CTRL

Training

start

command

Training

end

command

Blank

Period

C

CTRL

Training

start

command

Training

end

command

Blank

Period

C

I

CTRL

Blank period

Training start

command

Training

end

command

12

LP5560

SNVS873D – AUGUST 2012 – REVISED JUNE 2016

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Copyright © 2012–2016, Texas Instruments Incorporated

7.3.3.1 Ending the Training Sequence

A training end command can be given at any time of the training sequence except during blank time. Outcome of

the training sequence depends on the place of the training end command. If a training end command is given

after any of the off-time setting (OFF1, OFF2 or OFF3), mode bit is set to 1, and the corresponding number of

pulses are stored into memory. If a training end command is given after any of the other pulse parameters (Rx,

ONx or Fx) that pulse is ignored. For example, if training end command is given after ON2 pulse 2 is ignored and

blinking sequence includes only pulse 1.

7.3.3.2 Reset to Default

If a training end command is given right after a training start command, the LP5560 is reset back to factory

defaults (Figure 13). In this case the mode bit is set to 1 (run mode) with the factory-set default blinking

sequence.

Figure 13. Reset to Default

7.3.3.3 Changing the LED Current

The LP5560 devices allows changing the LED output current without the need to reprogram the previously

programmed blinking sequence. This is done by giving the training end command after current setting

(Figure 14). In this case only the current setting changes. If a blinking sequence was programmed into the

LP5560 device it remains unchanged. If mode bit was 0 (follow mode) before the training sequence it remains 0.

Figure 14. Current Programming Sequence

7.3.3.4 Entering Follow Mode

Mode bit can be set to 0 (follow mode) in two ways. If training end command is given after calibration pulse mode

bit is set to 0 (follow mode) and the previously set LED output current setting remains unchanged (Figure 15).

Figure 15. Entering Follow Mode

If training end command is given after R1, ON1 or F1 mode bit is set to 0 (follow mode) and new current setting

is stored to current register (Figure 16). If a training end command is given after F1 CTRL low time before

training end command needs to be less than minimum training pulse off time (200 µs). Otherwise off time OFF1

is set to minimum value, and pulse 1 is stored into memory.