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AirPrime Embedded Module Hardware Integration Guide
Note: The module unit
defaults to the Normal
state when VCC is first
applied in the absence of
.
W_Disable# control
Note: The difference
between the Discon-
nected and Off states is
that, in the Off state, the
module is still connected to
the power source and
draws minimal current.
14
This guide provides specific recommendations where needed, however, the level
of protection required depends on your application.
Note: ESD protection is highly recommended for the USIM connector at the point where
the contacts are exposed, and for any other signals from the host interface that would be
subjected to ESD by the user of the product.
Module power states
The module has four power states:
•
Disconnected
No power to the module.
•
Off
Power to the module, but the module is powered off.
•
Normal
The module is active. Several modes are possible (Receive, Transmit, Sleep,
Shutdown).
•
Low power ("airplane mode")
The module is active, but RF is disabled.
State machines are implemented in the module to monitor the power supply and
operating temperature.
Disconnected state
This state occurs when there is no power to the module—the host power source
is disconnected from the module and all voltages associated with the module are
at 0 V.
Whether the host device is also powered off depends on the power rail design:
•
If the connection between the power rail and the module is controlled by the
host, the host can stay powered on and cut the power to put the module into
the disconnected state.
•
If the power rail is shared between the host device and the module, the host
is powered off when the module is powered off.
Off state
In this state, the host is powered up and the module is powered down (but still
connected to the power source).
The host keeps the module powered off by driving the W_Disable# signal low. In
this state, the module draws minimal current.
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