User's Manual l MBa8MPxL UM 0100 l © 2022, TQ-Systems GmbH
Page 23
3.3.12
Audio
A Texas Instruments TLV320 audio codec is assembled. It is configured via SAI3 and controlled by the I2C2 bus.
The audio codec provides microphone, line in and line out signals at 3.5 mm jacks on the MBa8MPxL.
The supply voltage and signal level operate at 1.8 V. All jack sockets are ESD protected.
Line out can become a headphone output by replacement of resistors R77/78 to R79/80.
TQMA8MPxL
SAI3
I2C2
Audio
Codec
TLV320
3.5 mm
Jack
3.5 mm
Jack
3.5 mm
Jack
MIC
Line-Out
Line-In
Figure 20: Block diagram audio interface
Table 18:
Pinout audio connectors, X15, X16, X17
Jack
Pin
Signal
Remark
X15
MIC
1, 2
AGND_AUDIO
–
4A, 4B
MIC_IN
2.4 kΩ in series to MIC_BIAS; ESD protection
3
AGND_AUDIO
Right channel not used
X16
Line-In
1, 2
AGND_AUDIO
–
4A, 4B
LINE_IN_L
ESD protection
3
LINE_IN_R
ESD protection
X17
Line-Out
1, 2
AGND_AUDIO
–
4A, 4B
AUDIO_OUT_L
ESD protection. Optional connection to HP_L
3
AUDIO_OUT_R
ESD protection. Optional connection to HP_R
