LP8556 datasheet(40/67 Pages) TI2

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LP8556

SNVS871M – JULY 2012 – REVISED JUNE 2020

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8.6.2.9 CFG3

Address A3h

CFG3 REGISTER

RESERVED

SLOPE[2:0]

FILTER[1:0]

PWM_INPUT_HYSTERESIS[1:0]

NAME

BIT

ACCESS

DESCRIPTION

RESERVED

R/W

SLOPE

6:4

R/W

Select brightness change transition duration

000 = 0 ms (immediate change)

001 = 1 ms

010 = 2 ms

011 = 50 ms

100 = 100 ms

101 = 200 ms

110 = 300 ms

111 = 500 ms

FILTER

3:2

R/W

Select brightness change transition filtering strength

00 = No filtering

01 = light smoothing

10 = medium smoothing

11 = heavy smoothing

PWM_INPUT_

_HYSTERESIS

1:0

R/W

PWM input hysteresis function.

00 = OFF

01 = 1-bit hysteresis with 13-bit resolution

10 = 1-bit hysteresis with 12-bit resolution

11 = 1-bit hysteresis with 8-bit resolution

8.6.2.10 CFG4

Address A4h

CFG4 REGISTER

PWM_TO_I_THRESHOLD[3:0]

RESERVED

STEADY_

_DITHER

DITHER[1:0]

NAME

BIT

ACCESS

DESCRIPTION

PWM_TO_I_THRESHOLD

7:4

R/W

Select switch point between PWM and pure current dimming

0000 = current dimming across entire range

0001 = switch point at 10% of the maximum LED current.

0010 = switch point at 12.5% of the maximum LED current.

0011 = switch point at 15% of the maximum LED current.

0100 = switch point at 17.5% of the maximum LED current.

0101 = switch point at 20% of the maximum LED current.

0110 = switch point at 22.5% of the maximum LED current.

0111 = switch point at 25% of the maximum LED current. This is a

recommended selection.

1000 = switch point at 33.33% of the maximum LED current.

1001 = switch point at 41.67% of the maximum LED current.

1010 = switch point at 50% of the maximum LED current.

1011 to 1111 = PWM dimming across entire range

RESERVED

R/W

STEADY_DITHER

R/W

Dither function method select:

0 = Dither only on transitions

1 = Dither at all times

DITHER

1:0

R/W

Dither function control

00 = Dithering disabled

01 = 1-bit dithering

10 = 2-bit dithering

11 = 3-bit dithering

LP8556 数据表(PDF) 40 Page - Texas Instruments

LP8556 数据表(HTML) 40 Page - Texas Instruments

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LP8556 数据表(PDF) 40 Page - Texas Instruments

LP8556 数据表(HTML) 40 Page - Texas Instruments

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