Circuit Recommended For The Usim Card Interface - Huawei ME909s Series Hardware Manual

HUAWEI ME909s Series LTE Mini PCIe Module
Hardware Guide
Figure 3-12 Logic of USIM_DET
USIM Connector Switch
USIM installed=
Not Connected

3.7.3 Circuit Recommended for the USIM Card Interface

As the Mini PCIe Adapter is not equipped with a USIM socket, you need to place a
USIM socket on the user interface board.
Figure 3-13 shows the circuit of the USIM card interface.
Figure 3-13 Circuit of the USIM card interface
Module
(DCE)
 To meet the requirements of 3GPP TS 51.010-1 protocols and electromagnetic
compatibility (EMC) authentication, the USIM socket should be placed near the
PCIe interface (it is recommended that the PCB circuit connects the PCIe interface
and the USIM socket does not exceed 100 mm), because a long circuit may lead to
wave distortion, thus affecting signal quality.
Issue 02 (2016-09-07)
USIM not
installed=
GND
1 kΩ
USIM - DET
USIM - VCC
USIM - CLK
USIM - DATA
USIM - RESET
470 pF
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
WWAN Module
1.8V
USIM_DET
ESD protection
0 Ω
0 Ω
0 Ω
0 Ω
33 pF 33 pF
33 pF 1 µF
Modem
Processor
USIM
33 pF
28