Command entering

period

Blank period

CTRL

LED

To Standby

Programmed sequence

Command entering

period

Blank period

CTRL

LED

To Standby

Programmed sequence

Command entering

period

Blank period

CTRL

LED

To Standby

LP5522

www.ti.com

SNVS488 – JUNE 2007

RUN ONCE COMMAND

Programmed blinking sequence is performed once after Run Once command. Four rising edges of CTRL signal

within command entering period is interpreted as Run Once command. If CTRL is kept high after command

entering period the programmed blinking sequence starts right after the blank period has elapsed. CTRL signal

must stay high as long as programmed blinking sequence is executed. If CTRL is set low during execution of

blinking sequence, device goes to standby and execution of blinking sequence is stopped.

If CTRL signal is low after command entering period, Run Once command is executed once the CTRL is set

high.

TRAINING START COMMAND

Blinking sequence is programmed into memory in training mode. Blinking sequence is stored into volatile

and Training End commands without any valid LED ON/OFF times.

LP5522 enters to Training mode after Training Start command. Two rising edges within command entering

period is interpreted as the Training Start command. The first LED ON time capturing is started once the rising

edge of CTRL signal is detected after the blank period. LED output follows CTRL signal during the programming.

The first LED ON time is recorded once CTRL signal is set low. Same time the first LED OFF time capturing is

started. Programmed blinking sequence can have one to three LED ON/OFF times. In order to be programmed

correctly, at least one valid LED ON and LED OFF time must be recorded.

Copyright © 2007, Texas Instruments Incorporated

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