WM9090
Production Data
w
PD, November 2010, Rev 4.1
30
REGISTER
ADDRESS
BIT LABEL
DEFAULT
DESCRIPTION
R99 (63h)
AGC Control
1
15
AGC_PWR_ENA
1
Enable AGC Power Limit Mode
0 = Disabled
1 = Enabled
12
AGC_PWR_AVG
0
AGC Power Measurement mode
0 = Instantaneous power
1 = RMS power
11:8
AGC_PWR_THR [2:0]
0000
AGC Power Limit Threshold
Sets the output level at which
Power limiting will be applied.
Assumes RMS power mode and
8ohm speaker.
0000 = 300mW
0001 = 350mW
0010 = 400mW
0011 = 450mW
0100 = 500mW
0101 = 550mW
0110 = 600mW
0111 = 650mW
1000 = 700mW
1001 = 750mW
1010 = 800mW
1011 = 850mW
1100 = 900mW
1101 = 950mW
1110 = 1000mW
1111 = 1050mW
6:4
AGC_PWR_ATK [2:0]
000
AGC Power Limiting Attack Rate
Sets the rate of AGC gain reduction
when power limiting is applied
000 = 120ms/6dB
001 = 480ms/6dB
010 = 840ms/6dB
011 = 1200ms/6dB
100 = 1680ms/6dB
101 = 2040ms/6dB
110 = 2760ms/6dB
111 = 4080ms/6dB
2:0
AGC_PWR_DCY [2:0]
000
AGC Power Limiting Decay Rate
Sets the rate of AGC gain
increments after a period of power
limiting
000 = 1080ms/6dB
001 = 1200ms/6dB
010 = 1320ms/6dB
011 = 1680ms/6dB
100 = 2040ms/6dB
101 = 2760ms/6dB
110 = 4080ms/6dB
111 = 8160ms/6dB
Table 14 AGC Power Limit Control
