TOBY-L1 and MPCI-L1 series - System Integration Manual
UBX-13001482 - R04
Advance Information
Design-in
Page 70 of 90
Since external antennas are 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 identified with physical surfaces. Therefore,
some test cases cannot be applied. Only the antenna port is identified as accessible for direct ESD exposure.
u-blox TOBY-L1 and MPCI-L1 series reference design implement all the ESD precautions described in
section 2.14.3.
Table 27 reports the u-blox TOBY-L1 and MPCI-L1 series reference designs ESD immunity test results, according
to test requirements stated in the
CENELEC EN 61000-4-2
ETSI EN 301 489-1
ETSI EN 301 489-7
[8] and
ETSI EN 301 489-24
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 equipment 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 equipment 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 equipment 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 equipment providing
antenna with insulating surface.
Table 27: Enclosure ESD immunity level of u-blox TOBY-L1 and MPCI-L1 series modules reference designs
2.14.3
ESD application circuits
The application circuits described in this section are recommended and should be implemented in the device
integrating TOBY-L1 and MPCI-L1 series modules, according to the application board classification (see
ETSI EN
301 489-1
[7]), to satisfy the requirements for ESD immunity test summarized in Table 26.
Antenna interface
The
ANT1
and
ANT2
pins of TOBY-L1 and MPCI-L1 series modules provide 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 TOBY-L1 and MPCI-L1 series modules.
The antenna interface application circuit implemented in the EMC / ESD approved reference designs of TOBY-L1
series modules is described in Figure 30.
RESET_N pin
The following precautions are suggested for the
RESET_N
and
PERST#
line of TOBY-L1 and MPCI-L1 series
modules, depending on the application board handling, to satisfy ESD immunity test requirements:
•
It is recommended to keep the connection line to
RESET_N
and
PERST#
as short as possible
