AS3687 datasheet(42/55 Pages) AMSCO

42 / 55 page

AS3687/87XM

Datasheet

www.austriamicrosystems.com/AS3687

1v3-4

41 - 54

7.6.2 Audio Control Registers

Audio Control (only AS3687XM)

Addr: 46h

Audio Controlled LED Mode control

Bit

Bit Name

Default

Access

Description

aud_buf_on

R/W

Audio input buffer enable

0 off

1 on

4:2

audio_color

000b

R/W

audio controlled LED color selection

000 color scheme defined by lookup table

001-111 fixed color scheme (b2=R, b1=G, b0=B) – single

color only (e.g. Red: 100b)

7:6

audio_speed

00b

R/W

Audio controlled LED persistence time

00 none

01 200ms

10 400ms

11 800ms

Audio Input (only AS3687XM)

Addr: 47h

Audio controlled LED input control

Bit

Bit Name

Default

Access

Description

2:0

audio_gain

000b

R/W

Audio input buffer gain control

000 -12dB

001 -6dB

010

0dB

011 +6dB

100 +12dB

101 +18dB

110 +24dB

111 +30dB

5:3

agc_ctrl

000b

R/W

Audio input buffer AGC function

controls AGC transfer function

000

AGC off

001

attenuate low amplitude signals otherwise linear

response (to remove e.g. noise)

010

AGC curve A; slow decay of amplitude detection

011

AGC curve A; fast decay of amplitude detection

100

AGC curve B; slow decay of amplitude detection

101

AGC curve B; fast decay of amplitude detection

110

AGC curve C; slow decay of amplitude detection

111

AGC curve C; fast decay of amplitude detection

audio_man_start

R/W

Startup Control of audio input buffer (for charging of

external AC-coupling capacitor)

0 automatic precharging 300us (if audio_dis_start = 0)

1 continuously precharging (if audio_buf_on = 1)

audio_dis_start

R/W

Disable Startup Control of audio input buffer

0 precharging enabled

1 precharging disabled

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