TLC5955 Datasheet, PDF (19/53 Pages) Texas Instruments – TLC5955 48-Channel, 16-Bit, PWM LED Driver with DC, BC, LED Open-Short Detection, and Internal Current Setting

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TLC5955
SBVS237 – MARCH 2014
Feature Description (continued)
8.3.2.2 Grayscale (GS) Data Latch
The GS data latch is 768 bits long, and sets the PWM timing for each constant-current output. The on-time of all
constant-current outputs is controlled by the data in this data latch. The 768-bit GS data in the common shift
register are copied to the data latch at a LAT rising edge when the common shift resister MSB is 0.
When the device is powered up, the data are random and all constant-current outputs are forced off. However,
no outputs turn on until GS data are written to the GS data latch even if a GSCLK is input. The data bit
assignment is shown in Table 1. Refer to Figure 22 for a GS data write timing diagram.
GS DATA
LATCH BIT
NUMBER
15-0
31-16
47-32
63-48
79-64
95-80
111-96
127-112
143-128
159-144
175-160
191-176
207-192
223-208
239-224
255-240
271-256
287-272
303-288
319-304
335-320
351-336
367-352
383-368
BIT NAME
GSR0[15:0]
GSG0[15:0]
GSB0[15:0]
GSR1[15:0]
GSG1[15:0]
GSB1[15:0]
GSR2[15:0]
GSG2[15:0]
GSB2[15:0]
GSR3[15:0]
GSG3[15:0]
GSB3[15:0]
GSR4[15:0]
GSG4[15:0]
GSB4[15:0]
GSR5[15:0]
GSG5[15:0]
GSB5[15:0]
GSR6[15:0]
GSG6[15:0]
GSB6[15:0]
GSR7[15:0]
GSG7[15:0]
GSB7[15:0]
Table 1. Grayscale Data Latch Bit Description
DEFAULT
VALUE
N/A
(no default
value)
CONTROLLED
CHANNEL
Bits[15:0] for OUTR0
Bits[15:0] for OUTG0
Bits[15:0] for OUTB0
Bits[15:0] for OUTR1
Bits[15:0] for OUTG1
Bits[15:0] for OUTB1
Bits[15:0] for OUTR2
Bits[15:0] for OUTG2
Bits[15:0] for OUTB2
Bits[15:0] for OUTR3
Bits[15:0] for OUTG3
Bits[15:0] for OUTB3
Bits[15:0] for OUTR4
Bits[15:0] for OUTG4
Bits[15:0] for OUTB4
Bits[15:0] for OUTR5
Bits[15:0] for OUTG5
Bits[15:0] for OUTB5
Bits[15:0] for OUTR6
Bits[15:0] for OUTG6
Bits[15:0] for OUTB6
Bits[15:0] for OUTR7
Bits[15:0] for OUTG7
Bits[15:0] for OUTB7
GS DATA
LATCH BIT
NUMBER
399-384
415-400
431-416
447-432
463-448
479-464
495-480
511-496
527-512
543-528
559-544
575-560
591-576
607-592
623-608
639-624
655-640
671-656
687-672
703-688
719-704
735-720
751-736
767-752
BIT NAME
GSR8[15:0]
GSG8[15:0]
GSB8[15:0]
GSR9[15:0]
GSG9[15:0]
GSB9[15:0]
GSR10[15:0]
GSG10[15:0]
GSB10[15:0]
GSR11[15:0]
GSG11[15:0]
GSB11[15:0]
GSR12[15:0]
GSG12[15:0]
GSB12[15:0]
GSR13[15:0]
GSG13[15:0]
GSB13[15:0]
GSR14[15:0]
GSG14[15:0]
GSB14[15:0]
GSR15[15:0]
GSG15[15:0]
GSB15[15:0]
DEFAULT
VALUE
N/A
(no default
value)
CONTROLLED
CHANNEL
Bits[15:0] for OUTR8
Bits[15:0] for OUTG8
Bits[15:0] for OUTB8
Bits[15:0] for OUTR9
Bits[15:0] for OUTG9
Bits[15:0] for OUTB9
Bits[15:0] for OUTR10
Bits[15:0] for OUTG10
Bits[15:0] for OUTB10
Bits[15:0] for OUTR11
Bits[15:0] for OUTG11
Bits[15:0] for OUTB11
Bits[15:0] for OUTR12
Bits[15:0] for OUTG12
Bits[15:0] for OUTB12
Bits[15:0] for OUTR13
Bits[15:0] for OUTG13
Bits[15:0] for OUTB13
Bits[15:0] for OUTR14
Bits[15:0] for OUTG14
Bits[15:0] for OUTB14
Bits[15:0] for OUTR15
Bits[15:0] for OUTG15
Bits[15:0] for OUTB15
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