LP5523 datasheet(49/61 Pages) TI2

49 / 61 page

LP5523

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SNVS550E – SEPTEMBER 2009 – REVISED JANUARY 2017

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LP5523 enables up to four parallel devices together, which can drive up to 12 RGB LEDs or 36 single LEDs.

Figure 26 shows the connections for two LP5523 devices for six RGB LEDs. Note that D7, D8, and D9 outputs

are used for the red LEDs. The SCL and SDA lines must each have a pullup resistor placed somewhere on the

line (R3 and R4; the pullup resistors are normally located on the bus master.). In typical applications, values of

1.8 kΩ to 4.7 kΩ are used, depending on the bus capacitance, I/O voltage, and the desired communication

speed. INT and TRIG are open-drain pins, which must have pullup resistors. Typical values for R1 and R2 are

from 120 kΩ to 180 kΩ for two devices.

8.2 Typical Applications

8.2.1 Using Two LP5523 Devices in Same Application

The LP5523 enables up to four parallel devices together, which can drive up to 12 RGB LEDs or 36 single LEDs.

This diagram shows the connections for two LP5523 devices for six RGB LEDs. Note that D7, D8 and D9

outputs are used for the red LEDs. The SCL and SDA lines must each have a pullup resistor placed somewhere

on the line (R3 and R4; The pullup resistors are normally located on the bus master.). In typical applications

values of 1.8 kΩ to 4.7 kΩ are used, depending on the bus capacitance, I/O voltage, and the desired

communication speed. INT and TRIG are open-drain pins, so they must have pullup resistors. Typical values for

R1 and R2 are from 120 k to 180 k for two devices.

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