STUSB1602 datasheet(20/55 Pages) STMICROELECTRONICS

20 / 55 page

Features description

STUSB1602

20/55

DocID028319 Rev 2

3.6

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 is only supported in sink power role and dual power role configurations.

It operates only if the CC1DB and CC2DB pins are connected respectively to the CC1 and

CC2 pins. Thanks to these connections, the STUSB1602 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 STUSB1602 configured in

dead battery mode, it can detect the pull down termination, establish the source-to-sink

connection, and provide the VBUS. The STUSB1602 is then supplied thanks to the VDD pin

connected to the VBUS on the USB Type-C receptacle side. The STUSB1602 can finalize

the source-to-sink connection and enable the power path on the VBUS thanks to the

VBUS_EN_SNK pin which allows the system to be powered.

3.7

High voltage protection

The STUSB1602 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 voltages and ensures protection up to 22 V in case of unexpected short

circuits with the VBUS or in the case of a connection to a device supplying high voltage on

the VBUS.

3.8

Hardware fault management

The STUSB1602 handles hardware fault conditions related to the device itself and to the

VBUS power path during system operation.

When such conditions occur, the circuit goes into a transient error recovery state named

ErrorRecovery in the Type-C FSM. When entering in this state, the device de-asserts the

VBUS power path by disabling the VBUS_EN_SRC pin and it removes the terminations from

the CC pins during several tens of milliseconds. Then, it transitions to the unattached source

state.

The STUSB1602 goes into error recovery state when at least one condition listed below is

met:

•

If an overtemperature is detected, the “THERMAL_FAULT” flag is asserted

•

If an internal pull-up voltage on the CC pins is below the UVLO threshold, the

“VPU_VALID” flag is asserted.

•

If an overvoltage is detected on the CC pins, the “VPU_OVP_FAULT” flag is asserted

•

If the VBUS voltage is out of the valid voltage range during attachment, the

“VBUS_VALID” flag is asserted.

•

If an undervoltage is detected on the VDD pin during attachment when UVLO detection

is enabled, the “VDD_UVLO_DISABLE” flag is asserted.

•

If an overvoltage is detected on the VDD pin during attachment when OVLO detection

is enabled, the “VDD_OVLO_DISABLE” flag is asserted.

STUSB1602 데이터시트(PDF) 20 Page - STMicroelectronics

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