TAS5715
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SLOS645 –AUGUST 2010
Supplying a subaddress for each subaddress transaction is referred to as random I2C addressing. The TAS5715
also supports sequential I2C addressing. For write transactions, if a subaddress is issued followed by data for
that subaddress and the 15 subaddresses that follow, a sequential I2C write transaction has taken place, and the
data for all 16 subaddresses is successfully received by the TAS5715. For I2C sequential write transactions, the
subaddress then serves as the start address, and the amount of data subsequently transmitted, before a stop or
start is transmitted, determines how many subaddresses are written. As was true for random addressing,
sequential addressing requires that a complete set of data be transmitted. If only a partial set of data is written to
the last subaddress, the data for the last subaddress is discarded. However, all other data written is accepted;
only the incomplete data is discarded.
Single-Byte Write
As shown in Figure 42, a single-byte data-write transfer begins with the master device transmitting a start
condition followed by the I2C device address and the read/write bit. The read/write bit determines the direction of
the data transfer. For a data-write transfer, the read/write bit is 0. After receiving the correct I2C device address
and the read/write bit, the DAP responds with an acknowledge bit. Next, the master transmits the address byte or
bytes corresponding to the TAS5715 internal memory address being accessed. After receiving the address byte,
the TAS5715 again responds with an acknowledge bit. Next, the master device transmits the data byte to be
written to the memory address being accessed. After receiving the data byte, the TAS5715 again responds with
an acknowledge bit. Finally, the master device transmits a stop condition to complete the single-byte data-write
transfer.
Start
Condition
Acknowledge
Acknowledge
Acknowledge
R/W
A6 A5 A4 A3 A2 A1 A0
ACK A7 A6 A5 A4 A3 A2 A1 A0 ACK D7 D6 D5 D4 D3 D2 D1 D0 ACK
I2C Device Address and
Read/Write Bit
Subaddress
Data Byte
Stop
Condition
T0036-01
Figure 42. Single-Byte Write Transfer
Multiple-Byte Write
A multiple-byte data-write transfer is identical to a single-byte data write transfer except that multiple data bytes
are transmitted by the master device to the DAP as shown in Figure 43. After receiving each data byte, the
TAS5715 responds with an acknowledge bit.
Start
Condition
Acknowledge
Acknowledge
Acknowledge
D0 ACK D7
Acknowledge
D0 ACK D7
Acknowledge
D0 ACK
A6 A5
A1 A0 R/W ACK A7 A6 A5 A4 A3
A1 A0 ACK D7
I2C Device Address and
Read/Write Bit
Subaddress
First Data Byte
Last Data Byte
Stop
Condition
Other Data Bytes
T0036-02
Figure 43. Multiple-Byte Write Transfer
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