LM3554 datasheet(24/43 Pages) TI1

No de pièce	LM3554

Description	Synchronous Boost Converter with 1.2A Dual High Side LED Drivers and I2C Compatible

PDF	43 Pages

Scroll/Zoom	100%

Fabricant	TI1 [Texas Instruments]

Site Internet	http://www.ti.com

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24 / 43 page

STROBE

Timeout

Duration

I2C Torch

Command

ILED

ITORCH

FLASH

Flash Brightness Register bit 7 (STR) = 1

STROBE goes high and the LEDs turn on into Flash

mode. LEDs will stay on for the timeout duration even

if STROBE goes low before.

STROBE

Timeout

Duration

I2C Torch

Command

Start of

Timeout

Counter

Timeout

Counter

Reset

Default State

STROBE goes high and the LEDs turn on into Flash

mode. LEDs will turn off at the end of timeout

duration or when STROBE goes low. Everytime

STROBE goes high the timeout resets.

I FLASH

ITORCH

ILED

STROBE

TX1/TORCH

Default State

(TX1 event before and after STROBE event)

Timeout

Duration

TORCH

LED

LM3554

SNVS549A – JUNE 2009 – REVISED APRIL 2011

www.ti.com

Figure 8. TX1 Event Before and After Flash Event (Default State, TX1/TORCH is an Active High TX Input)

Figure 9. STROBE Input is Level Sensitive (Default State, STR bit = 0)

Figure 10. STROBE Input is Edge Sensitive (STR bit = 1)

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