TPS25751AS datasheet(44/88 Pages) TI2

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8.3.9 BC 1.2 (USB_P, USB_N)

The TPS25751A supports BC 1.2 as a Portable Device or Downstream Port using the hardware shown in Figure

8-24.

Figure 8-24. BC1.2 Hardware Components

8.3.10 Digital Interfaces

The TPS25751A contains several different digital interfaces which can be used for communicating with other

devices. The available interfaces include one I2C controller, one I2C target and additional GPIOs.

8.3.10.1 General GPIO

GPIOx pins can be mapped to USB Type-C, USB PD, and application-specific events to control other ICs,

interrupt a host processor, or receive input from another IC. This buffer is configurable to be a push-pull output,

a weak push-pull, or open drain output. When configured as an input, the signal can be a de-glitched digital

input. The push-pull output is a simple CMOS output with independent pull-down control allowing open-drain

connections. The weak push-pull is also a CMOS output, but with GPIO_RPU resistance in series with the drain.

The supply voltage to the output buffer is LDO_3V3 and LDO_1V5 to the input buffer. When interfacing with non

3.3V I/O devices the output buffer can be configured as an open drain output and an external pull-up resistor

attached to the GPIO pin. The pull-up and pull-down output drivers are independently controlled from the input

and are enabled or disabled via application code in the digital core.

Table 8-3. GPIO Functionality Table

PIN NAME

TYPE

SPECIAL FUNCTIONALITY

GPIO0

I/O

General-purpose input or output, or LD1 for Liquid Detection

GPIO1

I/O

General-purpose input or output

GPIO2

I/O

General-purpose input or output, or LD2 for Liquid Detection

GPIO3

I/O

General-purpose input or output

GPIO4

I/O

D+, general-purpose input or output

GPIO5

I/O

D-, general-purpose input or output

GPIO6

I/O

General-purpose input or output

GPIO7

I/O

General-purpose input or output

I2Ct_IRQ(GPIO10)

IRQ for optional I2Ct, or used as a general-purpose output

GPIO11

General-purpose output

I2Cc_IRQ(GPIO12)

IRQ for I2Cc, or used as a general-purpose input

TPS25751A

SLVSJG7 – MAY 2026

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