LP5562 datasheet(21/52 Pages) TI1

21 / 52 page

LED PWM mapped

to Engine1

PWM value

127

255

Time (ms)

100

200

400

300

500

600

700

800

900 1000 1100

1200

Engine1 program:

ramp up to PWM value 128 in 200 ms

wait 200 ms

ramp down to PWM value 0 in 200 ms

wait 500 ms

1300 1400

1500 1600 1700

Engine1 program as binary code:

0000001101111111

0100110100000000

0000001111111111

0110000000000000

SVA-30197408

LP5562

www.ti.com

SNVS820A – APRIL 2013 – REVISED SEPTEMBER 2015

Figure 17. LED Lighting Pattern and Code for Program Load and Execution Example

7.3.4 Power-Save Mode

Automatic power save mode is enabled when the PS_EN bit in register address 08h is 1. Almost all analog

blocks are powered down in power save, if an external clock is used. However, if an internal clock has been

selected, only the LED drivers are disabled during power save since the digital part of the LED controller need to

remain active. During program execution the LP5562 can enter power-save mode if there is no PWM activity in

engine controlled outputs. To prevent short power-save sequences during program execution, the LP5562 has a

command look-ahead filter. In each instruction cycle every engine commands are analyzed, and if there is

sufficient time left with no PWM activity, the device will enter power save. In power save program execution

continues uninterruptedly. When a command that requires PWM activity is executed, fast internal startup

sequence will be started automatically. The following tables describe commands and conditions that can activate

power save. All engines need to meet power-save conditions in order to enable power save.

Table 20. Engine Operation Mode and Power Save

ENGINE OPERATION

POWER SAVE CONDITION

MODE

00b

Disabled mode enables power save

01b

Load program to SRAM mode prevents power save.

Run program mode enables power save if there is no PWM activity and

10b

command look-ahead filter condition is met.

11b

Direct control mode enables power save if there is no PWM activity.

Table 21. Engine Commands and Power Save

COMMAND

POWER SAVE CONDITION

No PWM activity and current command wait time longer than 50 ms. If

Wait

prescale = 1 then wait time needs to be longer than 80 ms.

Ramp command PWM value reaches minimum 0 and current command

Ramp

execution time left more than 50 ms. If prescale = 1 then time left needs to be

more than 80 ms.

Trigger

No PWM activity during wait for trigger command execution.

End

No PWM activity or Reset bit = 1.

Enables power save if PWM set to 0 and next command generates at least 50

Set PWM

ms wait.

Other commands

No effect to power save.

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