參數(shù)資料
型號(hào)： TMDS261BPAG
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP64
封裝： GREEN, PLASTIC, TQFP-64
文件頁(yè)數(shù)： 33/49頁(yè)
文件大?。?/td> 11321K
代理商： TMDS261BPAG
Start
Condition
SDA
Acknowledge
(FromReceiver)
Acknowledge
(From Transmitter)
Not Acknowledge
(Transmitter)
Stop
Condition
LastDataByte
I CDevice Addressand
Read/WriteBit
2
FirstData
Byte
Other
DataBytes
A6
A0
ACK
R/W
D7
D0
ACK
D7
D6
D1
D0
ACK
T0398-01
Slave Address
EXAMPLE – WRITING TO THE TMDS261B
www.ti.com .......................................................................................................................................................................................... SLLS987 – SEPTEMBER 2009
Figure 57. Multiple-Byte Read Transfer
Both SDA and SCL must be connected to a positive supply voltage via a pullup 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 7-bit address is
factory preset to 0101 100. Table 7 lists the calls that the TMDS261B responds to.
Table 7. TMDS261B Slave Address
FIXED ADDRESS
READ/WRITE BIT
Bit 7 (MSB)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0 (R/W)
0
1
0
1
0
1/0
The proper way to write to the TMDS261B is illustrated as follows:
An I2C master initiates a write operation to the TMDS261B by generating a start condition (S) followed by the
TMDS261B I2C address (as shown following, in MSB-first bit order, followed by a 0 to indicate a write cycle. After
receiving an acknowledge from the TMDS261B, the master presents the subaddress (sink port) to be written,
consisting of one byte of data, MSB-first. The TMDS261B acknowledges the byte after completion of the transfer.
Finally, the master presents the data to be written to the register (sink port), and the TMDS261B acknowledges
the byte. The master can continue presenting data to be written after TMDS261B acknowledges the previous
byte (steps 6, 7). After the last byte to be written has been acknowledged by TMDS261B, the I2C master then
terminates the write operation by generating a stop condition (P).
Step 1
0
I2C start (master)
S
Step 2
7
6
5
4
3
2
1
0
I2C general address (master)
0
1
0
1
0
Step 3
8
I2C acknowledge (slave)
A
Step 4
7
6
5
4
3
2
1
0
I2C write sink logic address (master)
0
Addr
Step 5
8
I2C acknowledge (slave)
A
Step 6
7
6
5
4
3
2
1
0
I2C write data (master)
Data
Data is the register address or register data to be written
Step 7
8
I2C acknowledge (slave)
A
Copyright 2009, Texas Instruments Incorporated
39
Product Folder Link(s) :TMDS261B
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