LP5562 datasheet(20/52 Pages) TI2

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LP5562

SNVS820B – APRIL 2013 – REVISED DECEMBER 2016

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Table 17. End Command Bits (continued)

NAME

VALUE

DESCRIPTION

reset

Keep the current PWM value.

Set PWM value to 0.

(1)

X means do not care whether 1 or 0.

7.3.3.4.6

Trigger

Wait or send triggers can be used to synchronize operation between different engines. The send-trigger

command takes sixteen 32-kHz clock cycles; the wait-for-trigger command takes at least sixteen 32-kHz clock

cycles. The receiving engine stores sent triggers. Received triggers are cleared by wait for trigger command if

received triggers match to engines defined in the command. Engine waits until all defined triggers have been

received.

Table 18. Trigger Command(1)

wait trigger <2:0>

send trigger <2:0>

ENG3

ENG2

ENG1

ENG3

ENG2

ENG1

Table 19. Trigger Command Bits

NAME

VALUE(d)

DESCRIPTION

wait

trigger<2:0>

0-7

Wait for trigger for the engine(s) defined. Several triggers can be

defined in the same command. Bit 0 is engine 1, bit 1 is engine2, bit

2 is engine 3.

send

trigger<2:0>

0-7

Send trigger for the engine(s) defined. Several triggers can be

defined in the same command. Bit 0 is engine 1, bit 1 is engine2, bit

2 is engine 3.

7.3.3.5 Program Load and Execution Example

•

Start up device and configure device to SRAM write mode

–

Supply 3.6V to VDD

–

Supply 1.8V to EN

–

Wait 1 ms

–

Generate 32 kHz clock to CLK_32K pin

–

Write to address 00h 0100 0000b (enable device)

–

Wait 500 μs (startup delay)

–

Write to address 01h 0001 0000b (configure engine 1 into 'Load program to SRAM' mode)

•

Program load to SRAM

–

Write to address 10h 0000 0011b (1st ramp command 8MSB)

–

Write to address 11h 0111 1111b (1st ramp command 8 LSB)

–

Write to address 12h 0100 1101b (1st wait command 8 MSB)

–

Write to address 13h 0000 0000b (1st wait command 8 LSB)

–

Write to address 14h 0000 0011b (2nd ramp command 8 MSB)

–

Write to address 15h 1111 1111b (2nd ramp command 8 LSB)

–

Write to address 16h 0110 0000b (2nd wait command 8 MSB)

–

Write to address 17h 0000 0000b (2nd wait command 8 LSB)

•

Enable Power Save and use external 32 kHz clock

–

Write to address 08h 0010 0000b (enable powersave, use external clock)

•

Run program

–

Write to address 01h 0010 0000b (Configure LED controller operation mode to "Run program" in engine 1)

–

Write to address 00h 0110 0000b (Configure program execution mode from "Hold" to "Run" in engine 1)

The LP5562 will generate a 1100 ms long LED pattern which will be repeated infinitely. The LED pattern is

illustrated in the figure below.

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