REGISTER AND DATA LATCH CONFIGURATION

CommonShiftRegister(25Bits)

LSB

0

1

Common

Data

Bit22

Common

Data

Bit23

22

23

21

20

Common

Data

Bit19

2

3

4

19

MSB

24

Latch

Select

Bit

¼

Common

Data

Bit21

Common

Data

Bit20

Common

Data

Bit3

Common

Data

Bit1

Common

Data

Bit4

Common

Data

Bit2

Common

Data

Bit0

SOUT

SCK

SIN

5

Common

Data

Bit5

Thelatchpulsecomes

fromLATwhenthe

MSBofthecommon

shiftregisteris ‘0’.

24

ToOutputOn/OffControlCircuit

24

24

OutputOn/OffDataLatch(24Bits)

LSB

0

1

OUTR7

On

OUTG7

On

21

22

20

19

2

3

4

MSB

23

OUTB7

On

¼

OUTB6

On

OUTG6

On

OUTR1

On

OUTG0

On

OUTG1

On

OUTB0

On

OUTR0

On

5

OUTB1

On

24

ControlDataLatch(24Bits)

7

ToGlobalBrightness

ControlCircuit

forOUTB0-OUTB7

7

ToGlobalBrightness

ControlCircuit

forOUTR0-OUTR7

3

ToLSD/LOD

Circuit

ToGlobalBrightness

ControlCircuit

forOUTG0-OUTG7

7

Thelatchpulsecomes

fromLATwhenthe

MSBofthecommon

shiftregisteris ‘1’.

Detection

Voltage

Select0

Detection

Voltage

Select1

Detection

Voltage

Select2

OUTB0-7

Bright

Bit6

OUTG0-7

Bright

Bit6

OUTB0-7

Bright

Bit0

OUTR0-7

Bright

Bit6

OUTG0-7

Bright

Bit0

OUTR0-7

Bright

Bit0

LSB

0

21

22

20

6

7

MSB

23

¼

13

¼

¼

14

TLC5952

The TLC5952 has two writable data latches: the output on/off data latch and the control data latch. Both data

latches are 24 bits in length. If the common shift register MSB is '0', the least significant 24 bits of data from the

25-bit common shift register are latched into the output on/off data latch. If the MSB is '1', the data are latched

into the control data latch. Figure 33 shows the common shift register and the control data latch configuration.

Figure 33. Grayscale Shift Register and Data Latch Configuration

Output On/Off Data Latch

The output on/off data latch is 24 bits long. This latch is used to turn each output current sink (OUTRn/Gn/Bn) on

or off. When the MSB of the common shift register is set to '0', the lower 24 bits are written to the output on/off

data latch on the rising edge of LAT. If the output on/off data latch bit corresponding to an output is '0', the output

is turned off; if the bit is a '1', the output is turned on.

When the IC is powered on, the data in the output on/off data latch are not set to any default value. Therefore,

the on/off control data should be written to the data latch before the constant-current outputs are turned on.

Copyright © 2009, Texas Instruments Incorporated

Submit Documentation Feedback

19

Product Folder Link(s): TLC5952