LP5521 datasheet(14/48 Pages) TI1

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96 112 128 144 160 176 192 208 224 240

100

LOG_EN = 1

LOG_EN = 0

CONTROL (DEC)

LP5521

SNVS441H – JANUARY 2007 – REVISED MAY 2016

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PWM frequency is either 256 Hz or 558 Hz, frequency is set with PWM_HF bit in register 08H. When PWM_HF

is 0, the frequency is 256 Hz, and when bit is 1, the PWM frequency is 558 Hz. Brightness adjustment is either

linear or logarithmic. This can be set with register 00H LOG_EN bit. When LOG_EN = 0 linear adjustment scale

is used, and when LOG_EN = 1 logarithmic scale is used. By using logarithmic scale the visual effect seems

linear to the eye. Register control bits are presented in Table 3, Table 4, and Table 5:

Table 3. R_CURRENT Register (05H), G_CURRENT register (06H), B_CURRENT register (07H):

NAME

BIT

DESCRIPTION

CURRENT

7:0

Current setting

bin

hex

dec

0000 0000

0000 0001

0000 0010

0000 0011

0000 0100

0000 0101

0000 0110

...

1010 1111

...

1111 1011

1111 1100

1111 1101

1111 1110

1111 1111

...

175

...

251

252

253

254

255

0.0

0.1

0.2

0.3

0.4

0.5

0.6

...

17.5 (def)

...

25.1

25.2

25.3

25.4

25.5

Table 4. ENABLE Register (00H):

NAME

BIT

DESCRIPTION

LOG_EN

Logarithmic PWM adjustment enable bit

0 = Linear adjustment

1 = Logarithmic adjustment

Table 5. CONFIG Register (08H):

NAME

BIT

DESCRIPTION

PWM_HF

PWM clock frequency

0 = 256 Hz, frequency defined by the 32-kHz clock (internal or external)

1 = 558 Hz, frequency defined by internal oscillator

Figure 16. Logarithmic and Linear PWM Adjustment Curves

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