LM3532 datasheet(13/52 Pages) TI2

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Code x DPWM

255

FULLSCALE

LED

0.1

100

BRIGHTNESS CODE (D)

16 32

64 80 96 112 128 144 160 176 192 208 224 240 256

Code

6.4

LED

LED _ FULLSCALE

PWM

0.85

LM3532

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SNVS653E – JULY 2011 – REVISED AUGUST 2015

Device Functional Modes (continued)

7.4.4 LED Current Mapping Modes

All LED current brightness codes are 8 bits (256 different levels), where each bit represents a percentage of the

programmed full-scale current setting for that particular Control Bank. The percentage of the full-scale current is

different depending on which mapping mode is selected. The mapping mode can be either exponential or linear.

Mapping mode is selected via bit [1] of the Control A, B, or C Brightness Configuration Registers.

7.4.5 Exponential Current Mapping Mode

In exponential mapping mode, the backlight code to LED current approximates the following equation:

where

•

Code is the 8-bit code in the programmed brightness register

•

DPWM is the duty cycle of the PWM input that is assigned to the particular control bank

(1)

Figure 12 shows the typical response of percentage of full-scale current setting vs 8-bit brightness code.

Figure 12. Exponential Mapping Response

7.4.6 Linear Current Mapping

In linear mapping mode the backlight code to LED current approximates Equation 2:

where

•

Code is the 8-bit code in the programmed brightness register

•

DPWM is the duty cycle of the PWM input that is assigned to the particular control bank.

(2)

For the linear mapped mode (Figure 13) shows the typical response of percentage of full-scale current setting vs

8-bit brightness code.

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