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AN2841 Arkusz danych(PDF) 10 Page - STMicroelectronics

Numer części AN2841
Szczegółowy opis  This application note deals with the general principles of LED dimming
PDF  31 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2841 Arkusz danych(HTML) 10 Page - STMicroelectronics

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Dimming application using an STM32 microcontroller
AN2841
10/31
The LED brightness value is defined by the user in the
LEDmap array. The LEDmap is an
array of 8-bit numbers (when using an 8-bit dimming resolution). Each value is dedicated
to one single LED (Figure 7).
The dimming algorithm converts the
LEDmap array into a serial stream. The serial stream
in combination with the LE signal generates requested PWM outputs on the LED drivers
as shown in Figure 8.
Figure 7.
Computation of
LEDdriverDATAbuffer variable
AM00346
depth = 0
DATAchar = 0
DATAchar++
Detail in Figure 8:
LEDmap
LEDdriverDATAbuffer
depth++
LED
Driver
SPI
0 .. 255 for 8-bit PWM resolution
0 .. LEDcount / 8
–
–
+
+
DATAchar>3
depth>255
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