AS3676 datasheet(49/92 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

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

Each of the available three channels (N=1, 2 or 3) has six 8-bit registers:

- groupN_y0: define current multiplier for values below groupN_X1

- groupN_y3: define current multiplier for high values (actual starting point defined by groupN_x1,groupN_k1 and

groupN_x2,groupN_k2)

- groupN_x1, groupN_k1: If ADC reading is > groupN_x1 then groupN_k1 divided by 32 defines the slope of the

first ramp

- groupN_x2, groupN_k2: If ADC reading is > groupN_x2 then groupN_k2 divided by 32 defines the slope of the

second ramp

Each current sources has a 2 bit register (currX_amb_group) to select None, Group1, Group2 or Group3 of ambient

light sensing.

The calculations are done every 1ms resulting in a flicker-free 1000Hz update rate of the current sources.

Note: A current source should not use adder or subtractor current at the same time together with ALS (e.g.

curr1_adder=1 and curr1_amb_group=01, 10 or 11). For details see austriamicrosystems application note

AN3676_ALS_with_adder_current.

AS3676 Datasheet(PDF) 49 Page - ams AG