AN3981 datasheet(9/54 Pages) STMICROELECTRONICS

9 / 54 page

AN3981

8-bit LED array drivers

Doc ID 022217 Rev 1

9/54

8-bit LED array drivers

2.1

Main features

The 8-bit LED array driver family is composed of two products: the STP08CP05 and

STP08DP05.

●

Eight constant current output channels

●

Adjustable output current from 5 to 100 mA through an external resistor

●

Short and open output error detection (only for the STP08DP05)

●

20 V current generators rated voltage

●

Supply voltage from 3.3 V to 5.5 V.

Figure 6.

Typical application circuit for STP08xP05 devices

2.2

Applications

This family is suitable for several applications in different market segments, such as gaming

machines, white goods, LED signage, and automotive LED lighting.

2.3

Block diagram

Figure 7 represents the block diagram valid for the 8-bit LED array driver family.

The 8-bit shift register contains the digital data loaded through the SDI pin. The “Latch and

Enable” block contains the digital word loaded from the 8-bit shift register once the LE pulse

has been detected.

The “Analog stage” represents the circuitry to drive each current generator consistently with

the digital word contained in the “Latch and Enable” block, setting the correct current in

accordance with the resistor connected to the REXT pin. This block is enabled by the

pin.

AN3981 Datasheet(PDF) 9 Page - STMicroelectronics