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參數資料
| 型號： | TMDS461PZIT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP100 |
| 封裝： | PLASTIC, TQFP-100 |
| 文件頁數： | 13/24頁 |
| 文件大小： | 1467K |
| 代理商： | TMDS461PZIT |
PRODUCTPREVIEW
Slave Address
EXAMPLE – WRITING TO THE TMDS461
SLLS915 – AUGUST 2008 ................................................................................................................................................................................................. www.ti.com
address. Following this initial acknowledge by the slave, the master device becomes the receiver. When the
master has received the requested data byte 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 18. Note that the TMDS461 does not allow multiple read transfers to occur. See
Example – Reading from the TMDS461 section for more information.
Figure 19. I2C Write Cycle
Figure 20. I2C Read Cycle
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 7-bit address is
factory preset to 010110x. Table 9 lists the calls that the TMDS461 will respond to.
Table 9. TMDS461 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
x
1/0
The proper way to write to the TMDS461 is illustrated as follows:
An I2C master initiates a write operation to the TMDS461 by generating a start condition (S) followed by the
TMDS461 I2C address (as shown below), in MSB-first bit order, followed by a 0 to indicate a write cycle. After
receiving an Acknowledge from the TMDS461, the master presents the sub-address (sink port) to write
consisting of one byte of data, MSB first. The TMDS461 acknowledges the byte after completion of the transfer.
Finally the master presents the data to write to the register (sink port) and the TMDS461 acknowledges the byte.
The I2C master then terminates the write operation by generating a stop condition (P). Note that the TMDS461
does not support multi-byte transfers. To write to both sink ports, or registers, this procedure must be repeated
for each register one series at a time (i.e., repeat steps 1 through 8 for each sink port).
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
X
0
20
Copyright 2008, Texas Instruments Incorporated
Product Folder Link(s) :TMDS461
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