Command entering

period

Blank period

Programmed sequence

CTRL

LED

To Standby

Command entering period

Blank period

Command execution

starts

CTRL

LED

Command entering period

Blank period

Command execution

starts

CTRL

LED

LP5522

SNVS488 – JUNE 2007

www.ti.com

If CTRL signal is low after command entering period, command execution starts when CTRL is pulled high. This

does not apply to Run command. With Run command CTRL must be high. Note that no rising edges are allowed

during blank period.

LED Controller Commands and Operation

There are four commands available for LP5522.

Command

Number of rising edges during command entering period

Run

One rising edge

Training start

Two rising edges

Training end

Three rising edges

Run once

Four rising edges

RUN COMMAND

One rising edge of CTRL signal within command entering period is interpreted as Run command. In programmed

mode blinking sequence is started right after Blank period and it is repeated as long as CTRL signal is kept high.

When CTRL signal is set low device goes into Standby mode.

In non-programmed mode LED is on as long as CTRL is kept high. When CTRL signal is set low device goes

into Standby mode.

8

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