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| 型号： | TMDS261PAG |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封装： | GREEN, PLASTIC, TQFP-64 |
| 文件页数： | 25/43页 |
| 文件大小： | 2160K |
| 代理商： | TMDS261PAG |
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SINK
HDMI RX
DDC_SDA
DDC_SCL
Y1/Z1
Y2/Z2
Y3/Z3
Y4/Z4
3.3V
4.7kW
4.02kW 10%
mController
HPDx
SDAx
SCLx
Ax1/Bx1
Ax2/Bx2
Ax3/Bx3
Ax4/Bx4
EQ
S1
S2
HPD_SINK
SDA_SINK
SCL_SINK
Y1/Z1
Y2/Z2
Y3/Z3
Y4/Z4
VSadj
VDD
(5V)
VCC
(3.3V)
GND
SDA SCL
CEC
LOGIC
CEC
PHY
1kW
5V
47kW
CEC E-EDID
1kW
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
SOURCE
in general HDMI output
I
2C INTERFACE NOTES
S
Start
Condition
Stop
Condition
P
SDA
SCL
SDA
SCL
T0393-01
GENERAL I
2C PROTOCOL
www.ti.com............................................................................................................................................................................................ SLLS953 – DECEMBER 2008
Figure 37. Two-Port HDMI Enabled DTV With TMDS261 – External Logic – CEC Commands Active
The I2C interface is used to access the internal registers of the TMDS261. I2C is a two-wire serial interface
developed by Philips Semiconductor (see I2C-Bus Specification, Version 2.1, January 2000). The bus consists of
a data line (SDA) and a clock line (SCL) with pullup structures. When the bus is idle, both SDA and SCL lines
are pulled high. All the I2C-compatible devices connect to the I2C bus through open-drain I/O pins, SDA and
SCL. A master device, usually a microcontroller or a digital signal processor, controls the bus. The master is
responsible for generating the SCL signal and device addresses. The master also generates specific conditions
that indicate the START and STOP of data transfer. A slave device receives and/or transmits data on the bus
under control of the master device. The TMDS261 works as a slave and supports standard-mode transfer (100
kbps).
The basic access cycle consists of the following:
A start condition
A slave address cycle
Any number of data cycles
A stop condition
Figure 38. I2C Start and Stop Conditions
The master initiates data transfer by generating a start condition. The start condition is when a high-to-low
Copyright 2008, Texas Instruments Incorporated
31
Product Folder Link(s) :TMDS261
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