wm9714l Wolfson Microelectronics plc, wm9714l Datasheet - Page 92

• Manufacturer Part Number: wm9714l
• Description: Ac?97 Audio Codec
• Manufacturer: Wolfson Microelectronics plc

22h
WM9714L
Register 22h controls the microphone input configuration and microphone bias and detect configuration.
w
REGISTER
ADDRESS
15:14
13:12
11:10
9:8
7
6
5
4:2
1:0
BIT
MICCMP
SEL
MPASEL
MPABST
MPBBST
MBOP2EN
MBOP1EN
MBVOL
MCDTHR
MCDSCTHR
LABEL
00 (mics)
00 (MIC1)
00 (12dB)
00 (12dB)
0 (Off)
1 (On)
0 (0.9xAVDD)
000 (100uA)
00 (600uA)
DEFAULT
MIC2A/MIC2B Pin Function Control
00 = MIC2A and MIC2B are microphone inputs
01 = MIC2A microphone input only
10 = MIC2B microphone input only
11 = MIC2A and MIC2B are not microphone inputs
MPA Pre-Amp Source Control
00 = MIC1
01 = MIC2A
10 = MIC2B
11 = Reserved
MPA Pre-Amp Volume Control
00 = +12dB
01 = +18dB
10 = +24dB
11 = +30dB
MPB Pre-Amp Volume Control
00 = +12dB
01 = +18dB
10 = +24dB
11 = +30dB
MICBIAS Output 2 Enable Control
1 = Enable MICBIAS output on GPIO8 (pin 12)
0 = Disable MICBIAS output on GPIO8 (pin 12)
MICBIAS Output 1 Enable Control
1 = Enable MICBIAS output on MICBIAS (pin 28)
0 = Disable MICBIAS output on MICBIAS (pin 28)
MICBIAS Output Voltage Control
1 = 0.75 x AVDD
0 = 0.9 x AVDD
Mic Detect Threshold Control
000 = 100µA
… (100µA steps)
111 = 800µA
Mic Detect Short Circuit Threshold Control
00 = 600µA
01 = 1200uA
10 = 1800uA
11 = 2400µA
DESCRIPTION
PP, Rev 3.2, October 2008
Pre-Production
Analogue
Inputs,
Microphone
Input
REFER TO
92