TLC5951 Datasheet, PDF (26/46 Pages) Texas Instruments – 24-Channel, 12-Bit PWM LED Driver with 7-Bit Dot Correction and 3-Group, 8-Bit Global Brightness Control

TLC5951
SBVS127B – MARCH 2009 – REVISED DECEMBER 2009
PWM Counter 8-, 10-, or 12-Bit Mode Without Auto Repeat
XBLNK
GSCKR
GSCKG
GSCKB
PWM 8-Bit Mode
(FC Bit 1/0 = 1/1)
OUTRn/Gn/Bn
(GSDATA = FFFh)
PWM 10-Bit Mode
(FC Bit 1/0 = 1/0)
OUTRn/Gn/Bn
(GSDATA = FFFh)
PWM 12-Bit Mode
(FC Bit 1/0 = 0/X)
OUTRn/Gn/Bn
(GSDATA = FFFh)
1 2 34 ¼
255
256
257
¼
¼
1023
1024
1025
¼
GS counter starts to count GSCKR/G/B after XBLNK goes high.
4095
4096
4097
¼
OFF (V_OUTRn/Gn/BnH)
T = GSCKR/G/B ´ 255
ON (V_OUTRn/Gn/Bn)
OUTRn/Gn/Bn is forced off even if GS data is greater than 0FFh.
OUTRn/Gn/Bn does not turn on again until XBLNK goes low.
OFF (V_OUTXnH)
ON (V_OUTRn/Gn/Bn)
T = GSCKR/G/B ´ 1023
OUTRn/Gn/Bn is forced off even if GS data are greater than 3FFh.
OUTRn/Gn/Bn does not turn on again until XBLNK goes low.
OFF (V_OUTXnH)
ON (V_OUTRn/Gn/Bn)
T = GSCKR/G/B ´ 4095
Figure 42. PWM Operation 2
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1 2 34 ¼
PWM Counter 8-, 10-, or 12-Bit Mode With Auto Repeat
XBLNK
GSCKR
GSCKG
GSCKB
1023
4095
4095
4095
256
1024
4096
4096
4096
1 2 3 ^¼ 255 257 ^¼
1025 ^¼
1 2^¼
1 2^¼
1 2^¼
1
¼
¼
¼
¼
¼
¼
GS counter starts to count GSCKR/G/B after XBLNK goes high.
PWM 8-Bit Mode
(FC Bit 1/0 = 1/1)
OUTRn/Gn/Bn
(GSDATA = 0FFh to FFFh)
OFF
ON
T=
GSCKR/G/B ´ 255
T = GSCKR/G/B ´ 1
PWM 10-Bit Mode
(FC Bit 1/0 = 1/0)
OUTRn/Gn/Bn
(GSDATA = 3FFh to FFFh)
OUTRn/Gn/Bn is forced off even if x2 of off period
GS data are greater than 0FFh. is generated.
OFF
ON
T = GSCKR/G/B ´ 1023
x11 of off period
is generated.
x15 of off period
is generated.
PWM 12-Bit Mode
(FC Bit 1/0 = 0/X)
OUTRn/Gn/Bn
(GSDATA = FFFh)
OFF
ON
OUTRn/Gn/Bn is forced off even if
GS data are greater than 3FFh.
T = GSCKR/G/B ´ 4095
x2 of off period
is generated.
x3 of off period
is generated.
Figure 43. PWM Operation 3
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