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HUAWEI EM820W HSPA+ PC Embedded Module
Hardware Guide Electrical and Reliability Features
Issue 01 (2010-12-31)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
35
Item Test Condition Standard
Drop test First case: 0.3 m in height. Drop the
EM820W module on the marble
terrace with one surface facing
downwards twice. Six surfaces
should be tested.
Second case: 0.8 m in height. Drop
the EM820W module on the marble
terrace with one surface facing
downwards twice. Six surfaces
should be tested.
IEC60068
5.7 EMC and ESD Features
EMC tests have to be performed on the application as soon as possible to detect any
potential problems.
When designing, special attention should be paid to:
z
Possible spurious emissions radiated by the application to the RF receiver in the
receiver band.
z
ESD protection that is mandatory on all signals which are externally accessible
Typically, ESD protection is mandatory for the:
− SIM (if accessible from outside)
− Serial link
z
Length of the SIM interface lines (preferably <10cm).
z
EMC protection on audio input/output (filters against 900MHz emissions).
z
Biasing of the microphone inputs.
z
Ground plane: HUAWEI Wireless recommends a common ground plane for
analog/digital/RF grounds.
z
A metallic case or plastic casing with conductive paint is recommended,
except for areas around the antenna.
The HUAWEI EM820W Embedded Module does not include any protection against high
voltage.