TUSB1004 datasheet(29/53 Pages) TI

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7.5.3 TUSB1004 I2C Target Behavior

Target Address

Write

Ack

Start

Data wri en

Figure 7-2. I2C Write with Data

The following procedure should be followed to write data to TUSB1004 I2C registers (refer to Figure 7-2):

1. The controller initiates a write operation by generating a start condition (S), followed by the TUSB1004 7-bit

address and a zero-value “W/R” bit to indicate a write cycle.

2. The TUSB1004 acknowledges the address cycle.

3. The controller presents the register offset within TUSB1004 to be written, consisting of one byte of data,

MSB-first.

4. The TUSB1004 acknowledges the sub-address cycle.

5. The controller presents the first byte of data to be written to the I2C register.

6. The TUSB1004 acknowledges the byte transfer.

7. The controller may continue presenting additional bytes of data to be written, with each byte transfer

completing with an acknowledge from the TUSB1004.

8. The controller terminates the write operation by generating a stop condition (P).

Target Address

Data from o set 0x00

last read address + 1

Read

Ack

Start

Stop

Figure 7-3. I2C Read Without Repeated Start

The following procedure should be followed to read the TUSB1004 I2C registers without a repeated Start (refer

Figure 7-3).

1. The controller initiates a read operation by generating a start condition (S), followed by the TUSB1004 7-bit

address and a zero-value “W/R” bit to indicate a read cycle.

2. The TUSB1004 acknowledges the 7-bit address cycle.

3. Following the acknowledge the controller continues sending clock.

4. The TUSB1004 transmit the contents of the memory registers MSB-first starting at register 00h or last read

5. The TUSB1004 waits for either an acknowledge (ACK) or a not-acknowledge (NACK) from the controller

after each byte transfer; the I2C controller acknowledges reception of each data byte transfer.

6. If an ACK is received, the TUSB1004 transmits the next byte of data as long as controller provides the clock.

If a NAK is received, the TUSB1004 stops providing data and waits for a stop condition (P).

7. The controller terminates the write operation by generating a stop condition (P).

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