SC624AEVB datasheet(17/23 Pages) SEMTECH

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SC624A

Address

Reset

Value

Description

0x00

FADE_1

FADE_0

FADE_EN

BL_4

BL_3

BL_2

BL_1

BL_0

0x00

Backlight

Current

Control

0x01

0(1)

BLEN_4

BLEN_3

BLEN_2

BLEN_1

0x00

Backlight

Enable Control

0x03

0(1)

LDO2_2

LDO2_1

LDO2_0

LDO1_3

LDO1_2

LDO1_1

LDO1_0

0x00

LDO Control

Note:

(1)

0 = always write a 0 to these bits

Backlight Current Control Register (0x00)

This register is used to set the currents for the backlight

current sinks, as well as to enable and set the fade step

rate. These current sinks need to be enabled in the

Backlight Enable Control register to be active.

FADE[1:0]

These bits are used to set the rise/fall rate between two

backlight currents as follows:

FADE_1

FADE_0

Fade Feature

Rise/Fall Rate

(ms/step)

The number of steps in changing the backlight current will

be equal to the change in binary count of bits BL[4:0].

FADE_EN

This bit is used to enable or disable the fade feature. When

the fade function is enabled and a new backlight current

is set, the backlight current will change from its current

value to a new value set by bits BL[4:0] at a rate of 8ms to

32ms per step. A new backlight level cannot be written

during an ongoing fade operation, but an ongoing fade

operation may be cancelled by resetting the fade bit.

Clearing the fade bit during an ongoing fade operation

changes the backlight current immediately to the value

of BL[4:0]. The number of counts to complete a fade

operation equals the difference between the old and new

backlight values to increment or decrement the BL[4:0]

bits. If the fade bit is cleared, the current level will change

immediately without the fade delay. The rate of fade may

be changed dynamically, even while a fade operation is

active, by writing new values to the FADE_1 and FADE_0

bits. The total fade time is determined by the number of

steps between old and new backlight values, multiplied

by the rate of fade in ms/step. The longest elapsed time

for a full scale fade-out of the backlight is nominally 1.024

seconds when the default interval of 32ms is used.

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