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| TLC59731 Datasheet, PDF (14/24 Pages) Texas Instruments – 3-Channel, 8-Bit, PWM LED Driver with Single-Wire Interface (EasySet) | |||
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TLC59731
SBVS222 â FEBRUARY 2013
www.ti.com
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 24-bit GS data latch. Figure 14 illustrates the PWM
operation timing.
Grayscale
Reference Clock, GSCLK
(Internal)
12 34 56
13 15 17
14 16
110
113
116
111
114 117
112
115
118
1886 1889 1892 1895 1898 1901
1887 1890 1893 1896 1899 1902
1888 1891 1894 1897 1900 1903
OUTn
(GSDATA = 0)
OFF
ON
(VOUTnH)
(VOUTnL)
No river
turns on.
T = GSCLK ´ 1
OFF
OUTn
(GSDATA = 1) ON
T = GSCLK ´ 3
OFF
OUTn
(GSDATA = 2) ON
T = GSCLK ´ 5
OFF
OUTn ON
(GSDATA = 3)
OFF
OUTn ON
(GSDATA = 7)
OFF
OUTn ON
(GSDATA = 8)
T = GSCLK ´ 13
T = GSCLK ´ 17
OFF
OUTn
(GSDATA = 31) ON
OFF
OUTn
(GSDATA = 32) ON
T = GSCLK ´ 109
T = GSCLK ´ 117
OFF
OUTn
(GSDATA = 253) ON
OFF
OUTn
(GSDATA = 254
ON
OFF
OUTn
(GSDATA = 255)
ON
T = GSCLK ´ 1885
T = GSCLK ´ 1893
T = GSCLK ´ 1901
(1) Actual on-time differs from the ideal on-time.
Figure 14. PWM Operation
T = GSCLK ´ 1
14
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