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AS3820 bảng dữ liệu(PDF) 25 Page - Dialog Semiconductor

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Giải thích chi tiết về linh kiện  16-Channel White LED Controller for LCD Backlight
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AS3820 bảng dữ liệu(HTML) 25 Page - Dialog Semiconductor

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AS3820
16-Channel White LED Controller for LCD Backlight
Rev. 1.1
Datasheet
© 2019 Dialog Semiconductor
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.



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