© 2005-2006 Ezurio Ltd
Data Sheet
9
down the WLAN chipset, and awaits commands from the host or from a script
running on the module. While in powersave mode 5 the host or scripts cannot send
the following commands:
o
SEARCH
o
ATTACH
o
SECURITY
o
AUTHENTICATE
o
KEY
o
DETACH
To gain access to all commands the module must first be changed from powersave mode 5 to
either powersave 1 or powersave 0 mode.
7. Application Information
7.1 External Antenna
A variety of manufacturers can supply external antennae suitable for use with the WISM module as a
diversity or prime antenna.
Users should be aware that the choice of antenna will affect the
qualification of the module.
To ensure that the qualification is not affected, the TOTAL GAIN of the external antenna, including
insertion loss of the connectors and cable must be less than 3dBi. If a higher gain is employed, then
the pre-qualified status of the module will be lost. It is the customer’s responsibility to ensure that an
external antenna does not negate the qualification.
7.2 Power Supply Considerations
The power supply for the Module has to be a single voltage source of Vcc within the range of 3.3 V to
5.0 V. It must be able to provide sufficient current in a transmit burst. This can rise to 550mA.
The Module includes regulators to provide local 3.0V. This rail is accessible on connector J2 for
monitoring purposes only. Under no circumstances should this pin be used to source current.
Power (Vcc) can be provided via the board-to-board connector Pins 28, 29 and 31.
7.3 Power-On-Reset
The Module is provided with an active high reset pin (Hirose 40way DF12C connector pin 13). Upon the
application of power, the Power On Reset circuit built into the Module will ensure that the unit starts
correctly. There is no need for an external power reset monitor.
7.4 Operational Temperature
The Wireless LAN module is designed to meet an operational temperature of -40°C to +85°C in the
standard mode where it is running in IEEE power save mode.
If the module is run in a mode that results in more frequent receive and transmit activity the operating
temperature will need to be derated to ensure that overall module power dissipation limits are not
exceeded. When the ambient temperature rises above 60°C the module should only be operated in
powersave mode 1 or higher.
7.5 Mounting the Module onto the application platform
There are many ways to properly install the Module in the host device. An efficient approach is to
mount the PCB to a frame, plate, rack or chassis. Fasteners can be M1.8 or M2 screws plus suitable
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