U)Sim Interface (J303) - Quectel Mini PCIe-C EVB User Manual

Table 8: Pin Definition of J403
Pin No. Pin Name
1 MIC
2 AGND
3 SPK_R
4 SPK_L
5, 6 NC
The following figure shows the sketch design of the CTIA audio plug which suits the audio jack on Mini
PCIe-C EVB.

4.4. (U)SIM Interface (J303)

The Mini PCIe-C EVB provides a 6-pin push-push type (U)SIM interface J303 which supports 1.8V/3.0V
(U)SIM card. Its reference circuit design is shown as below.
Mini_PCIe-C_EVB_User_Guide
Description
Microphone input
Dedicated GND for audio
Right channel of stereo audio output
Left channel of stereo audio output
/
4
3
GND
2
1
SW
Figure 20: Sketch Design of CTIA Audio Plug
UMTS/HSPA+/LTE Standard Module Series
Mini PCIe-C EVB User Guide
SPK_L
32Ω
SPK_R
32Ω
MIC
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