AS3820 datasheet(25/52 Pages) DIALOG

Il numero della parte	AS3820

Spiegazioni elettronici	16-Channel White LED Controller for LCD Backlight

PDF	52 Pages

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Produttore elettronici	DIALOG [Dialog Semiconductor]

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25 / 52 page

AS3820

16-Channel White LED Controller for LCD Backlight

Rev. 1.1

Datasheet

www.dialog-semiconductor.com

25 of 52

05-Feb-2019

8.2.6 VSYNC Detect

If the bit ”VSYNCdet” is set (Register “PWM_CTRL”) the VSYNC detector monitors the presence of a VSYNC signal.

If the VSYNC signal is missing for more than 100ms the following changes are done:

● In Register “STATUS” the bit “STAT novsync” is set

● Output xFAULT is acitivated (LOW)

● Current outputs are turned OFF. All register settings remain while the outputs are turned OFF

If the VSYNC signal is applied again the following changes are done:

● In Register “STATUS” the bit “STAT novsync” is reset

● Output xFAULT is deactivated

● Current outputs are turned ON

8.2.7 VSYNC Duration

Since the VSYNC input is connected to an edge detector, there is no restriction on the duration of the VSYNC pulse.

AS3820 Scheda tecnica(PDF) 25 Page - Dialog Semiconductor