TLC5949PWPR datasheet(29/51 Pages) TI

29 / 51 page

Lower 137 Bits

Second Control Data Latch (119 Bits)

7 Bits

112 Bits

13-7

20-14

27-21

97-91

104-98

111-105

MSB

118-112

90-84

Bits[6:0]

for OUTn

Global Brightness

Control Circuit

Applied

Bits

LSB

6-0

RSV

Bits

RSV

Bits

RSV

Bits

RSV

Bits

RSV

Bits

RSV

Bits

RSV

Bits

RSV

Bits

BC,

7 Bits

112 Reserved Bits (Write '1' to All Bits)

First Control Data Latch (137 Bits)

18 Bits

MSB

136-119

13-7

20-14

27-21

97-91

104-98

111-105

118-112

FC,

18 Bits

90-84

Bits

17-0

Bits[6:0]

for OUTn

Function

Control Circuit

LSB

6-0

RSV

Bits

(1)

RSV

Bits

RSV

Bits

RSV

Bits

RSV

Bits

RSV

Bits

RSV

Bits

RSV

Bits

BC,

7 Bits

112 Reserved Bits (Write ‘1’ to All Bits)

119 Bits

From Common Shift Register

This latch pulse comes

from the LAT pin when

the MSB of the Common

Shift Register is ‘1’.

The 4096th GSCLK is used

to latch the data when the

Auto Display Repeat is

enabled or when the BLANK bit

is set to ‘1’.

TLC5949

www.ti.com

SBVS219A – DECEMBER 2012 – REVISED DECEMBER 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

global brightness control (BC) data and function control (FC) data; the second latch contains 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

control data latch are copied to the second latch when the 4096th 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, 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 29.

(1) RSV = reserved.

Figure 29. First and Second Control Data (BC and FC) Latch Configuration

Global Brightness Control (BC) Data

Global BC data are seven bits long. The global brightness for all outputs is controlled by the second control data

latch. The data are used to adjust the constant-current values for the 16 constant-current outputs. As explained

in the Global Brightness Control (BC) Function section, the BC values are used to adjust the output current from

25% to 100% of the maximum value. The global BC data bit assignment in the first and second latches is shown

in Table 6. Table 2 summarizes the BC data value versus set current value.

Table 6. Global Brightness Control Data Bit Assignment in the Control Data Latch

BIT NUMBER

BIT NAME

CONTROLLED CHANNEL

118-112

BC[6:0] bits for all channels (OUT0-OUT15)

Submit Documentation Feedback

Product Folder Links: TLC5949

TLC5949PWPR Datasheet(PDF) 29 Page - Texas Instruments

TLC5949PWPR Datasheet(HTML) 29 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Datasheet Download

Link URL