AS3665 datasheet(37/78 Pages) AMSCO

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AS3665

Datasheet, Confidential - D e taile d D e scri pti on In ter r upt Gene rat or

Interrupt Generator

The interrupt generator can send interrupt signals to e.g. the application processor to identify e.g. the end of pattern or

a special event. When a not masked interrupt (register Interrupt_Mask) is triggered the INT/AUDIO_IN

9 pin is pulled

low until the interrupt is reset by the I

2C interface.

Interrupt are readout by the Interrupt_Status register; pending interrupts are reset by writing back ‘1’ to the register bit

in Interrupt_Status which should be reset:

Following procedure to readout the interrupt is recommended:

2.0

1.5

2.0

1.5

2.0

1.5

1.0

1.5

1.0

1.5

1.0

Table 47. Audio_AGC Register

Addr: 1Dh

Audio_AGC Register

Bit

Bit Name

Default Access

Description

2:0

agc_ctrl

000b

R/W

Control AGC transfer function

000

AGC off (bypass)

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

4:3

agc_time

00b

R/W

AGC amplitude detection decay time; minimum duration

from min. gain to max. gain

460ms

920ms

1840ms

3670ms

9. The output should be enabled by setting register int_mode=00 (open drain interrupt output)

Table 46. AGC gain curves

Input Amplitude

AGC gain

curve A

curve B

curve C

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