AS3676 datasheet(48/92 Pages) AMSCO

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AS3676

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

8.4.8

ALS - Ambient Light Sensing

The ADC converts every 1ms the ambient light sensor signal from pin GPIO2/LIGHT

5. This signal is pre-processed

with a offset defined by amb_offset and a gain defined by amb_gain (1/4, 1/2, 1, 2). Then it is low-pass filtered with a

programmable cut-off frequency going from 0.25Hz to 32Hz. Increasing signals and decreasing signal can have indi-

vidual cut-off frequencies adjustable from 0.25Hz to 32Hz (amb_filter_up and amb_filter_down). When setting

amb_on=1, this filter is pre-loaded with the initial value from the ADC to startup the filter at a defined condition.

curr32_adder

0R/W

Enables adder circuit for current source CURR32

Normal Operation of the current source

adder_current3 gets added to the current

source current

curr33_adder

0R/W

Enables adder circuit for current source CURR33

Normal Operation of the current source

adder_current4 gets added to the current

source current

Table 64. Subtract Enable

Addr: 35h

Subtract Enable

Enable the inversion from the signal from the pwm generator

Bit

Bit Name

Default Access

Description

sub_en1

0R/W

Inverts the signal from the pwm generator

Direct Operation (no inversion)

The signal from the pwm generator for which

the adder is enabled (curr1_adder = 1,

curr30_adder = 1, rgb1_adder = 1,

curr41_adder = 1) is inverted

sub_en2

0R/W

Inverts the signal from the pwm generator

Direct Operation (no inversion)

The signal from the pwm generator for which

the adder is enabled (curr2_adder = 1,

curr31_adder = 1, rgb2_adder = 1,

curr42_adder = 1) is inverted

sub_en3

0R/W

Inverts the signal from the pwm generator

Direct Operation (no inversion)

The signal from the pwm generator for which

the adder is enabled (curr6_adder = 1,

curr32_adder = 1, rgb3_adder = 1,

curr43_adder = 1) is inverted

sub_en4

0R/W

Inverts the signal from the pwm generator

Direct Operation (no inversion)

The signal from the pwm generator for which

the adder is enabled (curr33_adder = 1)

is inverted

5. adc_select=0 (select GPIO2/LIGHT input)

Table 63. Adder Enable 2

Addr: 34h

Adder Enable 2

Enables the adder circuit for the selected current sources

Bit

Bit Name

Default Access

Description

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