TAS2020 datasheet(33/79 Pages) TI2

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6.5.6 I2C Multiple-Byte Write

As shown in Figure 6-9, a multiple-byte data write transfer is identical to a single-byte data write transfer except

that multiple data bytes are transmitted by the controller device to the target device. After receiving each data

byte, the device responds with an acknowledge bit (ACK). Finally, the controller device transmits a stop condition

after the last data-byte write transfer.

Figure 6-9. I2C Multiple-Byte Write Transfer

6.5.7 I2C Single-Byte Read

As shown in Figure 6-10, a single-byte data read transfer begins with the controller device transmitting a start

condition followed by the I2C target address and the read/write bit. For the data read transfer, both a write

followed by a read are done. Initially, a write is done to transfer the address byte of the internal register address

to be read. As a result, the read/write bit is set to 0.

After receiving the target address and the read/write bit, the device responds with an acknowledge bit

(ACK). The controller device then sends the internal register address byte, after which the device issues an

acknowledge bit (ACK). The controller device transmits another start condition followed by the target address

and the read/write bit again. This time, the read/write bit is set to 1, indicating a read transfer. Next, the device

transmits the data byte from the register address being read. After receiving the data byte, the controller device

transmits a not-acknowledge (NACK) followed by a stop condition to complete the single-byte data read transfer.

A0 R/W ACK A7

A0 ACK

ACK

Start

Condition

Stop

Condition

Acknowledge

I2CDeviceAddressand

Read/WriteBit

DataByte

D0 ACK

I2CDeviceAddressand

Read/WriteBit

Not

Acknowledge

R/W

RepeatStart

Condition

Figure 6-10. I2C Single-Byte Read Transfer

6.5.8 I2C Multiple-Byte Read

As shown in Figure 6-11, a multiple-byte data read transfer is identical to a single-byte data read transfer except

that multiple data bytes are transmitted by the device to the controller device. With the exception of the last

data byte, the controller device responds with an acknowledge bit after receiving each data byte. After receiving

the last data byte, the controller device transmits a not-acknowledge (NACK) followed by a stop condition to

complete the data read transfer.

ACK

Acknowledge

I2CDeviceAddressand

Read/WriteBit

R/W

R/W ACK

A0 ACK

ACK

Start

Condition

Stop

Condition

Acknowledge

LastDataByte

ACK

FirstDataByte

RepeatStart

Condition

Not

Acknowledge

I2CDeviceAddressand

Read/WriteBit

OtherDataBytes

D0 ACK

Acknowledge

Figure 6-11. I2C Multiple-Byte Read Transfer

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TAS2020

SLASFD4A – AUGUST 2024 – REVISED JULY 2026

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