User's Manual

Page 14 of 31
Figure 2-9 The reference circuit of USIM interface
2.2.5 Audio interface*
The audio signals here include a pair of input difference signals（MIC1_P, MIC1_N）and a pair of output difference
signals (EAR1OP,EAR1OR）. And the Audio interface here includes the earphone jack and the test points.
2.2.5.1 Description
The audio signals offered by U6300 are described in the table 2.7 below.
Table 2.7 U6300 audio signal description
The name of the correlative
pins in
Mini PCIe Interface
SN. of the Mini PCIe
Interface
Description
SPK_OUT_P 5
Audio output data+
SPK_OUT_N 7
Audio output data-
MIC_P 1
Audio input data+
MIC_N 3
Audio input data-
2.2.5.2 The connection between audio I/O and earphone
The audio I/O signals offered by U6300 can be connected to a stereo earphone jack. The more detail information about
connection between earphone jack and the Mini PCIe Interface is shown in table 2.8 below. And the information about
test points is shown in table 2.1 above.
Table 2.8 The connection between earphone jack and the Mini PCIe Interface
The PIN name of
earphone jack
he name of the correlative pins in
Mini PCIe Interface
SN. of the Mini PCIe
Interface
Description
Left Speaker SPK_OUT_P 5
The left output of
stereo
Right Speaker SPK_OUT_N 7
The right output of
stereo
MIC MIC_P 1 The microphone input
PGND GND 50 Analog ground signal