Integration Manual

LISA-U series - System Integration Manual
3G.G2-HW-10002-A3 Preliminary Design-In
Page 126 of 160
2.5 ESD precautions
2.5.1 ESD immunity test overview
The immunity of the device (i.e. the application board where LISA-U series module is mounted) to the
Electrostatic Discharge (ESD) must be certified in compliance to the testing standard CENELEC EN 61000-4-2 [10]
and the radio equipment standards ETSI EN 301 489-1 [11], ETSI EN 301 489-7 [12], ETSI EN 301 489-24 [13],
which requirements are summarized in Table 47.
The ESD immunity test is performed at the enclosure port, defined by ETSI EN 301 489-1 [11] as the physical
boundary through which the electromagnetic field radiates. If the device implements an integral antenna, the
enclosure port is seen 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 ESD immunity test to the whole device depends on the device classification as defined by ETSI
EN 301 489-1 [11]. Applicability of 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 [11].
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 [10].
For the definition of integral antenna, removable antenna, antenna port, device classification refer to
ETSI EN 301 489-1 [11].
The contact and air discharges are defined in CENELEC EN 61000-4-2 [10].
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 47: Electromagnetic Compatibility ESD immunity requirements as defined by standards CENELEC EN 61000-4-2, ETSI EN
301 489-1 V1.8.1, ETSI EN 301 489-7 V1.3.1, ETSI EN 301 489-24 V1.4.1
2.5.2 ESD immunity test of LISA-U series reference design
Although electromagnetic compatibility (EMC) certification must be performed by the final application of the
radio equipment under test (i.e. the application board where LISA-U series module is mounted), EMC
certification (including ESD immunity) have been successfully performed on LISA-U1 series and LISA-U200-00
modules reference design according to CENELEC EN 61000-4-2 [10], ETSI EN 301 489-1 [11], ETSI EN 301 489-7
[12] and ETSI EN 301 489-24 [13] standards.
The EMC approved reference design consists of a LISA-U1 series or a LISA-U200-00 module soldered on a
motherboard which provides an interface to power supply, SIM card, headset and communication port. An
external antenna is connected to an SMA connector provided on the motherboard.
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 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.
The reference application implements all precautions described in the section 2.5.3. ESD immunity test results
and applicability are reported in Table 48 according to test requirements CENELEC EN 61000-4-2 [10],
ETSI EN 301 489-1 [11], ETSI EN 301 489-7 [12] and ETSI EN 301 489-24 [13].