[AK4634]
Addr Register Name
11H Digital Filter Select 1
D7
0
R
0
D6
0
R
0
D5
LPF
R/W
0
D4
HPF
R/W
1
D3
0
R
0
D2
0
R
0
D1
0
R
0
D0
HPFAD
R/W
1
R/W
Default
HPFAD: HPF Enable in ADC block
0: Disable
When HPFAD bit is “0”, HPFAD block is bypassed (0dB).
1: Enable (default)
When HPFAD bit is “1”, F1A13-0, F1B13-0 bits are enabled.
HPFAD bit should be “1”at PMADC bit = “1”.
HPF: HPF Enable in Filter block.
0: Disable
When HPF bit is “0”, HPF block is bypassed (0dB).
1: Enable (default)
When HPF bit is “1”, F1A13-0, F1B13-0 bits are enabled.
LPF: LPF Coefficient Setting Enable
0: Disable (default)
When LPF bit is “0”, LPF block is bypassed (0dB).
1: Enable
When LPF bit is “1”, F2A13-0, F2B13-0 bits are enabled.
Addr Register Name
1CH HPF Co-efficient 0
1DH HPF Co-efficient 1
1EH HPF Co-efficient 2
1FH HPF Co-efficient 3
R/W
D7
F1A7
0
F1B7
0
D6
F1A6
0
F1B6
0
D5
F1A5
F1A13
F1B5
F1B13
W
D4
F1A4
F1A12
F1B4
F1B12
W
D3
F1A3
F1A11
F1B3
F1B11
W
D2
F1A2
F1A10
F1B2
F1B10
W
D1
D0
F1A1
F1A9
F1B1
F1B9
W
F1A0
F1A8
F1B0
F1B8
W
W
W
Default
F1A13-0 bits = 0x1F16, F1B13-0 bits = 0x1E2B
F1A13-0, F1B13-0: FIL1 (Wind-noise Reduction Filter) Coefficient (14bit x 2)
Default: F1A13-0 bits = 0x1F16, F1B13-0 bits = 0x1E2B
fc = 75Hz@fs = 8kHz, 150Hz@fs = 16kHz
Addr Register Name
D7
BPCNT
R/W
0
D6
0
R
0
D5
0
R
0
D4
0
R
0
D3
0
R
0
D2
0
R
0
D1
BPFR1
R/W
0
D0
BPFR0
R/W
0
20H
BEEP Frequency
R/W
Default
BPFR1-0: BEEP Signal Output Frequency Setting (Table 38 ~ Table 40)
Default: “00”
BPCNT: BEEP Signal Output Mode Setting
0: Once Output Mode (default)
1: Continuous Mode
In continuous mode, the BEEP signal is output while BPCNT bit is “1”.
In output mode, the BEEP signal is output by only the frequency set with BPTM6-0 bits.
Rev. 0.5
2007/10
- 69 -
AKM [ ASAHI KASEI MICROSYSTEMS ]
