TLC5955 Datasheet, PDF (22/53 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
www.ti.com
8.3.2.4 Dot Correction (DC) Data Latch
DC data are 336 bits long; the data for each constant-current output are controlled by seven bits. Each constant-
current output DC is controlled by the DC data latch. Each DC value individually adjusts the output current for
each constant-current output. As explained in the Dot Correction (DC) Function section, the DC values are used
to adjust the output current from 26.2% to 100% of the current value set by MC and BC data. When the device is
powered on, the data in the DC data latch are random.
The DC data bit assignment is shown in Table 2. See Table 9 for a summary of the DC data value versus set
current value.
CONTROL
DATA LATCH
BIT NUMBER
6-0
13-7
20-14
27-21
34-28
41-35
48-42
55-49
62-56
69-63
76-70
83-77
90-84
97-91
104-98
111-105
118-112
125-119
132-126
139-133
146-140
153-147
160-154
167-161
BIT NAME
DCR0[6:0]
DCG0[6:0]
DCB0[6:0]
DCR1[6:0]
DCG1[6:0]
DCB1[6:0]
DCR2[6:0]
DCG2[6:0]
DCB2[6:0]
DCR3[6:0]
DCG3[6:0]
DCB3[6:0]
DCR4[6:0]
DCG4[6:0]
DCB4[6:0]
DCR5[6:0]
DCG5[6:0]
DCB5[6:0]
DCR6[6:0]
DCG6[6:0]
DCB6[6:0]
DCR7[6:0]
DCG7[6:0]
DCB7[6:0]
Table 2. Dot Correction Data Bit Description
DEFAULT
VALUE
N/A
(no default
value)
CONTROLLED
CHANNEL
DC bits[6:0] for OUTR0
DC bits[6:0] for OUTG0
DC bits[6:0] for OUTB0
DC bits[6:0] for OUTR1
DC bits[6:0] for OUTG1
DC bits[6:0] for OUTB1
DC bits[6:0] for OUTR2
DC bits[6:0] for OUTG2
DC bits[6:0] for OUTB2
DC bits[6:0] for OUTR3
DC bits[6:0] for OUTG3
DC bits[6:0] for OUTB3
DC bits[6:0] for OUTR4
DC bits[6:0] for OUTG4
DC bits[6:0] for OUTB4
DC bits[6:0] for OUTR5
DC bits[6:0] for OUTG5
DC bits[6:0] for OUTB5
DC bits[6:0] for OUTR6
DC bits[6:0] for OUTG6
DC bits[6:0] for OUTB6
DC bits[6:0] for OUTR7
DC bits[6:0] for OUTG7
DC bits[6:0] for OUTB7
CONTROL
DATA LATCH
BIT NUMBER
174-168
181-175
188-182
195-189
202-196
209-203
216-210
223-217
230-224
237-231
244-238
251-245
258-252
265-259
272-266
279-273
286-280
293-287
300-294
307-301
314-308
321-315
328-322
335-329
BIT NAME
DCR8[6:0]
DCG8[6:0]
DCB8[6:0]
DCR9[6:0]
DCG9[6:0]
DCB9[6:0]
DCR10[6:0]
DCG10[6:0]
DCB10[6:0]
DCR11[6:0]
DCG11[6:0]
DCB11[6:0]
DCR12[6:0]
DCG12[6:0]
DCB12[6:0]
DCR13[6:0]
DCG13[6:0]
DCB13[6:0]
DCR14[6:0]
DCG14[6:0]
DCB14[6:0]
DCR15[6:0]
DCG15[6:0]
DCB15[6:0]
DEFAULT
VALUE
N/A
(no default
value)
CONTROLLED
CHANNEL
DC bits[6:0] for OUTR8
DC bits[6:0] for OUTG8
DC bits[6:0] for OUTB8
DC bits[6:0] for OUTR9
DC bits[6:0] for OUTG9
DC bits[6:0] for OUTB9
DC bits[6:0] for OUTR10
DC bits[6:0] for OUTG10
DC bits[6:0] for OUTB10
DC bits[6:0] for OUTR11
DC bits[6:0] for OUTG11
DC bits[6:0] for OUTB11
DC bits[6:0] for OUTR12
DC bits[6:0] for OUTG12
DC bits[6:0] for OUTB12
DC bits[6:0] for OUTR13
DC bits[6:0] for OUTG13
DC bits[6:0] for OUTB13
DC bits[6:0] for OUTR14
DC bits[6:0] for OUTG14
DC bits[6:0] for OUTB14
DC bits[6:0] for OUTR15
DC bits[6:0] for OUTG15
DC bits[6:0] for OUTB15
8.3.2.5 Maximum Current (MC) Data Latch
The maximum output current per channel, I_OLCMax, is programmed by MC data and can be set with the serial
interface. I_OLCMax is the largest current for each output. Each output sinks the I_OLCMax current when they turn on
with DC and BC data set to the maximum value of 7Fh (127d). MC data must have the same data continuously
written twice in order to change the data. When the device is powered on, the MC data are set to 0.
The MC data bit assignment is shown in Table 3. See Table 8 for a summary of the MC data value for each color
group versus the set current value.
Table 3. Maximum Current Data Bit Assignment in the Control Data Latch
CONTROL DATA
LATCH BIT
NUMBER
338-336
341-339
344-342
BIT NAME
MCR[2:0]
MCG[2:0]
MCB[2:0]
DEFAULT VALUE
0
0
0
CONTROLLED CHANNEL
MC bits[2:0] for red color group channels (OUTR0 to OUTR15)
MC bits[2:0] for green color group channels (OUTG0 to OUTG15)
MC bits[2:0] for blue color group channels (OUTB0 to OUTB15)
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