參數(shù)資料
型號(hào)： TMDS461PZTR
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP100
封裝： PLASTIC, TQFP-100
文件頁(yè)數(shù)： 27/43頁(yè)
文件大小： 3111K
代理商： TMDS461PZTR
DataOutput
by Transmitter
DataOutput
byReceiver
SCL From
Master
START
Condition
S
1
2
8
9
ClockPulsefor
Acknowledgement
Acknowledge
Not Acknowledge
T0395-01
SCL
SDA
MSB
Slave Address
Acknowledge
Data
Acknowledge
Stop
123456789123456789
T0396-01
S
Slave Address
W
A
Data
A
Data
A
P
FromReceiver
From Transmitter
A =No Acknowledge(SDA High)
A = Acknowledge
S=StartCondition
P =StopCondition
W=Write
R0007-01
www.ti.com ............................................................................................................................................................................................... SLLS915 – JANUARY 2009
Figure 40. I2C Acknowledge
Figure 41. I2C Address, Data Cycle(s), and Stop
During a write cycle, the transmitting device must not drive the SDA signal line during the acknowledge cycle so
that the receiving device may drive the SDA signal low. After each byte transfer following the address byte, the
receiving device pulls the SDA line low for one SCL clock cycle. A stop condition is initiated by the transmitting
device after the last byte is transferred. An example of a write cycle can be found in Figure 42 and Figure 43.
Note that the TMDS461 allows multiple write transfers to occur. See the Example – Writing to the TMDS461
section for more information.
During a read cycle, the slave receiver acknowledges the initial address byte if it decodes the address as its
address. Following this initial acknowledge by the slave, the master device becomes a receiver and
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 44 and Figure 45.
See the Example – Reading from the TMDS461 section for more information.
Figure 42. I2C Write Cycle
Copyright 2009, Texas Instruments Incorporated
33
Product Folder Link(s) :TMDS461
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