AN2841 datasheet(8/31 Pages) STMICROELECTRONICS

Part #	AN2841

Description	This application note deals with the general principles of LED dimming

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Manufacturer	STMICROELECTRONICS [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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