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AS3820 датащи(PDF) 24 Page - Dialog Semiconductor

номер детали AS3820
подробное описание детали  16-Channel White LED Controller for LCD Backlight
PDF  52 Pages
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производитель  DIALOG [Dialog Semiconductor]
домашняя страница  http://www.dialog-semiconductor.com/
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AS3820 датащи(HTML) 24 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
24 of 52
05-Feb-2019
If UPDATEmode = 0 new data from the serial interface are store immediately after xCS goes high and will take effect
after current PWM cycle is finished. In this mode the values in the PWMxdel registers are ignored. There will be no
Delay on the PWM signals.
Figure 8.8 : UPDATE mode
The PWMxHT-values are double buffered. HighTime values for the next VSYNC can be written even when the current
HighTime is not finished.
Within the first two HSYNC pulses after rising VSYNC no SPI data transfer is allowed.
8.2.5 Direct PWM Mode
The internal signals PWMx can also be direct applied at the VSYNC input if the bit Direct_PWM =1.
In this mode the default driver has the following configuration:
• All current outputs are ON
• All feedback controls are enabled and connected to FB1
• Open LED detection is enabled
• Open LED detection auto turn OFF function is enabled
• Open LED detection retrial function is enabled
• Short LED detection (Short-COMP) is enabled
• Short LED detection auto turn OFF function is enabled
• Undervoltage lockout and overtemperature detection are enabled
In this mode the device starts with default settings and can still be programmed via SPI.
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