SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R26 Design-in
Page 165 of 217
Table 61 reports the u-blox SARA-G3 and SARA-U2 reference designs ESD immunity test results, according to
the CENELEC EN 61000-4-2 [19], ETSI EN 301 489-1 [20], 301 489-52 [21] test requirements.
Contact Discharge
to coupling planes
(indirect contact discharge)
Contact Discharges
to conducted surfaces
(direct contact discharge)
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.
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
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.
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 61: Enclosure ESD immunity level of u-blox SARA-G3 and SARA-U2 reference designs
SARA-G3 and SARA-U2 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 SARA-G3 and SARA-U2 series module, according to the application board classification (see
ETSI EN 301 489-1 [20]), to satisfy the requirements for ESD immunity test summarized in Table 60.
Antenna interface
The ANT pin of SARA-U201 and SARA-G3 series modules provides ESD immunity up to ±4 kV for direct Contact
Discharge and up to ±8 kV for Air Discharge according to IEC 61000-4-2: no further precaution to ESD immunity
test is needed, as implemented in the EMC / ESD approved reference design of SARA-G3 modules.
The ANT pin of SARA-U260, SARA-U270 and SARA-U280 modules provides ESD immunity up to ±2 kV for
direct Contact Discharge and up to ±4 kV for Air Discharge according to IEC 61000-4-2: higher protection level
is required if the line is externally accessible on the device (i.e. the application board where the SARA-U2 module
is mounted).
The following precautions are suggested for satisfying ESD immunity test requirements using SARA-U2 modules:
If the device implements an embedded antenna, the device insulating enclosure should provide protection to
direct contact discharge up to ±4 kV and protection to air discharge up to ±8 kV to the antenna interface
If the device implements an external antenna, the antenna and its connecting cable should provide a
completely insulated enclosure able to provide protection to direct contact discharge up to ±4 kV and
protection to air discharge up to ±8 kV to the whole antenna and cable surfaces
If the device implements an external antenna, and the antenna and its connecting cable do not provide a
completely insulated enclosure able to provide protection to direct contact discharge up to ±4 kV and
protection to air discharge up to ±8 kV to the whole antenna and cable surfaces, an external high pass filter,
consisting of a series 15 pF capacitor (Murata GRM1555C1H150JA01) and a shunt 39 nH coil (Murata
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