TLC5973 Datasheet, PDF (14/34 Pages) Texas Instruments – TLC5973 3-Channel, 12-Bit, PWM Constant-Current LED Driver with Single-Wire Interface (EasySet)

TLC5973
SBVS225B – MARCH 2013 – REVISED MAY 2014
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Device Functional Modes (continued)
Table 2 summarizes the GS data values versus the output ideal on-time duty cycle. Furthermore, actual on-time
differs from the ideal on-time because the output drivers and control circuit have some timing delay. When the
device is powered on, all outputs are forced off and remain off until the non-zero GS data are written to the 36-bit
GS data latch.
Table 2. Output Duty Cycle and Total On-Time versus GS Data
GS DATA
DECIMAL
0
1
2
—
255
256
257
—
511
512
513
—
1023
1024
1025
—
2047
2048
2049
—
4093
4094
4095
HEX
0
1
2
—
0FE
0FF
100
—
1FF
200
201
—
3FF
400
401
—
7FF
800
801
—
FFD
FFE
FFF
NO. OF GSCLKs
OUTn TURNS ON
Off
1
1
—
1
1
1
—
1
1
1
—
1
1
1
—
1
1
1
—
1
1
1
NO. OF GSCLKs
OUTn TURNS OFF
Off
2
3
—
256
257
258
—
512
513
514
—
1024
1025
1026
—
2048
2049
2050
—
4094
4095
4096
TOTAL IDEAL TIME
(µs)
0
0.08
0.17
—
21.25
21.33
21.42
—
42.58
42.67
42.75
—
85.25
85.33
85.42
—
170.6
170.7
170.8
—
341.1
341.2
341.3
ON-TIME DUTY (%)
0
0.02
0.05
—
6.23
6.25
6.27
—
12.48
12.50
12.52
—
24.98
25.00
25.00
—
49.98
50.00
50.02
—
99.93
99.95
99.98
14
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