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The UCS1903N sends signals in return to zero codes with a single-wire communication
method. When the power-on reset is completed, the UCS1903N receives the data from the DIN pin.
When all the 24 bits of data have been received, IC no longer receive data ，the DOUT port starts to
forward the data to the next chip as its input data. The DOUT pin is held LOW before the data
forwarding,. The three PWM output ports, OUTR, OUTG and OUTB, drive Duty ratio output in a
0.6-ms period corresponding to the 24-bit data received before。If the input data from the DIN pin is a
RESET code , the UCS1903N will drive the newest received 24-bit data for display. When the reset
code is completed, the UCS1903N will start receive the new 24-bit data. When 24 bits of data have
been received, the UCS1903N will forward the data through the DOUT pin. Before the RESET signal
is received, the output at the OUTR, OUTG and OUTB pins will remain unchanged. When a low level
RESET code longer than 24μs is received, the UCS1903N will drive Duty ratio output corresponding to the newest 24-bit data received.