TLC5952 Datasheet, PDF (21/33 Pages) Texas Instruments – 24-Channel, Constant-Current LED Driver with Global Brightness Control and LED Open-Short Detection

TLC5952
www.ti.com........................................................................................................................................................................................................ SBVS129 – MAY 2009
Figure 34 shows the operation to write data into the common shift register and control data latch.
Output On/Off Data Write
SIN
0A
On
Low
B7B
On
G7B R7B
On On
B6B
On
G6B
On
R6B
On
B0B
On
G0B
On
R0B
On
Control Data Write
High
23
Cont
22
Cont
21
Cont
2
Cont
1
Cont
0
Cont
SCLK
LAT
BLANK
1
2
3
4
5
6
23 24 25
1
2
3
23 24 25
The data in the common shift register are copied
to the on/off data latch at the rising edge of LAT.
The data in the common shift register are copied
to the control data latch at the rising edge of LAT.
Common Shift Register
LOD
Bit 0 (Internal)
R0A
Common Shift Register
LOD
Bit 1 (Internal)
G0A
Low
B7B
On
G7B
On
R7B
On
B6B
On
G6B
On
Low
B7B
On
G7B
On
R7B
On
B6B
On
B0B G0B R0B
On
On
On
R1B B0B
On On
G0B
On
LOD
R0B
High
23
Cont
22
Cont
LOD
G0B
LOD
R0B
High
23
Cont
2
1
0
Cont Cont Cont
3
2
1
Cont Cont Cont
Common Shift Register
LOD
Bit 23 (Internal)
B7A
On/Off Data Latch
(Internal)
Control Data Latch
(Internal)
LOD LOD LOD LOD LOD LOD
G7A R7A B6A G6A R6A B5A
SOUT
(Common Shift Register Bit 24)
TEF
LOD LOD LOD LOD LOD LOD
A
B7A G7A R7A B6A G6A R6A
The LOD/LSD result of each LED comes from SOUT.
OUTR0
OUTG0
OFF
ON
(V_OUTRn/Gn/BnH)
(V_OUTRn/Gn/BnL)
OFF
ON
OUTB0
OFF
ON
OUTR1
OFF
ON
LOD
R0A
Low
B7B
On
Previous Data
LOD
B7B
LOD LOD LOD
G7B R7B B6B
Current Data
LOD LOD 23
G0B R0B Cont
Previous Data
Current Data
LOD
G0A
LOD
R0A
Low
TEF
LOD LOD LOD
B
B7B G7B R7B
LOD
G0B
LOD
R0B
High
SID data are copied to the 25-bit
common shift register at the
rising edge of LAT.
RED outputs are turned off by the output on/off data.
Output current
is changed
by BC data.
OUTR7
OUTG7
OUTB7
OFF
ON
OFF
ON
OFF
ON
Figure 34. Data Write Operation
Copyright © 2009, Texas Instruments Incorporated
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