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AC75 Hardware Interface Description
Strictly confidential / Preliminary
5.9
Electrostatic Discharge
The GSM engine is not protected against Electrostatic Discharge (ESD) in general.
Consequently, it is subject to ESD handling precautions that typically apply to ESD sensitive
components. Proper ESD handling and packaging procedures must be applied throughout
the processing, handling and operation of any application that incorporates a AC75 module.
Special ESD protection provided on AC75:
Antenna interface: one spark discharge line (spark gap)
SIM interface: clamp diodes for protection against overvoltage.
The remaining ports of AC75 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.
AC75 has been tested according to the EN 61000-4-2 standard. The measured values can
be gathered from the following table.
Table 35: Measured electrostatic values
Specification / Requirements
ETSI EN 301 489-7
ESD at SIM port
ESD at antenna port
Human Body Model (Test conditions: 1.5k
ESD at all other interfaces
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 computer or other equipment, such as the Siemens reference
application described in Chapter 8.
AC75_HD_V00.202
Contact discharge
± 4kV
± 4kV
Ω
, 100pF)
± 1kV
Page 102 of 120
s
Air discharge
± 8kV
± 8kV
± 1kV
27.04.2006
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