HUAWEI ME936 LTE M.2 Module
Hardware Guide
Description of the Application Interfaces
Issue 03 (2017-12-11)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
35
Figure 3-22
Connections of the SIM_DET pin
CD is a pin detecting USIM card in the SIM socket, normally, there will be a detect pin
in the SIM Socket.
The normal short SIM connector should be employed. The logic of SIM_DET pin is
shown as in Figure 3-23 . High represents that SIM is inserted; Low represents
that SIM is removed.
When SIM is inserted (hot), SIM_DET pin will change from Low to High;
When SIM is removed (hot), SIM_DET pin will change from High to Low.
ME936 will detect the rising or falling edge of SIM_DET to react the hot swap.
Figure 3-23
The logic of SIM_DET
Modem
Processor
SIM Connector Switch
SIM installed=
Not Connected
SIM not
installed=
GND
WWAN Module
SIM_DET
1.8V