TLC5971_15 Datasheet, PDF(20/45 Page) Texas Instruments – 12-Channel, 16-Bit, Enhanced Spectrum, PWM, RGB, LED Driver

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TLC5971_15 Datasheet, PDF (20/45 Pages) Texas Instruments – 12-Channel, 16-Bit, Enhanced Spectrum, PWM, RGB, LED Driver

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TLC5971

SBVS146D â AUGUST 2010 â REVISED DECEMBER 2015

www.ti.com

Table 3 summarizes the GS data values versus the output total ON-time and duty cycle. When the IC is powered

up, BLANK (bit 213) is set to 1 to force all outputs off; however, the 224-bit shift register and the 218-bit data

latch are not set to default values. Therefore, the GS data must be written to the data latch when BLANK (bit

213) is set to 0.

GS DATA

(DECIMAL)

8191

8192

8193

16383

16384

16385

24575

24576

24577

32765

32766

32767

Table 3. Output Duty Cycle and Total On-Time versus GS Data

GS DATA (HEX)

1FFF

2000

2001

3FFF

4000

4001

5FFF

6000

6001

7FFD

7FFE

7FFF

ON-TIME DUTY (%)

0.002

0.003

0.005

12.499

12.5

12.502

24.999

25.002

37.499

37.501

37.502

49.996

49.998

49.999

GS DATA

(DECIMAL)

32768

32769

32770

32771

40959

40960

40961

49149

49150

49151

57343

57344

57345

65533

65534

65535

GS DATA (HEX)

8000

8001

8002

8003

9FFF

A000

A001

BFFF

C000

C001

DFFF

E000

E001

FFFD

FFFE

FFFF

ON-TIME DUTY (%)

50.001

50.002

50.004

50.005

62.499

62.501

62.502

74.997

74.998

87.5

87.501

87.503

99.997

99.998

100

8.5.3 Enhanced Spectrum (ES) PWM Control

Enhanced spectrum (ES) PWM has the total display period divided into 128 display segments. The total display

period refers the period between the first grayscale clock input to the 65536th grayscale clock input after BLANK

(bit 213) is set to 0. Each display period has 512 grayscale values, maximum. Each output on-time changes

depending on the grayscale data. Refer to Table 4 for sequence information and Figure 27 for timing information.

GS DATA

(DEC)

GS DATA

(HEX)

0000h

0001h

0002h

0003h

0004h

0005h

0006h

Table 4. ES-PWM Drive Turnon Time Length

OUTn DRIVER OPERATION

Does not turn on

Turns on during one GS clock period in the 1st display period

Turns on during one GS clock period in the 1st and 65th display period

Turns on during one GS clock period in the 1st, 33rd, and 65th display period

Turns on during one GS clock period in the 1st, 33rd, 65th, and 97th display period

Turns on during one GS clock period in the 1st, 17th, 33rd, 65th, and 97th display period

Turns on during one GS clock period in the 1st, 17th, 33rd, 65th, 81st, and 97th display period

The number of display periods that OUTXn is turned on during one GS clock is incremented by the GS

data increasing in the following order. The order of display periods that the output turns on are:

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, and

128.

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