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參數(shù)資料
| 型號： | TPA5051_07 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | FOUR CHANNEL DIGITAL AUDIO LIP-SYNC DELAY WITH I2C CONTROL |
| 中文描述： | 四通道數(shù)字音頻口形同步延遲與I2C控制 |
| 文件頁數(shù)： | 7/21頁 |
| 文件大?。?/td> | 710K |
| 代理商： | TPA5051_07 |
www.ti.com
GENERAL I
2
C OPERATION
The I
2
C bus employs two signals; SDA (data) and SCL (clock), to communicate between integrated circuits in a
system. Data is transferred on the bus serially, one bit at a time. The address and data are transferred in byte
(8-bit) format with the most-significant bit (MSB) transferred first. In addition, each byte transferred on the bus is
acknowledged by the receiving device with an acknowledge bit. Each transfer operation begins with the master
device driving a start condition on the bus and ends with the master device driving a stop condition on the bus.
The bus uses transitions on the data terminal (SDA) while the clock is high to indicate start and stop conditions.
A high-to-low transition on SDA indicates a start and a low-to-high transition indicates a stop. Normal data-bit
transitions must occur within the low time of the clock period. These conditions are shown in
Figure 5
. The
master generates the 7-bit slave address and the read/write (R/W) bit to open communication with another
device and then wait for an acknowledge condition. The TPA5051 holds SDA low during acknowledge clock
period to indicate an acknowledgement. When this occurs, the master transmits the next byte of the sequence.
Each device is addressed by a unique 7-bit slave address plus R/W bit (1 byte). All compatible devices share
the same signals via a bidirectional bus using a wired-AND connection.
Register (N)
8- Bit Data for
8- Bit Data for
Register (N+1)
SINGLE-AND MULTIPLE-BYTE TRANSFERS
The serial control interface supports both single-byte and multi-byte read/write operations for all registers.
TPA5051
SLOS497A–JUNE 2006–REVISED JULY 2006
APPLICATION INFORMATION (continued)
An external pull-up resistor must be used for the SDA and SCL signals to set the HIGH level for the bus. When
the bus level is 5 V, pull-up resistors between 1 k
and 2 k
in value must be used. For a bus level of 3.3 V,
higher resistor values, such as 10 k
, may be used.
Figure 5. Typical I
2
C Sequence
There is no limit on the number of bytes that can be transmitted between start and stop conditions. When the
last word transfers, the master generates a stop condition to release the bus. A generic data transfer sequence
is shown in
Figure 5
.
The 7-bit address for the TPA5051 is selectable using the 3 address pins (ADD0, ADD1, ADD2).
Table 1
lists
the 8 possible slave addresses.
Table 1. I
2
C Slave Address
SELECTABLE ADDRESS BITS
ADD1
0
0
1
1
0
0
1
1
FIXED ADDRESS
(4 MSB bits)
ADD2
0
0
0
0
1
1
1
1
ADD0
0
1
0
1
0
1
0
1
1101
1101
1101
1101
1101
1101
1101
1101
During multiple-byte read operations, the TPA5051 responds with data, a byte at a time, starting at the register
assigned, as long as the master device continues to respond with acknowledges.
7
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