AS3677 datasheet(41/68 Pages) AMSCO

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AS3677

Datasheet - D e ta i l e d D e s c r i p t i o n

The range selection generates an interrupt by pulling the pin INT low (if any of the register bit of Interrupt Status are

set, INT is pulled low(. When the register Interrupt Status is readout, the interrupt is automatically cleared:

8.4.7

DLS(=DBC) - Dynamic Luminance Scaling Input

The pins DLS1 and DLS2 can be used for dynamic backlight scaling input. Dynamic backlight scaling is used to reduce

the power of the backlight especially when showing dark picture contents on the display. The control unit to operate

DLS is the display processor sending a PWM signal to the AS3677 and in parallel changing the display content to com-

pensate for a reduced brightness backlight.

The AS3677 can use the DLS (Dynamic Luminance Scaling) (also called DBC = Dynamic Backlight Control) in two dif-

ferent operating modes:

1. Digital DLS Mode - selected by dls_analog=0: The input signal from pins DLS1 and DLS2 are controlling the

current source directly. A logic ‘L’ switches off the selected current source and a logic ‘H’ enables the current

source with the configured current. This operating mode is compatible to the AS3676 processing of DLS.

2. Analog DLS Mode - selected by dls_analog=1: In this operating mode, the input signals form DLS1 and DLS2

are digitally filtered (two parallel filters are possible!) and smoothly controls the current through the selected

Table 73. ALS range low interrupt threshold Register

Addr: AEh

ALS range low interrupt threshold

Bit

Bit Name

Default Access

Description

7:0

amb_range_int_low

00h

R/W

If the filter output amb_result <= amb_range_int_low then

an amb_too_low interrupt is asserted

If amb_range_int_low=0, the interrupt is disabled

Table 74. Interrupt Status Register

Addr: AFh

Interrupt Status

Bit

Bit Name

Default Access

Description

amb_too_high

R/sC

1. Read - self clear. The register automatically clears it content after readout. This avoids any lost interrupts.

Comparator for amb_result >= amb_range_int_high

not triggered

triggered

amb_too_low

R/sC

Comparator for amb_result <= amb_range_int_low

not triggered

triggered

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