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参数资料
| 型号： | TVP5147PFPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 颜色信号转换 |
| 英文描述： | COLOR SIGNAL DECODER, PQFP80 |
| 封装： | GREEN, PLASTIC, HTQFP-80 |
| 文件页数： | 26/100页 |
| 文件大小： | 1465K |
| 代理商： | TVP5147PFPRG4 |
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Functional Description
24
SLES099C—March 2007
TVP5147PFP
Because SDA and SCL are kept open-drain at a logic-high output level or when the bus is not driven, the user
must connect SDA and SCL to a positive supply voltage via a pullup resistor on the board. The slave addresses
select signal, terminal 37 (I2CA), enables the use of two TVP5147 devices tied to the same I2C bus, because
it controls the least significant bit of the I2C device address.
Table 24. I2C Host Interface Terminal Description
SIGNAL
TYPE
DESCRIPTION
I2CA
I
Slave address selection
SCL
I
Input clock line
SDA
I/O
Input/output data line
2.6.1 Reset and I2C Bus Address Selection
The TVP5147 decoder can respond to two possible chip addresses. The address selection is made at reset
by an externally supplied level on the I2CA terminal. The TVP5147 decoder samples the level of terminal 37
at power up or at the trailing edge of RESETB and configures the I2C bus address bit A0. The I2CA terminal
has an internal pulldown resistor to pull the terminal low to set a zero.
Table 25. I2C Address Selection
A6
A5
A4
A3
A2
A1
A0 (I2CA)
R/W
HEX
1
0
1
0
0 (default)
1/0
B9/B8
1
0
1
0
1
1/0
BB/BA
If terminal 37 is strapped to DVDD via a 2.2-k
resistor, I2C device address A0 is set to 1.
2.6.2 I2C Operation
Data transfers occur using the following illustrated formats.
S
10111000
ACK
Subaddress
ACK
Send data
ACK
P
Read from I2C control registers
S
10111000
ACK
Subaddress
ACK
S
10111001
ACK
Receive data
NAK
P
S = I2C bus start condition
P = I2C bus stop condition
ACK = Acknowledge generated by the slave
NAK = Acknowledge generated by the master, for multiple-byte read master with ACK each byte except
last byte
Subaddress = Subaddress byte
Data = Data byte. If more than one byte of data is transmitted (read and write), the subaddress pointer is
automatically incremented.
I2C bus address = Example shown that I2CA is in default mode. Write (B8h), read (B9h)
2.6.3 VBUS Access
The TVP5147 decoder has additional internal registers accessible through an indirect access to an internal
24-bit address wide VBUS. Figure 223 shows the VBUS register access.
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