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TLC5949PWPR Datasheet(PDF) 20 Page - Texas Instruments |
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TLC5949PWPR Datasheet(HTML) 20 Page - Texas Instruments |
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20 / 51 page  TLC5949 SBVS219A – DECEMBER 2012 – REVISED DECEMBER 2012 www.ti.com Table 3 summarizes the GS data values versus the output on-time duty cycle. When the device powers up, the BLANK bit in the first control data latch is set to '1'. The 193-bit common shift register and the first and second GS data latches contain random data. Therefore, GS data must be written to the GS latches before the BLANK bit is set to '0'. All constant-current outputs are off when the BLANK bit is '1'. Table 3. Output Duty Cycle and On-Time versus GS Data GS DATA GS DATA DECIMAL HEX ON-TIME DUTY (%) DECIMAL HEX ON-TIME DUTY (%) 0 000h 0 2048 800h 50.001 1 001h 0.002 2049 801h 50.002 2 002h 0.003 2050 802h 50.004 3 003h 0.005 2051 803h 50.005 — — — — — — 511 1FFh 12.499 2559 9FFh 62.499 512 200h 12.500 2560 A00h 62.501 513 201h 12.502 2561 A01h 62.502 — — — — — — 1023 3FFh 24.999 3071 BFFh 74.997 1024 400h 25.000 3072 C00h 74.998 1025 401h 25.002 3073 C01h 75.000 — — — — — — 1535 5FFh 37.499 3583 DFFh 87.500 1536 600h 37.501 3584 E00h 87.501 1537 601h 37.502 3585 E01h 87.503 — — — — — — 2045 7FDh 49.996 4093 FFDh 99.997 2046 7FEh 49.998 4094 FFEh 99.998 2047 7FFh 49.999 4095 FFFh 100.000 Conventional PWM Control In this PWM control, the GS clock is enabled when the BLANK bit is set to '0'. The first GS clock rising edge after the BLANK bit is set to '0' increments the GS counter by one and switches on all outputs with a non-zero GS value programmed into the second GS data latch. Each additional GS clock rising edge increases the corresponding GS counter by one. The GS counter keeps track of the number of clock pulses from the GS clock inputs. Each output stays on while the counter is less than or equal to the programmed GS value. Each output turns off at the GS counter value rising edge when the counter becomes greater than the output GS latch value. Figure 22 illustrates the conventional PWM operation. 20 Submit Documentation Feedback Copyright © 2012, Texas Instruments Incorporated Product Folder Links: TLC5949 |
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