TPS25751AS datasheet(55/85 Pages) TI2

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TPS25751A

GPIOx

GPIO0

GND

GPIO2

USB Type-C

Connector

SBU1

SBU2

GND

Liquid Detection +

Protection Circuit

VBUS

CCx

VBUS

CCx

0V – 20V

0V – 3.3V (5V

for Vconn)

Liquid Control

RSaV

RSaCC

RSaG

Figure 9-3. Liquid Detection Cases

9.2.1.2 BC1.2 Application Design Requirements

The PD controller uses the USB D+ and D- pins to provide BC1.2 detection and advertisement. The USB D+ and

D- are connected to the USB Host (DFP) or USB Device (UFP) from the Type-C connector for Charging Data

Port applications.

9.2.1.3 USB Data Support Design Requirements

For USB3 operation, the SSTX/RX are muxed to the Type-C connector. A SuperSpeed Mux generally has two

control signals; enable and plug orientation. The PD controller determines when a connection is detected and

drives the required GPIO to control the SuperSpeed Mux.

9.2.2 Detailed Design Procedure

9.2.2.1 Liquid Detection

The TPS25751A supports liquid detection using the built-in internal ADC and GPIO with external circuitry.

TPS25751A Liquid Detection Block Diagram - CC1 and CC2 Monitor Pins and TPS25751A Liquid Detection

Block Diagram - SBU1 and SBU2 Monitor Pins show the hardware implementation using CC1/2 and SBU1/2

pins for liquid detection with the TPS25751A. The TPD4S201 is used to protect the ADC pins from over voltage

conditions when there is liquid shorting VBUS to the monitoring pins. When liquid is detected, the TPS25751A

takes action to protect the Type-C port. Systems using an embedded host controller can leverage the Host

Interface for additional notification and control.

Table 9-2. Liquid Detection GPIO Pin Function

Function

GPIO0 and GPIO2

Internal ADC to measure the biased voltage on the monitoring pins.

GPIOx

Output GPIO that controls the biasing voltage that drives the

monitoring pins High and Low.

GPIOy

Input GPIO that initiates Type-C Error Recovery when a fault is

detected by the protection device.

www.ti.com

TPS25751A

SLVSJG7 – MAY 2026

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