LP8556 datasheet(45/63 Pages) TI1

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LP8556

www.ti.com

SNVS871I – JULY 2012 – REVISED MARCH 2016

Product Folder Links: LP8556

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9 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.

9.1 Application Information

9.1.1 Using LP8556 With I2C Host

9.1.1.1 Setting Boost Switching and PWM Dimming Frequencies

Boost switching and PWM dimming frequencies can be set via EEPROM when BOOST_FSET_EN = 0 and

PWM_FSET_EN = 0. Available options are shown in Table 11 and Table 12.

Table 11. Configuring Boost Switching Frequency via EPROM

BOOST_FSET_EN

BOOST_FREQ[1:0]

ƒSW [kHz]

312

625

1250

Reserved

Table 12. Configuring PWM Dimming Frequency via EPROM

PWM_FSET_EN

PWM_FREQ[3:0]

ƒPWM [Hz] (Resolution)

0000

4808 (11-bit)

0001

6010 (10-bit)

0010

7212 (10-bit)

0011

8414 (10-bit)

0100

9616 (10-bit)

0101

12020 (9-bit)

0110

13222 (9-bit)

0111

14424 (9-bit)

1000

15626 (9-bit)

1001

16828 (9-bit)

1010

18030 (9-bit)

1011

19232 (9-bit)

1100

24040 (8-bit)

1101

28848 (8-bit)

1110

33656 (8-bit)

1111

38464 (8-bit)

9.1.1.2 Setting Full-Scale LED Current

The LED current per output is configured by programming the CURRENT_MAX and CURRENT registers when

ISET_EN = 0. Available options are shown below.

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