wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 141

• Manufacturer Part Number: wm8918
• Description: Ultra Low Power Dac For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

Production Data
Register 25h DMIC Digital Volume Right
Register 26h DMIC Digital 0
Register 27h Digital Microphone 0
w
DMIC Digital
DMIC Digital
Microphone
REGISTER
REGISTER
REGISTER
ADDRESS
ADDRESS
ADDRESS
R37 (25h)
R38 (26h)
R39 (27h)
Volume
Digital
Right
0
0
BIT
BIT
BIT
7:0
6:5
12
11
8
4
1
0
DMICR_VOL[7:
AIFTXL_DATIN
DMIC_HPF_C
AIFTXR_DATI
DMIC_SRC
DMIC_HPF
DMIC_ENA
DMIC_VU
LABEL
LABEL
UT[1:0]
LABEL
NV
0]
V
1100_0000 Right Digital Microphone Volume
DEFAULT
DEFAULT
DEFAULT
00
0
1
0
0
0
0
Digital Microphone Volume Update
Writing a 1 to this bit will cause left and right DMIC
volume to be updated simultaneously
00h = Mute
01h = -71.625dB
02h = -71.250dB
… (0.375dB steps)
C0h = 0dB
… (0.375dB steps)
EFh to FFh = +17.625dB
DMIC Digital High Pass Filter Cut-Off Frequency (fc)
00 = Hi-fi mode (fc=4Hz at fs=48kHz)
01 = Voice mode 1 (fc=127Hz at fs=16kHz)
10 = Voice mode 2 (fc=130Hz at fs=8kHz)
11 = Voice mode 3 (fc=267Hz at fs=8kHz)
(Note: fc scales with sample rate.)
DMIC Digital High Pass Filter Enable
0 = Disabled
1 = Enabled
Left Digital Microphone Invert
0 = Left DMIC output not inverted
1 = Left DMIC output inverted
Right Digital Microphone Invert
0 = Right DMIC output not inverted
1 = Right DMIC output inverted
Digital Microphone mode
0 = Disabled
1 = Audio DSP input is from digital microphone
interface
When DMIC_ENA = 0, the Digital microphone clock
(DMICCLK) is held low.
Selects Digital Microphone Data Input pin
0 = IN1L/DMICDAT1
1 = IN1R/DMICDAT2
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD, Rev 4.0, September 2010
REFER TO
REFER TO
REFER TO
WM8918
141