AS3675 datasheet(66/81 Pages) AMSCO

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AS3675

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

Registers 71h to 82h define the filter coefficients filt{1,2,3}_{A0,a1,a2}. Each of the coefficients is 12 bits wide and is

calculated according to the following formula (2s complement number):

- Bit11 is used as sign bit 0…positive number, 1…negative number

- Bit10 is multiplied by 2^0

- Bit9 is multiplied by 2^-1

-…

- Bit 1 is multiplied by 2^-9

7:6

curr33_aud_src[1:0]

00b

R/W

Audio controlled LED source for CURR33

All other modes

ch1 connected to CURR33, audio controlled

LED on

ch2 connected to CURR33, audio controlled

LED on

ch3 connected to CURR33, audio controlled

LED on

Table 86. filt_type

Addr: 70h

filt_type

Define frequency filter types

Bit

Bit Name

Default Access

Description

1:0

filt1_type[1:0]

00b

R/W

Defines filter1 (for ch1) characteristics and filter coefficients

b1 and b2

don’t use

low pass filter; filt1_b1=2, filt1_b2=1

high pass filter; filt1_b1=-2, filt1_b2=1

band pass filter; filt1_b1=0, filt1_b2=-1

3:2

filt2_type[1:0]

00b

R/W

Defines filter2 (for ch2) characteristics and filter coefficients

b1 and b2

don’t use

low pass filter; filt2_b1=2, filt2_b2=1

high pass filter; filt2_b1=-2, filt2_b2=1

band pass filter; filt2_b1=0, filt2_b2=-1

5:4

filt3_type[1:0]

00b

R/W

Defines filter3 (for ch3) characteristics and filter coefficients

b1 and b2

don’t use

low pass filter; filt3_b1=2, filt3_b2=1

high pass filter; filt3_b1=-2, filt3_b2=1

band pass filter; filt3_b1=0, filt3_b2=-1

Table 85. CURR3x audio source

Addr: 53h

CURR3x audio source

Controls CURR30,31,32,33 audio outputs and enables audio controlled LED

Bit

Bit Name

Default Access

Description

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