MC75i Hardware Interface Description
5.9 Electrostatic Discharge
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MC75i_HD_v01.100a
Page 101 of 122
2009-08-13
Confidential / Released
5.9
Electrostatic Discharge
The GSM module is not protected against Electrostatic Discharge (ESD) in general. Conse-
quently, it is subject to ESD handling precautions that typically apply to ESD sensitive compo-
nents. Proper ESD handling and packaging procedures must be applied throughout the
processing, handling and operation of any application that incorporates a MC75i module.
Special ESD protection provided on MC75i:
•
Antenna interface: RF choke connected to ground.
•
SIM interface: clamp diodes for protection against overvoltage.
The remaining ports of MC75i are not accessible to the user of the final product (since they are
installed within the device) and therefore, are only protected according to the "Human Body
Model" requirements.
MC75i has been tested according to the EN 61000-4-2 standard. The measured values can be
gathered from the following table.
Note: Please note that the values may vary with the individual application design. For example,
it matters whether or not the application platform is grounded over external devices like a com-
puter or other equipment, such as the Cinterion Wireless Modules reference application de-
scribed in
Table 39:
Measured electrostatic values
Specification / Requirements
Contact discharge
Air discharge
ETSI EN 301 489-1/7
SIM interface
±
4kV
±
8kV
Antenna interface
(including isolated antenna)
±
4kV
±
8kV
JEDEC JESD22-A114D
All board-to-board interfaces
±
1kV Human Body Model
n.a.