TLC5925_15 Datasheet, PDF (14/28 Pages) Texas Instruments – Low-Power 16-Channel Constant-Current LED Sink Driver

TLC5925
SLVS765B – OCTOBER 2008 – REVISED SEPTEMBER 2015
9 Application and Implementation
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NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
9.1.1 Turning on the LEDs
To turn on an LED connected to one of the outputs of the device, the output must be pulled low. To do this, the
SDI signal must let the device know which outputs should be activated. Using the rising edge of CLK, the logic
level of the SDI signal latches the desired state of each output into the shift register. Once this is complete, the
LE signal must be toggled from low to high then back to low. Once /OE is pulled down, the corresponding
outputs will be pulled low and the LEDs will be turned on. The below diagram shows outputs 0, 3, 4, 5, 10, 13,
and 15 being activated.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
CLK
OE 1
LE ₀
SDI
off
OUT0
on
off
OUT1
on
off
OUT2
on
off
OUT3
on
off
OUT15
on
SDO
Don't care
Figure 6. Timing Diagram
14
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