AN3981 datasheet(25/54 Pages) STMICROELECTRONICS

25 / 54 page

AN3981

STP24DP05

Doc ID 022217 Rev 1

25/54

STP24DP05

4.1

Main features

The STP24DP05 LED array driver is characterized by the following features:

●

Three groups of eight constant current output channels

●

Adjustable output current from 5 mA to 80 mA through an external resistor for each

group

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Error detection

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Gradual delay

●

20 V current generators rated voltage

●

Supply voltage from 3 V to 5.5 V.

Figure 27.

Typical application circuit for the STP24DP05

4.2

Applications

The STP24DP05 is tailored mainly to RGB solutions, like full color high resolution LED

displays, colored traffic signs, etc.

4.3

Block diagram

Figure 28 shows the simplified internal block diagram of the STP24DP05.

The 24 outputs are organized into three groups of eight outputs each. Assuming an RGB

solution, each group is supposed to be dedicated respectively to red, green and blue LEDs.

The current of each group can be adjusted through the resistor connected to the relative

REXT pin (REXTR for red, REXTG for green, REXTB for blue).

Data are loaded through the SDI pin into the “8x3-bit Shift Register”. Data are latched into

the “8x3 Data Latch” block after the LE pulse.

AN3981 Datasheet(PDF) 25 Page - STMicroelectronics