DS90UB903Q Datasheet, PDF (27/41 Pages) Texas Instruments – 10 - 43MHz 18 Bit Color FPD-Link III Serializer and Deserializer with Bidirectional Control Channel

mitted by releasing the output and allowing it to be pulled-up
externally. The appropriate pull-up resistor values will depend
upon the total bus capacitance and operating speed. The
DS90UB903Q/904Q I²C bus data rate supports up to 100
kbps according to I²C specification.
To start any data transfer, the DS90UB903Q/904Q must be
configured in the proper I²C mode. Each device can function
as an I²C slave proxy or master proxy depending on the mode
determined by MODE pin. The Ser/Des interface acts as a
virtual bridge between Master Controller Unit (MCU) and the
remote device. When the MODE pin is set to High, the device
is treated as a slave proxy; acts as a slave on behalf of the
remote slave. When addressing a remote peripheral or Seri-
alizer/Deserializer (not wired directly to the MCU), the slave
proxy will forward any byte transactions sent by the Master
controller to the target device. When MODE pin is set to Low,
the device will function as a master proxy device; acts as a
master on behalf of the I²C master controller. Note that the
devices must have complementary settings for the MODE
configuration. For example, if the Serializer MODE pin is set
to High then the Deserializer MODE pin must be set to Low
and vice-versa.
FIGURE 23. Write Byte
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FIGURE 24. Read Byte
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FIGURE 25. Basic Operation
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