TOBY-L1 and MPCI-L1 series - System Integration Manual
UBX-13001482 - R04
Advance Information
Design-in
Page 71 of 90
Maximum ESD sensitivity rating of the
RESET_N
and
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
or
PERST#
application circuit implemented in the EMC / ESD approved reference designs of TOBY-
L1 and MPCI-L1 series modules is described in Figure 25 and Table 16 (section 2.3.2).
SIM interface
The following precautions are suggested for TOBY-L1 and MPCI-L1 series modules SIM interface (
VSIM /
UIM_PWR
,
SIM_RST / UIM_RESET
,
SIM_IO / UIM_DATA
,
SIM_CLK / UIM_CLK
pins), 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
VSIM / UIM_PWR
,
SIM_RST / UIM_RESET
,
SIM_IO / UIM_DATA
and
SIM_CLK / UIM_CLK
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-L1 and
MPCI-L1 series modules is described in Figure 31 and Table 18 (section 2.5).
Other pins and interfaces
All the module pins that are externally accessible on the device integrating a TOBY-L1 or MPCI-L1 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
[7]. 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 related 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
