LARA-R2 series - System Integration Manual
UBX-16010573 - R12
Design-in
Page 126 of 157
Table 52 summarizes the u-blox LARA-R2 series reference designs ESD immunity test results, according to the
CENELEC EN 61000-4-2
ETSI EN 301 489-1
301 489-52
[20] test requirements.
Category
Application
Immunity Level
Remarks
Contact Discharge
to coupling planes
(indirect contact discharge)
Enclosure
+4 kV / –4 kV
Contact Discharges
to conducted surfaces
(direct contact discharge)
Enclosure port
Not Applicable
Test not applicable to u-blox reference design because it
does not provide enclosure surface.
The test is applicable only to equipments providing
conductive enclosure surface.
Antenna port
+4 kV / –4 kV
Test applicable to u-blox reference design because it
provides antenna with conductive & insulating surfaces.
The test is applicable only to equipments providing
antenna with conductive surface.
Air Discharge
at insulating surfaces
Enclosure port
Not Applicable
Test not applicable to the u-blox reference design because
it does not provide an enclosure surface.
The test is applicable only to equipments providing
insulating enclosure surface.
Antenna port
+8 kV / –8 kV
Test applicable to u-blox reference design because it
provides antenna with conductive & insulating surfaces.
The test is applicable only to equipments providing
antenna with insulating surface.
Table 52: Enclosure ESD immunity level of u-blox LARA-R2 series reference designs
LARA-R2 series reference designs implement all the ESD precautions described in section 2.13.3.
2.13.3
ESD application circuits
The application circuits described in this section are recommended and should be implemented in any device that
integrates a LARA-R2 series module, according to the specific application board classification (see
ETSI EN 301
489-1
[19]), to satisfy the requirements for ESD immunity test summarized in Table 51.
Antenna interface
The
ANT1
port of LARA-R2 series modules provides ESD immunity up to ±4 kV for direct Contact Discharge and
up to ±8 kV for Air Discharge: no further precaution to ESD immunity test is needed, as implemented in the EMC
/ ESD approved reference design of LARA-R2 series modules.
The
ANT2
port of LARA-R2 series modules, except LARA-R204 modules, provides ESD immunity up to ±4 kV for
direct Contact Discharge and up to ±8 kV for Air Discharge: no further precaution to ESD immunity test is needed,
as implemented in the EMC / ESD approved reference design of LARA-R2 series modules.
The
ANT2
port of LARA-R204 modules provides ESD immunity up to ±1 kV for direct Contact Discharge and up
to ±2 kV for Air Discharge: higher protection level is required if the line is externally accessible on the device (i.e.
the application board where the LARA-R204 module is mounted). The following precautions are suggested for
satisfying the ESD immunity test requirements for the
ANT2
port, using LARA-R204 modules:
If an embedded secondary antenna is used, the insulating enclosure of the device should provide protection
up to ±4 kV to direct contact discharge and up to ±8 kV to air discharge to the secondary antenna interface
If an external secondary antenna is used, the secondary antenna and its connecting cable should provide a
completely insulated enclosure able to provide protection up to ±4 kV to direct contact discharge and up to
±8 kV to air discharge to the whole secondary antenna and cable surfaces, otherwise it is suggested to provide
an external ultra low capacitance ESD protection (e.g. Infineon ESD0P2RF-02LRH) at the secondary antenna
port, as described in Figure 45 and Table 35 (section 2.4).
The antenna interface application circuit implemented in the EMC / ESD approved reference designs of LARA-R2
series modules is described in Figure 45 and Table 35 (section 2.4).
