LARA-R2 series - System Integration Manual
UBX-16010573 - R12
Design-in
Page 125 of 157
2.13
ESD guidelines
The sections 2.13.1 and 2.13.2 are related to EMC / ESD immunity. The modules are ESD sensitive devices and the
ESD sensitivity for each pin (as Human Body Model according to JESD22-A114F) is specified in the
LARA-R2 series
Data Sheet
[1]. Special precautions are required when handling: see section 3.2 for handling guidelines.
2.13.1
ESD immunity test overview
The immunity of devices integrating LARA-R2 series modules to Electro-Static Discharge (ESD) is part of the
Electro-Magnetic Compatibility (EMC) conformity, which is required for products bearing the CE marking,
compliant with the Radio Equipment Directive (2014/53/EU), the EMC Directive (2014/30/EU) and the Low Voltage
Directive (2014/35/EU ) issued by the Commission of the European Community.
Compliance with these directives implies conformity to the following European Norms for device ESD immunity:
the ESD testing standard
CENELEC EN 61000-4-2
[18] and the radio equipment standards
ETSI EN 301 489-1
ETSI EN 301 489-52
[20] , the requirements of which are summarized in Table 51.
The ESD immunity test is performed at the enclosure port, defined by
ETSI EN 301 489-1
[19] as the physical
boundary through which the electromagnetic field radiates. If the device implements an integral antenna, the
enclosure port is defined as all insulating and conductive surfaces housing the device. If the device implements a
removable antenna, the antenna port can be separated from the enclosure port. The antenna port includes the
antenna element and its interconnecting cable surfaces.
The applicability of the ESD immunity test to the whole device depends on the device classification as defined by
ETSI EN 301 489-1
[19]. Applicability of the ESD immunity test to the relative device ports or the relative
interconnecting cables to auxiliary equipments, depends on device accessible interfaces and manufacturer
requirements, as defined by
ETSI EN 301 489-1
Contact discharges are performed at conductive surfaces, while air discharges are performed at insulating surfaces.
Indirect contact discharges are performed on the measurement setup horizontal and vertical coupling planes as
defined in
CENELEC EN 61000-4-2
For the definition of integral antenna, removable antenna, antenna port, device classification, see
ETSI EN
301 489-1
[19], whereas for contact and air discharges definitions, see
CENELEC EN 61000-4-2
Application
Category
Immunity Level
All exposed surfaces of the radio equipment and ancillary equipment in a
representative configuration
Contact Discharge
4 kV
Air Discharge
8 kV
Table 51: EMC / ESD immunity requirements as defined by CENELEC EN 61000-4-2, ETSI EN 301 489-1, 301 489-52
2.13.2
ESD immunity test of u-blox LARA-R2 series reference designs
Although EMC / ESD certification is required for customized devices integrating LARA-R2 series modules for the
European Conformance CE mark, EMC certification (including ESD immunity) has been successfully performed on
LARA-R2 series modules reference design according to the European Norms summarized in Table 51.
The EMC / ESD approved u-blox reference designs consist of a LARA-R2 series module installed onto a motherboard
which provides the supply interface, SIM card and communication port. External LTE/3G/2G antennas are
connected to the provided connectors.
Since an external antenna is used, the antenna port can be separated from the enclosure port. The reference
design is not enclosed in a box so that the enclosure port is not indentified with physical surfaces. Therefore, some
test cases cannot be applied. Only the antenna port is identified as accessible for direct ESD exposure.
