DS90UB925Q-Q1 Datasheet, PDF (25/51 Pages) Texas Instruments – 5 to 85 MHz 24-Bit Color FPD-Link III Serializer With Bidirectional Control Channel

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DS90UB925Q-Q1
SNLS407D – APRIL 2012 – REVISED OCTOBER 2014
7.4.2.2 Repeater Connections
The Repeater requires the following connections between the Receiver and each Transmitter Figure 18.
1. Video Data – Connect PCLK, RGB and control signals (DE, VS, HS).
2. I2C – Connect SCL and SDA signals. Both signals should be pulled up to V_DD33 with 4.7 kΩ resistors.
3. Audio – Connect I2S_CLK, I2S_WC, and I2S_DA signals.
4. IDx pin – Each Transmitter and Receiver must have an unique I2C address.
5. MODE_SEL pin – All Transmitter and Receiver must be set into the Repeater Mode.
6. Interrupt pin – Connect DS90UB926Q-Q1 INTB_IN pin to DS90UB925Q-Q1 INTB pin. The signal must be
pulled up to V_DDIO.
DS90UB926Q-Q1
DS90UB925Q-Q1
RGB[7:0) / ROUT[23:0]
DIN[23:0] / RGB[7:0]
DE
VS
HS
VDD33
MODE_SEL
I2S_CLK
I2S_WC
I2S_DA
VDD33
ID[x]
INTB_IN
SDA
SCL
Optional
VDDIO
Optional
VDD33
DE
VS
HS
I2S_CLK
I2S_WC
I2S_DA
MODE_SEL
VDD33
INTB
SDA
SCL
VDD33
ID[x]
Figure 18. Repeater Connection Diagram
7.5 Programming
The DS90UB925Q-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 19.
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 pull-up 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.
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