TPS25751D datasheet(36/89 Pages) TI1

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8.3.3.3.1.2 VBUS UVLO

The TPS25751D monitors VBUS voltage and detects when it falls below VVBUS_UVLO. When the UVLO

condition is detected, GATE_VBUS is disabled within tPPHV_RCP. When the UVLO condition is cleared,

GATE_VBUS is reenabled within tPPHV_ON.

8.3.3.3.1.3 Discharging VBUS to Safe Voltage

The TPS25751S has an integrated active pulldown (IDSCH) on VBUS for discharging from high voltage to

VSAFE0V (0.8 V). This discharge is applied when it is in an Unattached Type-C state.

8.3.4 Cable Plug and Orientation Detection

Figure 8-20 shows the plug and orientation detection block at each CCy pin (CC1, CC2). Each pin has identical

detection circuitry.

VREF1

VREF2

VREF3

IRpDef

IRp1.5

IRp3.0

RSNK

CCy

Figure 8-20. Plug and Orientation Detection Block

8.3.4.1 Configured as a Source

When configured as a source, the TPS25751 detects when a cable or a Sink is attached using the CC1 and

CC2 pins. When in a disconnected state, the TPS25751 monitors the voltages on these pins to determine what,

if anything, is connected. See USB Type-C Specification for more information.

Table 8-1 shows the Cable Detect States for a Source.

Table 8-1. Cable Detect States for a Source

CC1

CC2

CONNECTION STATE

RESULTING ACTION

Open

Nothing attached

Continue monitoring both CCy pins for attach. Power is not applied to VBUS or

VCONN.

Open

Sink attached

Monitor CC1 for detach. Power is applied to VBUS but not to VCONN (CC2).

Open

Sink attached

Monitor CC2 for detach. Power is applied to VBUS but not to VCONN (CC1).

Open

Powered Cable-No UFP

attached

Monitor CC2 for a Sink attach and CC1 for cable detach. Power is not applied to

VBUS or VCONN (CC1).

TPS25751

SLVSH93 – OCTOBER 2023

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