User Manual

TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R08 Early Production Information Design-in
Page 129 of 158
The antenna interface application circuit implemented in the EMC / ESD approved reference designs of TOBY-L2
and MPCI-L2 series modules is described in Figure 47 in case of antennas detection circuit not implemented, and
is described in Figure 48 and Table 28 in case of antennas detection circuit implemented (section 2.4).
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 Figure 42 and Table 23 (section 2.3.2).
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 Figure 49 and Table 29 (section 2.5).
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 [23]. 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.
The maximum ESD sensitivity rating of all the other pins of the module is 1 kV (Human Body Model according to
JESD22-A114). Higher protection level could be required if the relative pin is externally accessible on the
application board. The following precautions are suggested to achieve higher protection level:
 USB interface: a very low capacitance (i.e. less or equal to 1 pF) ESD protection device (e.g. Tyco Electronics
PESD0402-140 ESD protection device) should be mounted on the USB_D+ and USB_D- lines, close to the
accessible points (i.e. close to the USB connector)
 Other pins: a general purpose ESD protection device (e.g. EPCOS CA05P4S14THSG varistor array or EPCOS
CT0402S14AHSG varistor) should be mounted on the related line, close to accessible point