Datasheet

SINK
HDMI RX
DDC_SDA
DDC_SCL
Y1/Z1
Y2/Z2
Y3/Z3
Y4/Z4
5V
47kW
3.3V
4.7kW 4.7kW
CEC
4.02kW 10%
E-EDID
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
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
SOURCE
with AC coupled
HDMI output
SINK
HDMI RX
DDC_SDA
DDC_SCL
Y1/Z1
Y2/Z2
Y3/Z3
Y4/Z4
3.3V
4.7kW 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
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
with DC coupled
HDMI output
CEC
PHY
TMDS251
SLLS852A –AUGUST 2007– REVISED JULY 2011 www.ti.com
E-EDID Reading Configurations in Standby Mode
When the TMDS251 is in standby mode operation, S1 = H and S2 = L, all sources can read their E-EDID
memories simultaneously with all HPD pins following HPD_SINK in logic-high. HPD_SINK input low will prevent
E-EDID reading in standby mode operation.
Figure 19. Two-Port HDMI Enabled DTV with TMDS251 – AC Coupled Source - CEC Commands Active
Figure 20. Two-Port HDMI Enabled DTV with TMDS251 – DC Coupled Source - CEC Commands Active
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