AS3677 datasheet(33/68 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

8.4.6

ALS - Ambient Light Sensing

The ADC converts every 1ms the ambient light sensor signal from pin ALS/GPIO1

4. 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 pro-

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

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

This filtered signal can be readout from the register amb_result<7:0>.

Table 42. Adder Enable 2

Addr: 34h

Adder Enable 2

Enables the adder circuit for the selected current sources

Bit

Bit Name

Default Access

Description

curr1_adder

0R/W

Enables adder circuit for current source CURR1

Normal Operation of the current source

adder_current1 gets added to the current

source current; if curr1_amb_group is not 00,

the adder current is multiplied by the ALS group

selected by curr1_amb_group

curr2_adder

0R/W

Enables adder circuit for current source CURR2

Normal Operation of the current source

adder_current2 gets added to the current

source current; if curr2_amb_group is not 00,

the adder current is multiplied by the ALS group

selected by curr2_amb_group

curr6_adder

0R/W

Enables adder circuit for current source CURR6

Normal Operation of the current source

adder_current3 gets added to the current

source current; if curr6_amb_group is not 00,

the adder current is multiplied by the ALS group

selected by curr6_amb_group

Table 43. Adder Enable 1

Addr: 33h

Adder Enable 1

Enables the adder circuit for the selected current sources

Bit

Bit Name

Default Access

Description

rgb1_adder

0R/W

Enables adder circuit for current source RGB1

Normal Operation of the current source

adder_current1 gets added to the current

source current

rgb2_adder

0R/W

Enables adder circuit for current source RGB2

Normal Operation of the current source

adder_current2 gets added to the current

source current

rgb3_adder

0R/W

Enables adder circuit for current source RGB3

Normal Operation of the current source

adder_current3 gets added to the current

source current

4. adc_select=02h (select ALS/GPIO1 input)

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