User Guide

15／35
AO Analog Output
PI Power Input
PO Power Output
OC Open Collector
Table 4 Definition of pins on the M3B module
Pin No. Status Pin Name I/O Description Note
1 WAKE# MIC_P* AI
Audio
Input(Positive)
2 3.3Vaux VBAT PI Power Input
3 COEX1 MIC_N* AI
Audio
Input(Negative)
4 GND GND Ground
5 COEX2 SPK_P* AO
Audio
Output(Positive)
6 1.5V — —
7 CLKREQ# SPK_N* AO
Audio
Output(Negative)
8 UIM_PWR USIM_VDD PO
USIM Power
Output
9 GND GND Ground
10 UIM_DATA USIM_DATA IO USIM data signal
11 REFCLK- VDD_EXT PO 1.8V Power Output
uCloudlink M3B Mini PCIe-C _Hardware Design Guide_V1.0
RESERVED