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參數資料
| 型號： | TMDS442PNPRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP128 |
| 封裝： | PLASTIC, TQFP-128 |
| 文件頁數： | 19/45頁 |
| 文件大?。?/td> | 1977K |
| 代理商： | TMDS442PNPRG4 |
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A =No Acknowledge(SDA High)
A = Acknowledge
S=StartCondition
P =StopCondition
W=Write
R=Read
A
P
DATA
S
Slave Address
FromTransmitter
FromReceiver
W
A6
A5
2
A0
A1
ACK
Acknowledge
(FromReceiver)
ICDevice Addressand
Read/WriteBit
R/W
D7
D6
D0
ACK
Stop
Condition
Acknowledge
(Receiver)
LastDataByte
SDA
D7
D6
D1
FirstData
Byte
Start
Condition
Acknowledge
(Transmitter)
ACK
Other
DataBytes
A =No Acknowledge(SDA High)
A = Acknowledge
S=StartCondition
P =StopCondition
W=Write
R=Read
A
P
DATA
S
Slave Address
Transmitter
Receiver
R
A6
2
A0
ACK
Acknowledge
(From
Receiver)
ICDevice Addressand
Read/WriteBit
R/W
D7
D0
ACK
Stop
Condition
Acknowledge
(From
Transmitter)
LastDataByte
SDA
D7
D6
D1
D0
ACK
FirstData
Byte
Start
Condition
Not
Acknowledge
(Transmitter)
Other
DataBytes
Slave Address
SLLS757A – AUGUST 2006 – REVISED MARCH 2007
acknowledges data bytes sent by the slave. When the master has received all of the requested data bytes from
the slave, the not acknowledge (A) condition is initiated by the master by keeping the SDA signal high just before
it asserts the stop (P) condition. This sequence terminates a read cycle as shown in Figure 29 and Figure 30.
Note that the TMDS442 does not allow multiple read transfers to occur. See Example – Reading from the
TMDS442 section for more information.
Figure 27. I2C Write Cycle
Figure 28. Multiple Byte Write Transfer
Figure 29. I2C Read Cycle
Figure 30. Multiple Byte Read Transfer
Both SDA and SCL must be connected to a positive supply voltage via a pull-up resistor. These resistors should
comply with the I2C specification that ranges from 2 k
to 19 k. When the bus is free, both lines are high. The
address byte is the first byte received following the START condition from the master device. The first 5 Bits
(MSBs) of the address are factory preset to 01011. The next two bits of the TMDS442 address are controlled by
26
Copyright 2006–2007, Texas Instruments Incorporated
Product Folder Link(s): TMDS442
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