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| DS90UB921-Q1 Datasheet, PDF (27/57 Pages) Texas Instruments – 5 - 96 MHz 24-bit Color FPD-Link III Serializer with Bidirectional Control Channel | |||
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DS90UB921-Q1
SNLS488 â MARCH 2016
7.5 Programming
The DS90UB921-Q1 is configured by the use of a serial control bus that is I2C protocol compatible. Multiple
serializer devices may share the serial control bus since 9 device addresses are supported. Device address is
set via R1 and R2 values on IDx pin. See Figure 22.
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
Slave SCL
SDA
VDD33
R1
VR2
4.7k
4.7k
R2
IDx
DS90UB921-Q1
SCL
SDA
To other
Devices
Figure 22. Serial Control Bus Connection
The configuration pin is the IDx pin. This pin sets one of 8 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 8 possible addresses. The voltage range in between the Minimum and Maximum VR2
must be adhered even when taking resistor tolerances into account. The 1% suggested resistors meet this for all
cases, but others that also meet the desired voltage range are also acceptable. See Table 6.
Table 6. Serial Control Bus Addresses for IDx
#
Minimum Voltage
VR2 (V) (1)
Maximum Voltage
VR2
(V) (1)
Suggested Resistor Suggested Resistor
R1 k⦠(1% tol)
R2 k⦠(1% tol)
Address 7'b
1
0.000
0.150
Open
40.2 or Any
0x0C
2
0.535
0.578
86.6
17.4
0x0E
3
0.723
0.775
90.9
26.7
0x10
4
0.947
0.995
71.5
30.1
0x12
5
1.203
1.258
84.5
49.9
0x14
6
1.493
1.565
54.9
47.5
0x16
7
1.789
1.855
78.7
97.6
0x18
8
2.469
2.515
30.9
95.3
0x1A
(1) Voltage indicated assumes nominal VDD33.
Address 8'b
Appended
0x18
0x1C
0x20
0x24
0x28
0x2C
0x30
0x34
Copyright © 2016, Texas Instruments Incorporated
Product Folder Links: DS90UB921-Q1
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