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AN2841 Arkusz danych(PDF) 8 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) 8 Page - STMicroelectronics

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Description of LED dimming
AN2841
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The outcome of Equation 1 is valid only for the best-case scenario when the data are sent
to the LED driver without any delay between blocks of data. This example, of course, is not
a real one. The values for a real application can only get close to the value determined
above.
2.3
Specific dimming application using an STP24DP05
Figure 4 illustrates a simple dimming application using an STP24DP05 24-bit constant
current LED sink driver with output error detection.
Figure 4.
Simplified setup of an application using an STP24DP05
Driving
system
STP24DP05
R1...8 G1...8 B1...8
SPI
More drivers in cascade…
RGB LED configuration
LED block
3.3 V
Temperature
sensor
SPI
OE-R/G/B
STP24DP05
LE
5 V
AM00344



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