TLC5949PWPR datasheet(19/51 Pages) TI

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TLC5949

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SBVS219A – DECEMBER 2012 – REVISED DECEMBER 2012

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

Table 2. BC Data versus Constant-Current Ratio and Set Current Value

BC DATA

RATIO OF OUTPUT

IOUT (mA)

BINARY

DECIMAL

HEX

CURRENT TO IOLCMax(%)

(IOLCMax= 45 mA, typ)

(IOLCMax= 2 mA, typ)

000 0000

00h

25.0

11.25

0.50

000 0001

01h

25.6

11.52

0.51

000 0010

02h

26.2

11.78

0.52

—

111 1101

125

7Dh

98.8

44.47

1.98

111 1110

126

7Eh

99.4

44.73

1.99

111 1111

127

7Fh

100.0

45.00

2.00

GRAYSCALE (GS) FUNCTION (PWM CONTROL)

The TLC5949 can adjust the brightness of each output channel using a pulse width modulation (PWM) control

scheme. The architecture of 12 bits per channel results in 4096 brightness steps, from 0% up to 100%

brightness.

The PWM operation for OUTn is controlled by a 12-bit grayscale (GS) counter. The GS counter increments on

each GS reference clock (GSCLK) rising edge. The GS counter resets to 000h when the BLANK bit in the first

control data latch is set to '1'; the counter value is held at 000h while the BLANK bit is '1', even if the GS clock

input is toggled high and low.

The TLC5949 has two types of PWM control: conventional PWM control and enhanced spectrum (ES) PWM

control. The conventional PWM control can be selected when the ESPWM bit in the first control data latch is '0'.

The ES PWM control is selected when the ESPWM bit is '1'.

The on-time (tOUT_ON) of each output (OUTn) can be calculated by Equation 3.

tOUT_ON = tGSCLK × GSn

(3)

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