Fault types

Fault conditions

Expected actions

Reverse voltage

CC output pin voltage exceeds

0.35 V for 5 V when the power switch

is turned on

Power switch is opened immediately until the voltage difference falls

below the voltage limit. I²C alert is asserted immediately thanks to

VCONN_SW_RVP_FAULT bits

3.5

High voltage protection

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

3.6

Dead battery

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

Hardware fault management

system operation.

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

it removes the terminations from the CC pins during several tens of milliseconds. Then, it goes 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

The I²C register bits mentioned above give either the state of the hardware fault when it occurs or the setting

condition to detect the hardware fault.

STUSB1602

High voltage protection

DS11254 - Rev 5

page 14/39