TLC5948A Datasheet, PDF (29/50 Pages) Texas Instruments – 16-Channel, 16-Bit, ES-PWM, Full Self-Diagnosis LED Driver

TLC5948A
www.ti.com
SBVS192 – MARCH 2012
First and Second Control Data Latch
The first and second control data latches are 137 bits and 119 bits long, respectively. The first latch contains dot
correction (DC) data, global brightness control (BC) data, and function control (FC) data; the second latch
contains DC data and global BC data. The DC for each constant-current output and the BC for all constant-
current outputs are controlled by the second control data latch. The control data in the first latch are set by the
least significant 137 bits from the common shift register at the LAT rising edge when the common shift register
MSB is '1'. The 119 bits of DC and BC data from the first control data latch are copied to the second latch when
the 65,536th GSCLK occurs or when the BLANK bit in the first control data latch is set to '1'.
When the device is powered up, the data in the first latch (except the BLANK and PSMODE bits of the FC bits)
and second latch are random. Therefore, DC, BC, and FC data must be written to the first and second control
data latches before turning on the constant-current outputs. The default value of the BLANK bit is '1'. The first
and second control data latch configurations are shown in Figure 32.
From Common Shift Register
First Control Data Latch (137 Bits)
Lower 137 Bits
MSB
136-119 118-112 111-105 104-98
FC
Bits
17-0
BC
Bits[6:0]
for OUTn
DC
Bits[6:0]
OUT15
DC
Bits[6:0]
OUT14
FC,
BC,
18 Bits 7 Bits
97-91
DC
Bits[6:0]
OUT13
90-84
DC
Bits[6:0]
OUT12
27-21
DC
Bits[6:0]
OUT3
DC, 112 Bits
20-14
DC
Bits[6:0]
OUT2
13-7
DC
Bits[6:0]
OUT1
LSB
6-0
DC
Bits[6:0]
OUT0
This latch pulse comes
from the LAT pin when
the MSB of the Common
Shift Register is ‘0’.
Second Control Data Latch (119 Bits)
119 Bits
18 Bits
MSB
118-112 111-105 104-98 97-91 90-84
LSB
27-21 20-14 13-7
6-0
BC
DC
Bits[6:0] Bits[6:0]
for OUTn OUT15
DC
Bits[6:0]
OUT14
DC
Bits[6:0]
OUT13
DC
Bits[6:0]
OUT12
DC
Bits[6:0]
OUT3
DC
Bits[6:0]
OUT2
DC
Bits[6:0]
OUT1
DC
Bits[6:0]
OUT0
BC,
7 Bits
DC, 112 Bits
7 Bits
112 Bits
The 65,536th GSCLK is used
to latch the data when the
Auto Display Repeat is
enabled or when the BLANK bit
is set to ‘1’.
To
To
Function Global Brightness
Control Circuit Control Circuit
To
Dot Correction
Circuit
Figure 32. First and Second Control Data (DC, BC, and FC) Latch Configuration
Copyright © 2012, Texas Instruments Incorporated
Product Folder Link(s): TLC5948A
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