LP5813 datasheet(23/60 Pages) TI

23 / 60 page

The LP5813 allow users to configure the dimming scale as exponential curve or linear curve, through the

‘exp_en’ bits in Dev_Config_5 and Dev_Config_6 registers. A human-eye-friendly visual performance can be

achieved by using the internal exponential scale. The linear scale has great linearity between PWM duty cycle

and PWM setting value, which provides flexible approach for external controlled gamma correction algorithm.

The 8-bit linear and exponential curves are shown as Figure 9-15.

100 %

80 %

60 %

40 %

20 %

0 %

128 160 192 224 255

PWM value (8-bits)

Linear

Scale

Exponenti

al Scale

Figure 9-15. Linear and Exponential PWM Dimming Curves

9.3.5 Autonomous Animation Engine Control

The LP5813 supports both manual mode and autonomous mode to control the DC and PWM of each LED.

In manual mode, the LEDs are directly controlled by the related configuration registers and reflect the value

immediately. In autonomous mode, the autonomous animation engine is applied for each LED, which can

realize vivid lighting effects without external processor control. The animation engine pattern is composed by 3

animation engine units (AEU) and 2 animation pause units (APU) for complex and flexible control. One AEU is

formed by 4 slopers, which is used for fading effect.

After setting up all animation engine pattern configurations, sending start_cmd to the device can let the

animation running autonomously, to free external controller real-time loading. The PWM value and unit status of

each LED can be read from PWM_value registers and pattern_status registers. To make sure the precision of

reading results, sending pause_cmd to pause the animation firstly is recommended.

9.3.5.1 Animation Engine Pattern

Each LED of the LP5813 has own animation engine, to achieve premium visual lighting effects. One whole

animation engine pattern is defined as Figure 9-16. 3 animation engine units (AEU) and 2 animation pause units

(APU) compose the animation engine pattern. AEU2 and AEU3 can be skipped by setting the playback times to

0. The LED current of each LEDs in the autonomous mode is set through the Autonomous_DC registers.

APU1

AEU1

AEU2

AEU3

APU2

Animation Engine Pattern

Animation engine pattern playback times - PT

PT1

PT2

PT3

Figure 9-16. Animation engine pattern

The whole animation pattern includes two APUs and three AEUs with several playback times:

• APUx (x = 1, 2): Animation pause unit, each unit includes one timing value T.

• AEUx (x = 1, 2, 3): Animation engine unit, including 5 PWM values PWM1 to PWM5 and 4 time values T1 to

T4.

• PT: Playback times of AEU1+AEU2+AEU3, which has 2-bit value to set 0/1/2/Infinite times.

• PTx: Playback times of AEUx (x=1/2/3), which has 2-bit value to set 0/1/2/Infinite times.

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LP5813

SNVSC74 – SEPTEMBER 2023

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