TLC5954 Datasheet, PDF(23/45 Page) Texas Instruments – TLC5954 48-Channel, Constant-Current LED Driver with Global Brightness Control, LED Open-Short Detection, and Power-Save Mode

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TLC5954 Datasheet, PDF (23/45 Pages) Texas Instruments – TLC5954 48-Channel, Constant-Current LED Driver with Global Brightness Control, LED Open-Short Detection, and Power-Save Mode

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TLC5954

SBVS241 â APRIL 2014

8.4 Device Functional Modes

8.4.1 Maximum Constant Sink Current

The maximum output current of each channel (IOLCMax) is programmed by maximum current (MC) data and can

be set by the serial interface.

IOLCMax is the highest current for each output. Each OUTXn sinks IOLCMax current when they turn on with the

global brightness control (BC) data set to the maximum value of 7Fh (127d). MC data are updated when the

same data are written to the MC bits twice. When the device is powered on, the MC data latch is set to 0.

Table 2 shows the characteristics of the constant-current sink versus the MC control data.

Table 2. Maximum Constant-Current Output versus MC

Data

MC DATA

BINARY DECIMAL

000 (default)

001

010

011

100

101

110

111

0 (default)

HEX

0 (default)

IOLCMax (mA)

OUTRn,

OUTGn

OUTBn

2.9

2.0

4.4

3.1

5.8

4.1

8.7

6.1

11.6

8.1

17.4

12.2

23.2

16.3

34.9

24.4

8.4.2 Global Brightness Control (BC) Function: Sink Current Control

The device is capable of simultaneously adjusting the output current of each color group (OUTR0 to OUTR15,

OUTG0 to OUTG15, and OUTB0 to OUTB15). This function is called global brightness control (BC). The BC

function allows the global BC data of LEDs connected to the three color groups to be adjusted. All OUTXn can

be adjusted in 128 steps from 6% to 100% of the maximum output current, IOLCMax. The BC data are transmitted

to the device by the serial interface. When BC data change, the output current also changes immediately.

Table 3 shows the BC data versus the constant-current ratio against IOLCMax.

BINARY

MSB LSB

000 0000

000 0001

000 0010

â¦

111 1101

111 1110

111 1111

Table 3. BC Data versus Current Ratio and Set Current Value

BC DATA

DECIMAL

â¦

125

126

127

HEX

â¦

OUTPUT

CURRENT

RATIO TO

IOLCMax

(%, typ)

6.0

6.7

7.5

â¦

98.5

99.3

100.0

OUTPUT CURRENT (mA, typ)

OUTRn, OUTGn

OUTBn

MC = 7h

(IOLCMax = 34.9

mA)

MC = 0h

(IOLCMax = 2.9

mA)

MC = 7h

(IOLCMax = 24.4

mA)

MC = 0h

(IOLCMax = 2.0

mA)

2.09

0.17

1.47

0.12

2.35

0.20

1.65

0.14

2.61

0.22

1.83

0.15

â¦

34.4

2.86

24.1

1.96

34.7

2.88

24.3

1.98

34.9

2.90

24.4

2.00

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