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AS3665
Datasheet, Confidential - D e t a i l e d D e s c r i p t i o n I n t e r r u p t G e n e r a t o r
Table 46. AGC gain curves
Input Amplitude
AGC gain
curve A
curve B
curve C
7
8
9
10
11
12
13
14
15
2.0
2.0
1.5
1.5
1.5
1.0
1.0
1.0
1.0
2.0
2.0
2.0
1.5
1.5
1.5
1.0
1.0
1.0
1.5
1.5
1.5
1.0
1.0
1.0
1.0
1.0
1.0
Table 47. Audio_AGC Register
Addr: 1Dh
Audio_AGC Register
Bit
Bit Name
Default Access
Description
Control AGC transfer function
000
001
010
AGC off (bypass)
attenuate low amplitude signals otherwise linear
response (to remove e.g. noise)
AGC curve A; slow decay of amplitude detection
2:0
agc_ctrl
000b
R/W
011
AGC curve A; fast decay of amplitude detection
100
101
110
111
AGC curve B; slow decay of amplitude detection
AGC curve B; fast decay of amplitude detection
AGC curve C; slow decay of amplitude detection
AGC curve C; fast decay of amplitude detection
AGC amplitude detection decay time; minimum duration
from min. gain to max. gain
00
460ms
4:3
agc_time
00b
R/W
01
920ms
10
11
1840ms
3670ms
a special event. When a not masked interrupt (register Interrupt_Mask ) is triggered the INT/AUDIO_IN pin is pulled
low until the interrupt is reset by the I C interface.
Interrupt Generator
The interrupt generator can send interrupt signals to e.g. the application processor to identify e.g. the end of pattern or
9
2
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:
9. The output should be enabled by setting register int_mode =00 (open drain interrupt output)
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