wm8350 Wolfson Microelectronics plc, wm8350 Datasheet - Page 255

• Manufacturer Part Number: wm8350
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

Production Data
Register 48h Input Control
Register 49h IN3 Input Control
w
REGISTER
REGISTER
REGISTER
ADDRESS
ADDRESS
ADDRESS
R74 (4Ah)
R73 (49h)
IN3 Input
Mic Bias
Control
Control
BIT
BIT
BIT
4:2
1:0
15
14
15
14
7
1
0
7
6
MCDSCTHR[1:0]
MIC_DET_ENA
IN3R_SHORT
IN3L_SHORT
MCDTHR[2:0]
IN1LN_ENA
IN1LP_ENA
IN3R_ENA
IN3L_ENA
MICB_ENA
MICB_SEL
LABEL
LABEL
LABEL
DEFAULT
DEFAULT
DEFAULT
1
1
000
0
0
0
0
00
0
0
0
Connect IN1LN pin to left channel input PGA negative
terminal.
0 = IN1LN not connected to input PGA
1 = IN1LN connected to input PGA amplifier negative
terminal.
Connect IN1LP pin to left channel input PGA amplifier
positive terminal.
0 = IN1LP not connected to input PGA
1 = input PGA amplifier positive terminal connected to
IN1LP (constant input impedance)
IN3R Amplifier enable
0 = disabled
1 = enabled
Short circuit internal input resistor for IN3R amplifier.
0 = Internal resistor in circuit.
1 = Internal resistor shorted.
IN3L Amplifier enable
0 = disabled
1 = enabled
Short circuit internal input resistor for IN3L amplifier.
0 = Internal resistor in circuit.
1 = Internal resistor shorted.
Microphone bias enable
0 = OFF (high impedance output)
1 = ON
Microphone bias voltage control:
0 = 0.9 * AVDD
1 = 0.75 * AVDD
Enable MIC detect:
0 = Disabled
1 = Enabled
Threshold for bias current detection
000 = 160μA
001 = 330μA
010 = 500μA
011 = 680μA
100 = 850μA
101 = 1000μA
110 = 1200μA
111 = 1400μA
These threshold currents scale proportionally with
AVDD. The values given are for AVDD=3.3V.
Threshold for microphone short-circuit detection
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD, June 2009, Rev 4.1
REFER TO
REFER TO
REFER TO
WM8350
255