DS90UH926Q-Q1 Datasheet, PDF (31/58 Pages) Texas Instruments – 720p 24-Bit Color FPD-Link III Deserializer With HDCP

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DS90UH926Q-Q1
SNLS337K – OCTOBER 2010 – REVISED JANUARY 2015
7.5 Programming
7.5.1 Serial Control Bus
The DS90UH926Q-Q1 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 through the R₁ and R₂ values on IDx pin. See Figure 23.
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 V_DD33. For most applications a 4.7-k pullup resistor to V_DD33 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.
V_DD33
HOST
or
Salve _SCL
SDA
V_DD33
R₁
VR2
4.7k
4.7k
R₂
IDx
SER
or
SCL ^DES
SDA
To other
Devices
Figure 23. Serial Control Bus Connection
The configuration pin is the IDx pin. This pin sets one of 16 possible device addresses. A pullup resistor and a
pulldown resistor of suggested values may be used to set the voltage ratio of the IDx input (V_R2) and V_DD33 to
select one of the other 16 possible addresses. See Table 10.
NO.
Ideal Ratio
V_R2 / V_DD33
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 10. Serial Control Bus Addresses for IDx
Ideal V_R2
(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 kΩ (1% tol)
R2 kΩ (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
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