Datasheet

SINK
HDMIRX
DDC_SDA
DDC_SCL
5V
5V
5V
47kW
47kW
47kW
3.3V
4.7kW 4.7kW
CEC
CEC
CEC
4.02 k
W 10%
E-EDID
E-EDID
E-EDID
mController
HPD1
SDA1
SCL1
HPD2
SDA2
SCL2
HPD3
SDA3
SCL3
EQ
S1
S2
HPD_SINK
SDA_SINK
SCL_SINK
Y1/Z1
Y2/Z2
Y3/Z3
Y4/Z4
VSADJ
GND
SDA SCL
CEC
LOGIC
CEC
PHY
1k
W
1kW
1k W
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
HPD
5V
SDA
SCL
CEC
CLK
D0
D1
D2
SOURCE1
With ACCoupled
HDMIOutput
SOURCE2
WithDCCoupled
HDMIOutput
SOURCE3
inGeneral
HDMIOutput
A11/B11
A12/B12
A13/B13
A14/B14
A21/B21
A22/B22
A23/B23
A24/B24
A31/B31
A32/B32
A33/B33
A34/B34
VDD
(5V)
VCC
(3.3V)
Y1/Z1
Y2/Z2
Y3/Z3
Y4/Z4
TMDS351
SLLS840B – MAY 2007– REVISED JULY 2011 www.ti.com
Case 3 – External Logic Control for HPD (See Figure 19, Port 3)
When the HDMI transmitter does not have the capability of detecting the receiver termination, using the HPD
signal as a reference for sensing port selections is the only possible method. External control logic for switching
the connections of the HPD signals between the HPD pins of the TMDS351 and the 5-V signal from the source
provides a good solution.
E-EDID Reading Configurations in Standby Mode
When the TMDS351 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. Three-Port HDMI Enabled DTV with TMDS351 – CEC Commands Active
20 Copyright © 2007–2011, Texas Instruments Incorporated