STUSB4500L datasheet(10/31 Pages) STMICROELECTRONICS

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The discharge time durations are also preset by default in the NVM (see Section 7.3 Electrical and timing

characteristics). The discharge time durations can be changed through NVM programming (see Section 5 Start-

up configuration).

The VBUS discharge feature is enabled by default in the NVM and can be disabled through NVM programming

(see Section 5 Start-up configuration).

3.2.3

VBUS power path assertion

The STUSB4500L can control the assertion of the VBUS power path from the USB Type-C receptacle, directly or

indirectly, through the VBUS_EN_SNK pin.

The table below summarizes the operating conditions that determine the electrical value of the VBUS_EN_SNK

pin during system operation.

Table 7. VBUS_EN_SNK pin behavior depending on the operating conditions

Value

Operating conditions

Connection stage

VBUS monitoring conditions on VBUS_VS_DISCH pin

At attachment or during operation

VBUS < VMONUSBH

and

VBUS > VTHUSB

Hi-Z

At detachment or during ErrorRecovery

VBUS > VMONUSBH

VBUS < VTHUSB

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

3.3

Dead battery mode

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

discharged and therefore to start the battery charging process without any external support. 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 STUSB4500L 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, it detects the pull-down termination, establish the source-

to-sink connection, and provide the VBUS. The STUSB4500L is then supplied thanks to the VDD pin connected to

VBUS on the USB Type-C receptacle side. The STUSB4500L can finalize the connection and enable the power

path on VBUS thanks to the VBUS_EN_SNK pin to allow the system to be powered.

3.4

High voltage protections

The STUSB4500L can be safely used in systems or connected to systems that handle high voltage on the VBUS

power path. The device integrates an internal circuitry on the CC pins that tolerates high voltage and ensures

protection up to 22 V in case of unexpected short-circuits with the VBUS or in case of a connection to a device

supplying high voltage on the VBUS.

3.5

Hardware fault management

During system operation, the STUSB4500L handles some pre-identified hardware fault conditions. When such

conditions happen, the circuit goes into an ErrorRecovery state as defined in the USB Type-C standard

specifications.

STUSB4500L

Dead battery mode

DS13102 - Rev 1

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