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TDP158 Datasheet(PDF) 22 Page - Texas Instruments

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Part No. TDP158
Description  6-Gbps, AC-Coupled to TMDS or HDMI Redriver
Download  55 Pages
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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TDP158 Datasheet(HTML) 22 Page - Texas Instruments

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IN_CLKp
IN_CLKn
IN_D[2:0]p
IN_D[2:0]n
SIGNAL
DETECT
50
Ÿ
50
Ÿ
50
Ÿ
50
Ÿ
Control Block, I2C Registers
Local
I2C
Control
I2C_EN
A0/EQ1
VBIAS
VBIAS
A0
A1
EQ1
OUT_CLKp
OUT_D[2:0]p
OUT_CLKn
OUT_D[2:0]n
EQ
EQ
EQ_CTL
SDA_CTL/PRE
SCL_CTL/SWAP
VSADJ
TERM
SLEW
OE
A1/EQ2
MODE_TERM
SLEW
DE
Enable
TMDS
TMDS
SIG_DET_
OUT
SIG_DET_OUT
ACTIVE DDC BLOCK
HPD_SNK
HPD_SRC
190
SDA_SRC
SCL_SRC
SDA_SNK
SCL_SNK
DDC Snoop Block
GND
VDD
VCC
1.1 V
3.3 V
VREG
EQ2
Enable
SDA
SCL
PRE
SWAP
Copyright © 2016, Texas Instruments Incorporated
22
TDP158
SLLSEX2 – DECEMBER 2016
www.ti.com
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Copyright © 2016, Texas Instruments Incorporated
8.2 Functional Block Diagram
8.3 Feature Description
8.3.1 Reset Implementation
When OE is low, Control signal inputs are ignored; the HDMI inputs and outputs are high impedance. It is critical
to transition the OE from a low level to high after the VCC supply has reached the minimum recommended
operating voltage. This is achieved by a control signal to the OE input, or by an external capacitor connected
between OE and GND. To insure the TDP158 is properly reset, the OE pin must be de-asserted for at least 100
μs before being asserted. When OE is re-asserted the TDP158 must be reprogrammed if it was programmed by
I2C and not pin strapping. When implementing the external capacitor, the size of the external capacitor depends
on the power up ramp of the VCC supply, where a slower ramp-up results in a larger value external capacitor.
Refer to the latest reference schematic for TDP158; consider approximately 0.1 µF capacitor as a reasonable
first estimate for the size of the external capacitor. Both OE implementations are shown in Figure 20 and
Figure 21.


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