SLASEC2B November 2016 – February 2019 TAS2557
As shown in Figure 22, a single-byte data-read transfer begins with the master device transmitting a start condition followed by the I2C device address and the read/write bit. For the data-read transfer, both a write followed by a read are actually done. Initially, a write is done to transfer the address byte of the internal memory address to be read. As a result, the read/write bit is set to a 0.
After receiving the TAS2557 address and the read/write bit, the device responds with an acknowledge bit. The master then sends the internal memory address byte, after which the device issues an acknowledge bit. The master device transmits another start condition followed by the TAS2557 address and the read/write bit again. This time, the read/write bit is set to 1, indicating a read transfer. Next, the TAS2557 transmits the data byte from the memory address being read. After receiving the data byte, the master device transmits a not-acknowledge followed by a stop condition to complete the single-byte data read transfer.