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| 型号： | TAS5508PAGR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 68/105页 |
| 文件大小： | 1286K |
| 代理商： | TAS5508PAGR |
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5
I
2C Serial-Control Interface (Slave Address 0x36)
5.1
General I
2C Operation
7-BitSlave Address
R/
W
8-BitRegister Address(N)
A
8-BitRegisterDataFor
Address(N)
Start
Stop
SDA
SCL
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
A
8-BitRegisterDataFor
Address(N)
A
T0035-01
5.2
Single- and Multiple-Byte Transfers
TAS5508
8-Channel Digital Audio PWM Processor
www.ti.com
SLES091D – FEBRUARY 2004 – REVISED JULY 2009
The TAS5508 has a bidirectional I2C interface that is compatible with the Inter-IC (I2C) bus protocol and
supports both 100-kbps and 400-kbps data transfer rates for single- and multiple-byte write and read
operations. This is a slave-only device that does not support a multimaster bus environment or wait state
insertion. The control interface is used to program the registers of the device and to read device status.
The TAS5508 supports the standard-mode I2C bus operation (100 kHz maximum) and the fast I2C bus
operation (400 kHz maximum). The TAS5508 performs all I2C operations without I2C wait cycles.
The I2C 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 can be
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 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 5-1. 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 TAS5508 holds SDA low during the 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. An external pullup resistor must be used for
the SDA and SCL signals to set the high level for the bus.
Figure 5-1. Typical I2C 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 5-1.
The 7-bit address for the TAS5508 is 0011011.
The serial-control interface supports both single-byte and multiple-byte read/write operations for status
registers and the general control registers associated with the PWM. However, for the DAP data
processing registers, the serial-control interface supports only multiple-byte (four-byte) read/write
operations.
During multiple-byte read operations, the TAS5508 responds with data, a byte at a time, starting at the
subaddress assigned, as long as the master device continues to respond with acknowledges. If a
particular subaddress does not contain 32 bits, the unused bits are read as logic 0.
65
I2C Serial-Control Interface (Slave Address 0x36)
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