SN32F100 Series
32-Bit Cortex-M0 Micro-Controller
SONiX TECHNOLOGY CO., LTD
Page 148
Version 1.9
31:8
Reserved
R
0
7:0
SEARCH_TH_H
AGC Control.
Threshold for activating AGC. High byte.
Once ADC output is larger than the threshold, AGC will update internal
digital gain until the output amplitude is between high bound and low
bound.
R/W
0x03
13.7.8 ADC Setting 8 register (ADC_SET8)
Address Offset: 0x5B0
Bit
Name
Description
Attribute
Reset
31:8
Reserved
R
0
7:0
SEARCH_TH_L
AGC Control.
Threshold for activating AGC. Low byte.
R/W
0x00
13.7.9 ADC Setting 9 register (ADC_SET9)
Address Offset: 0x5C0
Bit
Name
Description
Attribute
Reset
31:8
Reserved
R
0
7:0
MUTE_TH_H
AGC Control.
Threshold for inactivating AGC. High byte
Once ADC output is lower than the threshold
(the check period setting is
MUTE_CAL_POD in ADC_SET11)
, AGC will update internal digital gain
until the PGA and Boost setting are equal to the setting in ADC_SET19.
Then the internal digital gain is adjusted to default value. Finally, the AGC
is entering mute mode until the ADC output is over search threshold in
ADC_SET7 & ADC_SET8.
R/W
0x10
13.7.10 ADC Setting 10 register (ADC_SET10)
Address Offset: 0x5D0
Bit
Name
Description
Attribute
Reset
31:8
Reserved
R
0
7:0
MUTE_TH_L
AGC Control.
Threshold for inactivating AGC. Low byte
R/W
0x00
13.7.11 ADC Setting 11 register (ADC_SET11)
Address Offset: 0x5E0
Bit
Name
Description
Attribute
Reset
31:4
Reserved
R
0
3:0
MUTE_CAL_POD
AGC Control.
The calculating period for inactivating AGC.
Fs : Audio sampling rate
0000: 256/Fs x 2^(0)
0001: 256/Fs x 2^(1)
…….
1110: 256/Fs x 2^(14)
1111: 256/Fs x 2^(15)
AGC will check whether entering mute mode or not according to mute
threshold per (MUTE_CAL_POD) seconds.
R/W
0x09
13.7.12 ADC Setting 12 register (ADC_SET12)
Address Offset: 0x5F0
Bit
Name
Description
Attribute
Reset
31:4
Reserved
R
0
3:0
SAT_TH
AGC Control.
Threshold for ADC saturation condition.
The saturation condition is for sigma-delta ADC, if there are more than
R/W
0x03
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