THL3514 Datasheet, PDF (13/16 Pages) THine Electronics, Inc. – The THL3514 is an LED driver with 24 channel constant

THL3514_Rev.1.01_E
Individual Brightness Control
The Brightness for each LED output channel (OUT0-OUT23) are individually programmable in 256 steps by the register
configuration (R01-R15). The individual Brightness is controlled by PWM duty cycle.
The ratio of ON time for the constant current outputs is expressed in the following equation.
ON time ratio = Individual Brightness Control Register Value / 256
The bigger setting value results in the larger ON time ratio, therefore higher brightness. When the register value is 0, the
output current sink is held OFF, therefore the LED turns off.
Individual Brightness:255
ON Dugy=255/256
Individual Brightness:254
ON Dugy =254/256
Individual Brightness:2
ON Dugy=2/256
Individual Brightness:1
ON Dugy =1/256
Individual Brightness:0
ON Dugy =0/256
< Individual Brightness Control >
approximately 290μs
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
PWM Phase Control Mode
The PWM pulse start position of each channel is controlled in different phases to reduce switching noise.
The phase control mode is selectable in 2 ways by the register configuration (R00[7]).
In normal mode (R00[7]=0), the PWM pulse start positions of all channels are different from each other.
In group control mode (R00[7]=1), the PWM pulse start positions of 2 or 3 channel groups are different from each other.
< PWM Phase Control Mode >
Normal Mode(R00[7]=0)
OUT0
ON
OUT1
ON
OUT2
ON
ON
ON
ON
Delay
Delay
Delay
Delay
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