Sierra Wireless MC5720, Hardware Integration Manual, Page: 11 / 30

2: Power Interface
2
Overview of operation
Note: This chapter contains information for both the CDMA (MC5720)
and GSM (MC8755/8765) modules.
Information that is unique to one module type is clearly identified.
The module is designed to use a 3.3V (nominal) power supply,
provided by the host. It is the host’s responsibility to provide
safe and continuous power to the module at all times; the
module does NOT have an independent power supply, or
protection circuits to guard against electrical issues.
The module’s power state is controlled by the host’s assertion/
de ‐ assertion of the
W_Disable#
signal. The module also
monitors its supply voltage and requests shutdown if the
supply is insufficient.
Power signals
The module must be connected to a 3.3V power supply (as
indicated in PCI Express Mini Card Electromechanical Specifi ‐
cation Revision 1.1 ).
The MC8755/8765 has more power pins than the MC5720 due
to higher peak current requirements for GSM devices.
For detailed pinout and voltage / current requirements of these
modules, refer to MC5720 MiniCard Product Specification
(Document 2130599) and MC8755/MC8765 PCI Express
MiniCard Product Specification (Document 2130637) .
Electrostatic discharge (ESD)
You are responsible for ensuring that the host has adequate
ESD protection on digital circuits and antenna ports:
•
(Operational) RF port (antenna launch and RF connector):
IEC ‐ 61000 ‐ 4 ‐ 2 — Level (Electrostatic Discharge Immunity Test)
•
(Non ‐ operational) Host connector interface:
JESD22 ‐ A114 ‐ B +/ ‐ 1kV Human Body Model and
JESD22 ‐ C101 +/ ‐ 125 V Charged Device Model
Specific recommendations are provided where needed in this
guide, however, the level of protection required depends on
your application.
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