TPS25814 datasheet(23/46 Pages) TI

部品番号	TPS25814

部品情報	TPS25814 USB Type-C짰 Controller with Integrated Source Power Switch

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Data Line

Change

SDA

SCL

Figure 8-8. I2C Bit Transfer

S

Start

Condition

1

2

8

9

Ack

Nack

Clock Pulse for

Acknowledgement

Data Output

by Transmitter

Data Output

by Receiver

SCL From

Master

Figure 8-9. I2C Acknowledgment

8.3.7.2 I2C Clock Stretching

The TPS25814 features clock stretching for the I2C protocol. The TPS25814 slave I2C port may hold the clock

line (SCL) low after receiving (or sending) a byte, indicating that it is not yet ready to process more data. The

master communicating with the slave must not finish the transmission of the current bit and must wait until the

clock line actually goes high. When the slave is clock stretching, the clock line remains low.

The master must wait until it observes the clock line transitioning high plus an additional minimum time (4 μs for

standard 100-kbps I2C) before pulling the clock low again.

Any clock pulse may be stretched but typically it is the interval before or after the acknowledgment bit.

8.3.7.3 I2C Address Setting

The host should only use I2C_EC_SCL/SDA for loading a patch bundle. Once the boot process is complete,

each port has a unique slave address on the I2C_EC_SCL/SDA bus as selected by the ADCINx pins.

Table 8-6. I2C Default Slave Address for I2C_EC_SCL/SDA.

ADCIN1 Decoding

Slave Address

ADCIN1[1]

ADCIN1[0]

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0

1

0

R/W

0

1

0

1

0

1

R/W

1

0

1

0

1

0

R/W

1

0

1

0

1

R/W

8.3.7.4 Unique Address Interface

The Unique Address Interface allows for complex interaction between an I2C master and a single TPS25814.

The I2C Slave sub-address is used to receive or respond to Host Interface protocol commands. Figure 8-10 and

Figure 8-11 show the write and read protocol for the I2C slave interface, and a key is included in Figure 8-12 to

explain the terminology used. The key to the protocol diagrams is in the SMBus Specification and is repeated

here in part.

www.ti.com

TPS25814

SLVSEZ5A – JULY 2020 – REVISED DECEMBER 2020

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