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| DS90UH925Q Datasheet, PDF (24/47 Pages) Texas Instruments – 720p 24-bit Color FPD-Link III Serializer with HDCP | |||
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DS90UH925Q
Serial Control Bus
The DS90UH925Q is configured by the use of a serial control bus that is I2C protocol compatible. This bus is also used by the Host
source to control and monitor status of the HDCP function. Multiple serializer 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 17 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 appli-
cations 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.
FIGURE 17. Serial Control Bus Connection
30136301
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 6.
TABLE 5. Serial Control Bus Addresses for IDx
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
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 R1 kâ¦
(1% tol)
Open
294
280
270
267
240
243
226
210
196
182
169
154
137
124
90.9
Suggested
Resistor R2 kâ¦
(1% tol)
40.2 or Any
40.2
49.9
60.4
71.5
76.8
90.9
102
115
130
147
165
180
191
210
243
Address 7'b
0x0C
0x0D
0x0E
0x0F
0x10
0x11
0x12
0x13
0x14
0x15
0x16
0x17
0x18
0x19
0x1A
0x1B
Address 8'b
Appended
0x18
0x1A
0x1C
0x1E
0x20
0x22
0x24
0x26
0x28
0x2A
0x2C
0x2E
0x30
0x32
0x34
0x36
24
Copyright © 1999-2012, Texas Instruments Incorporated
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