wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 68

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

WM8351
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13.4.6
The WM8351 provides two additional analogue input pins, IN3L and IN3R, for line-level audio or
“beep” signals. Each pin has a simple input buffer whose output signal can be digitised in the audio
ADC and/or mixed into the output signal path. The Right input IN3R may also be connected to the
Output Beep Mixer, for output on OUT2R (see Table 42). The input buffers have a nominal default
gain of -1 (0dB).
Figure 38 Auxiliary Input Buffers
Table 24 Controlling the Auxiliary Input Buffers
R9 (09h)
Power
Mgmt 2
R73 (49h)
IN3 Input
Control
Note: IN3L_ENA and IN3R_ENA can be accessed through R9 or through R73. Reading from or
writing to either register location has the same effect.
REGISTER
ADDRESS
IN3R
IN3L
AUXILIARY INPUTS (IN3L AND IN3R)
IN3R_SHORT, R73[14]
BIT
IN3L_SHORT, R73[6]
10
11
15
14
7
6
20k
20k
IN3L_ENA
IN3R_ENA
IN3L_ENA
IN3R_ENA
IN3L_SHORT
IN3R_SHORT
LABEL
Vmid
Vmid
-
+
-
+
DEFAULT
20k
20k
0
0
0
0
0
0
IN3L Amplifier enable
0 = disabled
1 = enabled
IN3R Amplifier enable
0 = disabled
1 = enabled
IN3L Amplifier enable
0 = disabled
1 = enabled
IN3R Amplifier enable
0 = disabled
1 = enabled
Short circuit internal input resistor for
IN3L amplifier.
0 = Internal resistor in circuit
1 = Internal resistor shorted
Short circuit internal input resistor for
IN3R amplifier.
0 = Internal resistor in circuit
1 = Internal resistor shorted
To:
Right Input Mixer,
Right Output Mixer,
Output Beep Mixer
To:
Left Input Mixer,
Left Output Mixer
DESCRIPTION
PD, June 2009, Rev 4.1
Production Data
68