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參數(shù)資料
| 型號： | PCM3794RHBT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PQCC32 |
| 封裝： | 5 X 5 MM, GREEN, PLASTIC, QFN-32 |
| 文件頁數(shù)： | 20/67頁 |
| 文件大小： | 1417K |
| 代理商： | PCM3794RHBT |
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www.ti.com
Packet Protocol
9
SDA
SCL
St
Start
17
8
18
9
18
9
Sp
Stop
Slave Address
ACK
DATA
ACK
DATA
ACK
Condition
R/W
Write Operation
Transmitter
M
S
M
S
M
Data Type
St
Slave Address
R/W
ACK
DATA
ACK
Sp
R/W:
Read Operation if 1; Otherwise, Write Operation
ACK:
Acknowledgement of a Byte if 0
DATA: 8 Bits (Byte)
T0049-03
M: Master Device
St: Start Condition
M
DATA
Read Operation
Transmitter
M
S
M
S
M
Data Type
St
Slave Address
R/W
ACK
DATA
NACK
Sp
S
DATA
S: Slave Device
Sp: Stop Condition
Transmitter
M
Data Type
Slave Address
Reg Address
Write Data
R0002-01
M: Master Device S: Slave Device
St: Start Condition W: Write ACK: Acknowledge Sp: Stop Condition
M
S
M
St
W
ACK
Sp
S
ACK
M
S
ACK
SLES193C – AUGUST 2006 – REVISED FEBRUARY 2007
The master device must control packet protocol, which consists of start condition, slave address with read/write
bit, data if write or acknowledgement if read, and stop condition. The PCM3793/94 supports only slave receiver
and slave transmitter.
Figure 32. Basic I2C Framework
WRITE OPERATION
A master can write any PCM3793/94 registers using single access. The master sends a PCM3793/94 slave
address with a write bit, a register address, and the data. When undefined registers are accessed, the
PCM3793/94 does not send an acknowledgement. Figure 33 shows a diagram of the write operation.
Figure 33. Framework for Write Operation
READ OPERATION
A master can read the PCM3793/94 register. The value of the register address is stored in an indirect index
register in advance. The master sends a PCM3793/94 slave address with a read bit after storing the register
address. Then the PCM3793/94 transfers the data which the index register points to. Figure 34 shows a diagram
of the write operation.
27
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