery mode allows systems powered by a battery to be supplied by the VBUS when the battery is

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

the VBUS only.

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

can detect the pull-down termination, establish the source-to-sink connection, and provide the VBUS. The

STUSB4500 is then supplied thanks to the VDD pin connected to VBUS on the USB Type-C receptacle side. The

STUSB4500 can finalize the connection on its side and enable the power path on VBUS thanks to the

VBUS_EN_SNK pin to allow the system to be powered.

STUSB4500

Dead battery mode

DS12499 - Rev 2

page 14/41

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