TLC5947 Datasheet, PDF (14/27 Pages) Texas Instruments – 24-Channel, 12-Bit PWM LED Driver with

TLC5947
SBVS114A – JULY 2008 – REVISED SEPTEMBER 2008 ................................................................................................................................................. www.ti.com
BLANK
Counter Value
Internal
Oscillator
Clock
OUTn OFF
(GS Data = 000h) _ON
OUTn ^OFF
(GS Data = 001h) _ON
OUTn ^OFF
(GS Data = 002h) _ON
OUTn ^OFF
(GS Data = 003h) _ON
000012 3
64 66
63 65
1027 1030
2049 2052
1026 1029
2048 2051
1025 1028 1031 2047 2050
3073 3076
3072 3075
3071 3074 3077
4096
4095
4094
12
Grayscale counter starts to count from 5th clock of the internal oscillator clock after BLANK goes low.
Drivers do not turn on when grayscale data are ‘0’.
T = Internal CLK ´ 1
Dotted line indicates BLANK is high.
T = Internal CLK ´ 2
T = Internal CLK ´ 3
OUTn ^OFF
(GS Data = 03Fh) _ON
OUTn ^OFF
(GS Data = 040h) _ON
OUTn ^OFF
(GS Data = 041h) _ON
T = Internal
CLK ´ 63
T = Internal CLK ´ 64
T = Internal CLK ´ 65
OUTn ^OFF
(GS Data = 400h) _ON
OUTn ^OFF
(GS Data = 401h) _ON
T = Internal CLK ´ 1024
T = Internal CLK ´ 1025
OUTn ^OFF
(GS Data = 800h) _ON
T = Internal CLK ´ 2048
OUTn ^OFF
(GS Data = C00h) _ON
T = Internal CLK ´ 3072
OUTn ^OFF
(GS Data = FFEh) _ON
OUTn ^OFF
(GS Data = FFFh) _ON
T = Internal CLK ´ 4094
T = Internal CLK ´ 4095
Figure 18. PWM Operation
14
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