Dot Correction (DC) Function

I

(mA)=I

(mA)

OUTn

OLCMax

´

DCn

63d

(2)

TLC5944

The TLC5944 is able to individually adjust the output current of each channel (OUT0 to OUT15). This function is

called dot correction (DC). The DC function allows users to individually adjust the brightness and color deviations

of LEDs connected to the outputs OUT0 to OUT15. Each respective channel output current can be adjusted in

TLC5944 via the serial interface.

Equation 2 determines the sink current for each output (OUTn):

Where:

• I

• DCn = the programmed dot correction value for OUTn (DCn = 0 to 63d)

When the IC is powered on, the data in the dot correction shift register and data latch are not set to any default

values. Therefore, DC data must be written to the DC latch before turning on the constant current output.

Table 2 summarizes the DC data versus current ratio and set current value.

Table 2. DC Data versus Current Ratio and Set Current Value

SET CURRENT

OUTPUT CURRENT

OUTPUT CURRENT

DC DATA

DC DATA

DC DATA

RATIO TO

(mA, Typical)

(mA, Typical)

(Binary)

(Decimal)

(Hex)

MAX CURRENT (%)

00 0000

0

00

0.0

0.0

0.000

00 0001

1

01

1.6

0.4

0.032

00 0010

2

02

3.2

0.8

0.064

... ...

... ...

... ...

... ...

... ...

... ...

11 1101

61

3D

96.8

58.1

1.937

11 1110

62

3E

98.4

59.0

1.968

11 1111

63

3F

100.0

60.0

2.000

16

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