TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R28
Design-in
Page 126 of 164
Antenna interface
The ANT1 and ANT2 ports of TOBY-L2 and MPCI-L2 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-L2
and MPCI-L2 series modules.
The antenna interface application circuit implemented in the EMC / ESD approved reference designs
of TOBY-L2 and MPCI-L2 series modules is described in
in case of antennas detection circuit
not implemented, and is described in
in case of antennas detection circuit
implemented (section
RESET_N and PERST# pin
The following precautions are suggested for the RESET_N and the PERST# line of TOBY-L2 and MPCI-
L2 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
Maximum ESD sensitivity rating of the RESET_N and the PERST# pin is 1 kV (Human Body Model
according to JESD22-A114). Higher protection level could be required if the RESET_N or PERST# pin
is externally accessible on the application board. The following precautions are suggested to achieve
higher protection level:
A general purpose ESD protection device (e.g. EPCOS CA05P4S14THSG varistor array or EPCOS
CT0402S14AHSG varistor) should be mounted on the RESET_N or PERST# line, close to
accessible point
The RESET_N and PERST# application circuit implemented in the EMC / ESD approved reference
designs of TOBY-L2 and MPCI-L2 series modules is described in
SIM interface
The following precautions are suggested for TOBY-L2 and MPCI-L2 series modules SIM interface,
depending on the application board handling, to satisfy ESD immunity test requirements:
A bypass capacitor of about 22 pF to 47 pF (e.g. Murata GRM1555C1H470J) must be mounted on
the lines connected to the SIM interface pins to assure SIM interface functionality when an
electrostatic discharge is applied to the application board enclosure
It is suggested to use as short as possible connection lines at SIM pins
Maximum ESD sensitivity rating of SIM interface pins is 1 kV (Human Body Model according to
JESD22-A114). Higher protection level could be required if SIM interface pins are externally accessible
on the application board. The following precautions are suggested to achieve higher protection level:
A low capacitance (i.e. less than 10 pF) ESD protection device (e.g. Tyco Electronics
PESD0402-140) should be mounted on each SIM interface line, close to accessible points (i.e. close
to the SIM card holder)
The SIM interface application circuit implemented in the EMC / ESD approved reference designs of
TOBY-L2 and MPCI-L2 series modules is described in
(section
Other pins and interfaces
All the module pins that are externally accessible on the device integrating TOBY-L2 and MPCI-L2
series module should be included in the ESD immunity test since they are considered to be a port as
defined in ETSI EN 301 489-1
. Depending on applicability, to satisfy ESD immunity test
requirements according to ESD category level, all the module pins that are externally accessible
should be protected up to
±
4 kV for direct Contact Discharge and up to
±
8 kV for Air Discharge applied
to the enclosure surface.
