LP8550TLESLASHNOPB datasheet(31/49 Pages) TI1

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LP8550

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SNVS657E – SEPTEMBER 2010 – REVISED SEPTEMBER 2014

8.6.2.2 EEPROM Address 0

Address A0h

EEPROM ADDRESS 0 REGISTER

CURRENT[7:0]

Name

Bit

Access

Description

CURRENT

7:0

R/W

Backlight current adjustment. If EN_I_RES = 0 the maximum backlight current is

defined only with these bits as described below. If EN_I_RES = 1, then the external

resistor connected to ISET pin also scales the LED current. With a 16-k

Ω resistor and

CURRENT set to 7Fh, the output current is then 23 mA.

EN_I_RES = 0

EN_I_RES = 1

0000 0000

0 mA

0000 0001

0.12 mA

(1/255) x 600 x 1.23V/RISET

0000 0010

0.24 mA

(2/255) x 600 x 1.23V/RISET

...

0111 1111

15.00 mA

(127/255) x 600 x 1.23V/RISET

...

1111 1101

29.76 mA

(253/255) x 600 x 1.23V/RISET

1111 1110

29.88 mA

(254/255) x 600 x 1.23V/RISET

1111 1111

30.00 mA

(255/255) x 600 x 1.23V/RISET

8.6.2.3 EEPROM Address 1

Address A1h

EEPROM ADDRESS 1 REGISTER

BOOST_FREQ[1:0]

EN_PWM_&_I_CTRL

TEMP_LIM[1:0]

SLOPE[2:0]

Name

Bit

Access

Description

BOOST_FREQ

7:6

R/W

Boost Converter Switch Frequency

00 = 156 kHz

01 = 312 kHz

10 = 625 kHz

11 = 1250 kHz

EN_PWM_&_I_CTRL

R/W

Enable PWM & Current Control

0 = PWM control used with constant current

1 = Automatic PWM & Current Control enabled

TEMP_LIM

4:3

R/W

Thermal deration function temperature threshold

00 = thermal deration function disabled

01 = 110°C

10 = 120°C

11 = 130°C

SLOPE

2:0

R/W

Slope time for brightness change

000 = Slope function disabled, immediate brightness change

001 = 50 ms

010 = 75 ms

011 = 100 ms

100 = 150 ms

101 = 200 ms

110 = 300 ms

111 = 500 ms

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