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| DS90UH926QSQE Datasheet, PDF (28/56 Pages) Texas Instruments – DS90UH926Q 720p 24-bit Color FPD-Link III Deserializer with HDCP | |||
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DS90UH926Q
SNLS337J â OCTOBER 2010 â REVISED APRIL 2013
www.ti.com
Serial Control Bus
The DS90UH926Q is configured by the use of a serial control bus that is I2C protocol compatible. . Multiple
deserializer devices may share the serial control bus since 16 device addresses are supported. Device address
is set via R1 and R2 values on IDx pin. See Figure 20 below.
The serial control bus consists of two signals and a configuration pin. The SCL is a Serial Bus Clock Input /
Output. The SDA is the Serial Bus Data Input / Output signal. Both SCL and SDA signals require an external
pull-up resistor to VDD33. For most applications a 4.7 k pull-up resistor to VDD33 may be used. The resistor value
may be adjusted for capacitive loading and data rate requirements. The signals are either pulled High, or driven
Low.
VDD33
HOST
or
Salve SCL
SDA
VDD33
R1
VR2
4.7k
4.7k
R2
IDx
SER
or
SCL DES
SDA
To other
Devices
Figure 20. Serial Control Bus Connection
The configuration pin is the IDx pin. This pin sets one of 16 possible device addresses. A pull-up resistor and a
pull-down resistor of suggested values may be used to set the voltage ratio of the IDx input (VR2) and VDD33 to
select one of the other 16 possible addresses. See Table 8.
#
Ideal Ratio
VR2 / VDD33
1
0
2
0.121
3
0.152
4
0.182
5
0.212
6
0.242
7
0.273
8
0.310
9
0.356
10
0.402
11
0.447
12
0.492
13
0.538
14
0.583
15
0.629
16
0.727
Table 8. Serial Control Bus Addresses for IDx
Ideal VR2
(V)
0
0.399
0.502
0.601
0.700
0.799
0.901
1.023
1.175
1.327
1.475
1.624
1.775
1.924
2.076
2.399
Suggested Resistor Suggested Resistor
R1 k⦠(1% tol)
R2 k⦠(1% tol)
Open
40.2 or Any
294
40.2
280
49.9
270
60.4
267
71.5
240
76.8
243
90.9
226
102
210
115
196
130
182
147
169
165
154
180
137
191
124
210
90.9
243
Address 7'b
0x2C
0x2D
0x2E
0x2F
0x30
0x31
0x32
0x33
0x34
0x35
0x36
0x37
0x38
0x39
0x3A
0x3B
Address 8'b
Appended
0x58
0x5A
0x5C
0x5E
0x60
0x62
0x64
0x66
0x68
0x6A
0x6C
0x6E
0x70
0x72
0x74
0x76
28
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Product Folder Links: DS90UH926Q
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