MP3313 Rev.1.0

www.MonolithicPower.com

20

8/2/2017

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Table 7: Brightness Control Register

Addr: 0x11

Bit

Bit Name

Access

Default

Description

7

MAPMD

r/w

0

LED current mapping mode bit.

0: linear mapping

1: exponential mapping

6:4

BRTMD2:0

r/w

011

Brightness mode control bits.

000: brightness register only

001: PWM duty only

010: brightness register multiplies PWM duty before ramp

011: ramp before brightness register multiplies PWM duty

100: LED current multiplies PWM duty

3

SLPEN

r/w

0

LED current slope enable bit.

0: LED current slope disabled

1: LED current slope enabled

2:0

TSLP2:0

r/w

000

LED current slope time for each step.

000: 0.125ms/step

001: 0.25ms/step

010: 0.5ms/step

011: 1ms/step

100: 2ms/step

101: 4ms/step

110: 8ms/step

111: 16ms/step

Table 8: PWM Control Register

Addr: 0x12

Bit

Bit Name

Access

Default

Description

7:6

PWMSR

r/w

01

PWM sample frequency set bits.

00: 800kHz

01: 4MHz

1x: 24MHz

5

PWM_P

r/w

1

PWM input polarity set bit.

0: active low

1: active high

4:2

HYS2:0

r/w

100

PWM hysteresis set bits.

000: no hysteresis

001: 1 clock

010: 2 clock

011: 3 clock

100: 4 clock

101: 5 clock

110: 6 clock

111: reserved

1:0

FILTER1:0

r/w

11

PWM input filter bits.

00: no filter

01: 80ns

10: 160ns

11: 240ns