LP5813 datasheet(24/60 Pages) TI

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9.3.5.2 Sloper

Sloper is the basic element to achieve autonomous fade-in and fade-out animations. It can achieve 256 steps

fade-in or fade-out effects from 'PWM_Start' to 'PWM_End' within a target time period T as Figure 9-17. The 8-bit

PWM steps, which is configurable in animation pattern PWM setting registers, help to achieve extremely smooth

effects. Exponential dimming curve can also be supported in the sloper.

PWM_Start

PWM_End

Figure 9-17. Sloper curve demonstration

The programable time T is selectable from 0 to around 8 s with 16 levels shown in Table 9-4.

Table 9-4. Programable time options

Time (Typ.)

0 s

0.1 s

0.2 s 0.35 s 0.55 s 0.8 s

1 s

1.5 s

2 s

2.5 s

3 s

4 s

5 s

6 s

7 s

8 s

9.3.5.3 Animation Engine Unit (AEU)

The AEU is the most important unit to achieve autonomous animation effects. One AEU is formed by 4 slopers.

There are 5 PWM values and 4 time values can be configured in the AEU. Each PWMx (x = 1, 2,…, 5) can be

arbitrarily programmed from 0 to 255, The Tx ( x = 1, 2, 3, 4) is selectable from 0 to 8 s with 16 levels referring to

Table 9-4. If two adjacent PWM values are equal, the brightness keeps unchange within the time setting. When

a Tx is set to 0, this sloper is skipped. To avoid flicker happens due to PWM value suddenly changes, the begin

and end PWM of this sloper need to be the same.

Typical breathing effect example is illustrated as Figure 9-18.

PWM1

PWM2

PWM3

PWM4

PWM5

Figure 9-18. Animation engine unit - Example 1

Advanced breathing effect example is shown in Figure 9-19. 2 different fading speeds are set in the PWM rising

and falling phases, to achieve a complex animation.

PWM1

PWM2

PWM3

PWM4

PWM5

Figure 9-19. Animation engine unit - Example 2

9.3.5.4 Animation Pause Unit (APU)

The APU is defined as the pausing time at the beginning and the end of the animation pattern. The APU

contains 1 time value which is selectable from 0 to 8 s with 16 levels referring to Table 9-4. If the value is set as

0, the APU is skipped. The brightness of APU1 uses the PWM1 value of the AEU following the APU1, while the

brightness of APU2 uses the PWM5 value of the AEU in front of APU2. One animation pattern example is shown

LP5813

SNVSC74 – SEPTEMBER 2023

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