Emc And Esd Features - Huawei EM820W Hardware Manual

HUAWEI EM820W HSPA+ PC Embedded Module
Hardware Guide
Item
Clash test
Drop test

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:
Issue 01 (2010-12-09)
Test Condition
Half-sine wave
Peak acceleration: 180 m/s2
Pulse duration: 6 ms
Repetition time: 6 directions. 1000
times for each direction.
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.
Possible spurious emissions radiated by the application to the RF receiver in the
receiver band.
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
−
Length of the SIM interface lines (preferably <10cm).
EMC protection on audio input/output (filters against 900MHz emissions).
Biasing of the microphone inputs.
Ground plane: HUAWEI Wireless recommends a common ground plane for
analog/digital/RF grounds.
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.
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Electrical and Reliability Features
Standard
IEC60068
IEC60068
35