STUSB1602 Datasheet, PDF (20/55 Pages) STMicroelectronics – Power hubs and docking stations

Features description
STUSB1602
3.6
Dead battery mode
Dead battery mode allows systems powered by a battery to be supplied by the V_BUS when
the battery is discharged and to start the battery charging process. This mode is also used
in systems that are powered through the V_BUS 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 V_BUS. The STUSB1602 is then supplied thanks to the VDD pin
connected to the V_BUS on the USB Type-C receptacle side. The STUSB1602 can finalize
the source-to-sink connection and enable the power path on the V_BUS 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 V_BUS 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 V_BUS or in the case of a connection to a device supplying high voltage on
the V_BUS.
3.8
Hardware fault management
The STUSB1602 handles hardware fault conditions related to the device itself and to the
V_BUS 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
V_BUS 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 V_BUS 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.
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DocID028319 Rev 2