TAS5508C datasheet(67/107 Pages) TI

67 / 107 page

A0 R/W ACK A7

A0 ACK

ACK

Start

Condition

Stop

Condition

Acknowledge

I CDevice Addressand

Read/WriteBit

Subaddress

DataByte

D0 ACK

I CDevice Addressand

Read/WriteBit

Not

Acknowledge

R/W

RepeatStart

Condition

T0483-01

TAS5508C

www.ti.com

SLES257 – SEPTEMBER 2010

5.5

Incremental Multiple-Byte Write

The I2C supports a special mode which permits I2C write operations to be broken up into multiple data

write operations that are multiples of four data bytes. These are 6-byte, 10-byte, 14-byte, 18-byte, etc.,

write operations that are composed of a device address, read/write bit, subaddress, and any multiple of

four bytes of data. This permits the system to write large register values incrementally without blocking

other I2C transactions.

This feature is enabled by the append subaddress function in the TAS5508C. This function enables the

TAS5508C to append four bytes of data to a register that was opened by a previous I2C register write

operation but has not received its complete number of data bytes. Because the length of the long registers

is a multiple of four bytes, using four-byte transfers has only an integral number of append operations.

When the correct number of bytes has been received, the TAS5508C starts processing the data.

The procedure to perform an incremental multibyte-write operation is as follows:

1. Start a normal I2C write operation by sending the device address, write bit, register subaddress, and

the first four bytes of the data to be written. At the end of that sequence, send a stop condition. At this

point, the register has been opened and accepts the remaining data that is sent by writing four-byte

blocks of data to the append subaddress (0xFE).

2. At a later time, one or more append data transfers are performed to incrementally transfer the

remaining number of bytes in sequential order to complete the register write operation. Each of these

append operations is composed of the device address, write bit, append subaddress (0xFE), and four

bytes of data followed by a stop condition.

3. The operation is terminated due to an error condition, and the data is flushed:

(a) If a new subaddress is written to the TAS5508C before the correct number of bytes are written.

(b) If more or fewer than four bytes are data written at the beginning or during any of the append

operations.

5.6

Single-Byte Read

As shown in Figure 5-4, 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

and then a read are actually performed. Initially, a write is performed to transfer the address byte or bytes

of the internal memory address to be read. As a result, the read/write bit is a 0. After receiving the

TAS5508C address and the read/write bit, the TAS5508C responds with an acknowledge bit. In addition,

after sending the internal memory address byte or bytes, the master device transmits another start

condition followed by the TAS5508C address and the read/write bit again. This time the read/write bit is a

1, indicating a read transfer. After receiving the TAS5508C and the read/write bit the TAS5508C again

responds with an acknowledge bit. Next, the TAS5508C 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.

Figure 5-4. Single-Byte Read Transfer

I2C Serial-Control Interface (Slave Address 0x36)

Submit Documentation Feedback

Product Folder Link(s): TAS5508C

TAS5508C Datasheet(PDF) 67 Page - Texas Instruments

TAS5508C Datasheet(HTML) 67 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL