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AS3820 датащи(PDF) 36 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) 36 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
36 of 52
05-Feb-2019
R1
VOUT =
(1+_______)xV
SENSE + R1 x “idac_fbx_counter” x 1μA
R2
Example: VoutMIN = 60V, VoutMAX = 80V, VSENSE = 1.25V
(VoutMAX – VoutMIN)
(80V – 60V)
R1 = _________________ = ____________ = 78kW
255μA
255μA
R1
78kW
R2 = _______________ = _______________ = 1.66kW
VoutMIN
60V
(__________1) (_______1)
VSENSE
1.25V
8.7 GPIO
The two pins DCDCEN and Mode3D can be used to change the configuration of a DC-DC controller. These pins can
also be used as general purpose input/output pins which can be configured as high impedance input, Push-Pull output
or Open drain output. Also the output pin xFAULT can be configured.
Figure 8.16 : GPIO
8.8 SPI Interface
For the data transfer a serial peripheral interface (SPI) is used. The SPI is configured to work only as SPI slave. If
more than one driver is connected to a SPI master, they can be connected in a “Daisy Chain”-structure or a parallel
structure.
8.8.1 SPI Daisy Chain Structure
All SPI slaves share the same clock (SCLK) and chip select (xCS) signal. In that configuration all devices can
be treated as one big shift register. The devices are automatically enumerated as described in the next section.



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