User’s Manual Wireless Module
Page 7 of 22
C. RF signal input and output:
on-board PCB antenna.
Fig 7
The onboard antenna is designed with tiny space which affects the signal performance. If
the onboard antenna does not satisfy user’s application, please use other external antenna.
Warning:
Should an external antenna rather than the built-in PCB antenna be used, the
OEM integrator is responsible for testing their end-product for any additional
compliance requirements required with this module installed.
2.3 Software and system Information
Operation System
CPU Supplier
Driver
Linux 2.4/2.6
ARM, MIPSII
Available
Windows XP/Vista/7
X86 Platform
Available
Windows CE 5.0/6.0
ARM, MIPSII
Available
Mac OS X
10.3/10.4/10.5/10.6/10.7
N/A Available
2.4. Design Concerns:
2.4.1 Power supply:
1) The input power can be 5.0VDC or 3.3VDC, please mentioned it when place an order.
2) The operation current of 5.0VDC power input will be different with that of 3.3V power
input. The external power shall be well designed with enough current capacity.
3) Should 3.3VDC power be selected, please be sure it’s clean with low ripple; otherwise,
the EMI or RF performance might be deteriorated.
2.4.12 Using pin headers:
1) The pins can be less than 7 pins, but at least the VCC, UD-, UD+, GND must be
applied for USB interface communication.
2) Should the pin header connection be applied, please still keep enough metallic clear
space around the antenna end of the module, this gives better signal performance.
2.4.2 Using semi-holes:
1) When the module is designed to be soldered on a main PCB board directly, the area
under the antenna end of the module should be keep clear of metallic components,
connectors, vias, traces and other materials that can interfere with the radio signal. The
recommended clear space requirements are refer to Fig 8 and Fig 9.
