RESET

STANDBY

ACTIVE

POR = L

Control command

POR

Control command

ends

POR = H

LP5522

www.ti.com

SNVS488 – JUNE 2007

LP5522 Block Diagram

Modes of Operation

RESET In the reset mode all functions are off and all registers are reset to the default values. Reset is entered

always if internal Power On Reset (POR) is active. Power On Reset will activate during the device startup

STANDBY: After Power On Reset device is in Standby mode. This is the low power consumption mode, when

all circuit functions are disabled.

ACTIVE: Once rising edge of CTRL signal is detected device goes into Active mode. In Active mode four sub

modes are present:

RUN: Run mode is divided into two sub modes depending on whether a blinking sequence is programmed into

memory or not.

Non-programmed mode: No blinking sequence programmed to memory. LED output follows CTRL input

Programmed mode: Blinking sequence programmed to memory. LED output follows the programmed blinking

sequence

RUN ONCE: In Run once mode, programmed blinking sequence is performed once and after that device

returns into Standby mode. Run once mode is available only if a blinking sequence is programmed into

memory.

Copyright © 2007, Texas Instruments Incorporated

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