TLC5955 Datasheet, PDF (18/53 Pages) Texas Instruments – TLC5955 48-Channel, 16-Bit, PWM LED Driver with DC, BC, LED Open-Short Detection, and Internal Current Setting

TLC5955
SBVS237 – MARCH 2014
Feature Description (continued)
SOUT
Common Shift Register (769 Bits)
MSB
Latch
Select
Bit
Common Common Common Common Common
Data Bit Data Bit Data Bit Data Bit Data Bit
767
766
765
764
763
768
767
766
765
764
763
LSB
Common Common Common Common Common Common
Data Bit Data Bit Data Bit Data Bit Data Bit Data Bit
5
4
3
2
1
0
5
4
3
2
1
0
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SIN
SCLK
Bits 767:0
Lower 768 Bits
Grayscale (GS) Data Latch (768 Bits)
768 Bits
MSB
767
752
48
47
32
31
LSB
16
15
0
OUTB15
Bit 15
OUTB15
Bit 0
OUTR1 OUTB0
Bit 0
Bit 15
OUTB0 OUTG0
Bit 0
Bit 15
OUTG0 OUTR0
Bit 0
Bit 15
OUTR0
Bit 0
GS data for OUTB15
GS data for OUTB0
GS data for OUTG0
GS data for OUTR0
Bits 335:0
Bits 344:336
768 Bits
To Grayscale Timing Control Circuit
The latch pulse
comes from LAT
when the MSB of
the common shift
register is 0 and the
RFRESH bit is 0.
When the REFRESH
bit is 1, the latch
pulse is input at the
65536th GS clock
after the LAT input.
Bits 370:345
Bits 767:760
MSB
LSB
767 --- 760
8-Bit Command
Decoder LAT
(96h)
RESET
from
UVLO
9–Bit
Previous
MC data
Bits
Bits
Bits
344:342 341:339 338:336
LatMC
MSB - 366
370:366 365:359 358:352 351:345
FUNC
Bits 4:0
BRIGHT
Bits 6:0,
OUTBn
BRIGHT
Bits 6:0,
OUTGn
BRIGHT
Bits 6:0,
OUTRn
FC, 5 Bits
BC, 21 Bits
344:342 341:339 ^338:336 335:329 328:322
Max
Current
OUTBn
Max
Current
OUTGn
Max DOTCOR DOTCOR
Current Bits 6:0, Bits 6:0,
OUTRn OUTB15 OUTG15
MC, 9 Bits
DC, 336 Bits
Control Data
Latch (371 Bits)
LSB
6:0
DOTCOR
Bits 6:0,
OUTR0
336 Bits
5 Bits
21 Bits
9 Bits
335:329 335:322
DOTCOR DOTCOR
Bits 6:0, Bits 6:0,
OUTB15 OUTG15
LSB
6:0
DOTCOR
Bits 6:0,
OUTR0
DC, 336 Bits
The latch pulse
DC
Data
Latch
(336
Bits)
comes from LAT
when the MSB of
the common shift
336 Bits
register is 1.
To Control Logic
To BC Circuit
To Output Current
Reference Circuit
To Dot Correction Circuit
Figure 21. Common Shift Register and Data Latches Configuration
8.3.2.1 769-Bit Common Shift Register
The 769-bit common shift register is used to shift data from the SIN terminal into the TLC5955. The data shifted
into the register are used for GS, DC, maximum output current, global BC functions, and function control data
write operations. The common shift register LSB is connected to SIN and the MSB is connected to SOUT. On
each SCLK rising edge, the data on SIN are shifted into the LSB and all 769 bits are shifted towards the MSB.
The register MSB is always connected to SOUT. When the device is powered up, the data in the 769-bit
common shift register are random.
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