TLC5943 Datasheet, PDF (17/34 Pages) Texas Instruments – 16-Channel, 16-Bit PWM LED Driver with 7-Bit Global Brightness Control

TLC5943
www.ti.com
SBVS101 – DECEMBER 2007
Grayscale (GS) Function (Enhanced Spectrum PWM Operation)
The TLC5943 has an enhanced spectrum pulse-width modulation (ES PWM) function. In this PWM control, the
total display period is divided to 128 display segments. Total display period means the timing from the first
grayscale clock (GSCLK) input to the 65,536th grayscale clock input after BLANK goes low. Each display period
has 512 grayscale as a maximum. The driver (OUTn) on time changes depending on the 16-bit grayscale data.
Refer to Table 3 for sequence information and Figure 23 for timing information.
GS DATA (Dec)
0
1
2
3
4
5
6
---
127
128
129
---
255
256
257
---
65478
65279
65280
---
65534
65535
Table 3. ES PWM Drive Turn-On Time Length
GS DATA (Hex)
0000h
0001h
0002h
0003h
0004h
0005h
0006h
---
007Fh
0080h
0081h
---
00FFh
0100h
0101h
---
FEFFh
FF00h
FF01h
---
FFFEh
FFFFh
OUTn DRIVER OPERATION
No turn on
Turns on during 1GSCLK period in first display period
Turns on during 1GSCLK period in first and 65th display periods
Turns on during 1GSCLK period in first, 65th, and 33rd display periods
Turns on during 1GSCLK period in first, 65th, 33rd, and 97th display periods
Turns on during 1GSCLK period in first, 65th, 33rd, 97th, and 17th display periods
Turns on during 1GSCLK period in first, 65th, 33rd, 97th, 17th, and 81st display
periods
The number of display periods in which OUTn turns on during 1GSCLK is
increased by GS data increasing in the following order.
The display period order in which OUTn turns on :
1>65>33>97>17>81>49>113>9>73>41>105>25>89>57>121>5>69>37>101>21>
85>53>117>13>77>45>109>29>93>61>125>3>67>35>99>19>83>51>115>11>
75>43>107>27>91>59>123>7>71>39>103>23>87>55>119>15>79>47>111>31>
95>63>127>2>66>34>98>18>82>50>114>10>74>42>106>26>90>58>122>6>70>
38>102>22>86>54>118>14>78>46>110>30>94>62>126>4>68>36>100>20>84>
52>116>12>76>44>108>28>92>60>124>8>72>40>104>24>88>56>120>16>80>
48>112>32>96>64>128.
Turns on during 1GSCLK period in first through 127th display period. No turn on in
128th display period only.
Turns on during 1GSCLK period in all (1 through 128th) display periods.
Turns on during 2GSCLK periods in first display period and 1GSCLK period in
other display periods.
The number of display periods in which OUTn turns on during 2GSCLKs increases
by GS data as when GS is 130 through 254.
Turns on during 2GSCLKs period in 1 through 127th display period and turns on
1GSCLK period in 128th display period only.
Turns on during 2GSCLK periods in all (1 through 128th) display periods.
Turns on during 3GSCLK periods in first display period and 2GSCLK periods in
other display periods.
Display period in which OUTn turn-on time increases by GS data, increasing as
does above operation
Turns on during 511 GSCLK period in 1 through 127th display period and turns on
510 GSCLK period in 128th display period only.
Turns on during 511 GSCLK period in all (1 through 128th) display periods.
Turns on during 512 GSCLK period in first display period + 511 GSCLK period in
second through 128th display period.
Display period in which OUTn turn-on time increases by GS data, increasing as
does above operation
Turns on during 512 GSCLK period in first through 63rd and 65th through 127th
display period, and turns on 511 GSCLK period in 64th and 128th display periods.
Turns on during 512 GSCLK period in first through 127th display periods, and turns
on 511 GSCLK period in 128th display period only.
Copyright © 2007, Texas Instruments Incorporated
Product Folder Link(s): TLC5943
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