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| TLC5973 Datasheet, PDF (15/34 Pages) Texas Instruments – TLC5973 3-Channel, 12-Bit, PWM Constant-Current LED Driver with Single-Wire Interface (EasySet) | |||
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www.ti.com
TLC5973
SBVS225B â MARCH 2013 â REVISED MAY 2014
8.4.1.1 PWM Control
The GS counter keeps track of the number of grayscale reference clocks (GSCLKs) from the internal oscillator.
Each output stays on while the counter is less than or equal to the programmed GS value. Each output turns off
when the GS counter is greater than the GS value in the 36-bit GS data latch. Figure 13 illustrates the PWM
operation timing.
Grayscale
Reference Clock, GSCLK
(Internal)
12 34
2047
2048
2049
4094
1
4095
4096
OUTn
(GSDATA = 0)
OFF (VOUTnH)
ON (VOUTnL)
OUTn OFF
(GSDATA = 1) ON
OUTn OFF
(GSDATA = 2) ON
OUTn OFF
(GSDATA = 3) ON
No driver turns on.
t = GSCLK x 1
t = GSCLK x 2
t = GSCLK x 3
OUTn OFF
(GSDATA = 2046) ON
OUTn OFF
(GSDATA = 2047) ON
OUTn OFF
(GSDATA = 2048) ON
t = GSCLK x 2046
t = GSCLK x 2047
t = GSCLK x 2048
OUTn OFF
(GSDATA = 4093) ON
t = GSCLK x 4093
OUTn OFF
(GSDATA = 4094) ON
t = GSCLK x 4094
OUTn OFF
(GSDATA = 4095) ON
t = GSCLK x 4095
(1) Actual on-time differs from the ideal on-time.
Figure 13. PWM Operation
t = GSCLK x 1
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