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Enfora Enabler IIIG M2M
Modem Integration Guide
6.4. Circuit Protection
Other than very low level ESD protection within the module’s integrated circuits, the module does
not have any protection against ESD events or other excursions that exceed the specified
operating parameters.
Generally, ESD protection (typically TVS/Transzorb devices) should be added to all signals that
leave the host board. This includes V
BAT
/V
CC
.
Series resistors (typically 47
Ω
) can also be added in series with data lines to limit the peak
current during a voltage excursion.
NOTE:
DO NOT ADD SERIES RESISTANCE TO THE SIM ELECTRICAL LINES.
Minimum ESD Protection Levels
ESD/Input Voltage
Pin #’s
ESD Test Method
Min
Nom/
Avg
High/
Peak
Units
Pins 11 – 24,
26-34, 36, 38,
40, 42, 48, 50,
52, 58, 60, 62,
64, 66,68, 70,
72, 78, 80, 82
Human Body Model
EIA/JEDEC22-A114-A
500
V
Charge Device Model
EIA/JEDEC22-C101-A
200
V
Pins (all
VBUS/PWR),
5 – 10, 35, 37,
47, 49, 51, 52,
53, 55 – 57, 59,
61, 63, 65, 67
Human Body Model EIA/JEDEC22-
A114-A
2000
V
Charge Device Model EIA/JEDEC22-
C101-A
500
V
RF Antenna
IEC 61000-4-2
8000
V
Caution – It is the Integrator’s responsibility to protect
the Enabler IIIG module from electrical disturbances
and excursions, which exceed the specified operating
parameters.
GSM0308IG002
34
Version 1.05 – 11/13/08
