•

Undervoltage and overvoltage protections

•

Reverse current and reverse voltage protections

Figure 4. VCONN to CC1 and CC2 power switch protections

Current limit programming

The current limit can be set within the range 100 mA to 600 mA by a step of 50 mA. The default current limit is

programmed through NVM programming (see Section 6 Start-up configuration) and can be changed by software

through the I²C interface. At power-on or after a reset, the current limit takes the default value preset in the NVM.

Fault management

The table below summarizes the different fault conditions that could occur during switch operation and the

associated responses. An I²C alert is generated when a fault condition happens.

Table 6. Fault management conditions

Fault types

Fault conditions

Expected actions

Short-circuit

CC output pin shorted to ground via

very low resistive path causing rapid

current surge

Power switch limits the current and reduces the output voltage. I²C

alert is asserted immediately thanks to VCONN_SW_OCP_FAULT

bits

Overcurrent

CC output pin connected to a load

that sinks current above programmed

limit

Power switch limits the current and reduces the output voltage. I²C

alert is asserted immediately thanks to VCONN_SW_OCP_FAULT

bits

Overheating

Junction temperature exceeding 145

°C due to any reason

Power switch is disabled immediately until the temperature falls

below 145 °C minus hysteresis of 15 °C. I²C alert is asserted

immediately thanks to THERMAL_FAULT bit. The STUSB1702 goes

into transient error recovery state

Undervoltage

VCONN input voltage drops below

UVLO threshold minus hysteresis

Power switch is disabled immediately until the input voltage rises

above the UVLO threshold. I²C alert is asserted immediately thanks

to VCONN_PRESENCE bit

Overvoltage

CC output pin voltage exceeds

maximum operating limit of 6.0 V

Power switch is opened immediately until the voltage falls below the

voltage limit. I²C alert is asserted immediately thanks to

VCONN_SW_OVP_FAULT bits

STUSB1702

VCONN supply

DS12664 - Rev 1

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