DS90UH949-Q1 Datasheet, PDF (34/87 Pages) Texas Instruments – 1080p HDMI to FPD-Link III Bridge Serializer with HDCP

DS90UH949-Q1
SNLS453 – NOVEMBER 2014
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If the DS90UH949-Q1 detects two independent devices, it will operate in Replicate mode, sending the single
channel video on both connections. If the device detects a device on the secondary link, but not the first, it can
send the video only on the second link.
Auto-detection can be disabled to allow forced modes of operation using the Dual Link Control Register
(DUAL_CTL1).
8.5 Programming
8.5.1 Serial Control Bus
This serializer may also be configured by the use of a I2C compatible serial control bus. Multiple devices may
share the serial control bus (up to 8 device addresses supported). The device address is set via a resistor divider
(R1 and R2 — see Figure 21 below) connected to the IDx pin.
VDD18
HOST
SCL
SDA
VDDI2C
R1
VR2
IDx
4.7k
4.7k
R2
SER
SCL
SDA
To other
Devices
Figure 21. Serial Control Bus Connection
The serial control bus consists of two signals, SCL and SDA. SCL is a Serial Bus Clock Input. SDA is the Serial
Bus Data Input / Output signal. Both SCL and SDA signals require an external pull-up resistor to V_DD18 or V_DD33.
For most applications, a 4.7kΩ pull-up resistor is recommended. However, the pull-up resistor value may be
adjusted for capacitive loading and data rate requirements. The signals are either pulled High, or driven Low.
The IDx pin configures the control interface to one of 8 possible device addresses. A pull-up resistor and a pull-
down resistor may be used to set the appropriate voltage on the IDx input pin See Table 10 below.
#
Ratio
V_R2 / V_DD18
1
0
2
0.208
3
0.323
4
0.440
5
0.553
6
0.668
7
0.789
8
1
Table 9. Serial Control Bus Addresses For IDx
Ideal V_R2
(V)
0
0.374
0.582
0.792
0.995
1.202
1.420
1.8
Suggested Resistor Suggested Resistor
R1 kΩ (1% tol)
R2 kΩ (1% tol)
OPEN
40.2
118
30.9
107
51.1
113
88.7
82.5
102
68.1
137
56.2
210
13.3
OPEN
7-Bit Address
0x0C
0x0E
0x10
0x12
0x14
0x16
0x18
0x1A
8-Bit Address
0x18
0x1C
0x20
0x24
0x28
0x2C
0x30
0x34
34
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