Specifications

XT65/XT75 Hardware Interface Description

7.10 Electrostatic Discharge

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7.10 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 pack-

aging procedures must be applied throughout the processing, handling and operation of any application that

incorporates a XT65/XT75 module.

Special ESD protection provided on XT65/XT75:

• GSM Antenna interface: RF choke decoupled 100nF capacitor

• GPS Antenna interface: RF choke decoupled 100nF capacitor

• SIM interface: clamp diodes for protection against overvoltage.

The remaining ports of XT65/XT75 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.

XT65/XT75 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 computer or other equipment, such as the

Siemens reference application described in Chapter 10.

Table 39: Measured electrostatic values

Specification / Requirements Contact discharge Air discharge

ETSI EN 301 489-7

ESD at SIM port (w/o SIM card)

± 4kV ± 8kV

Human Body Model (Test conditions: 1.5kOhm, 100pF)

ESD at GSM antenna port

± 1kV ± 1kV

ESD at GPS antenna port

± 1kV ± 1kV

ESD at USB Interface

± 1kV ± 1kV

ESD at all other interfaces

± 1kV ± 1kV