zfsm-201 California Eastern Laboratories, zfsm-201 Datasheet - Page 4

• Manufacturer Part Number: zfsm-201
• Description: Integrated Transceiver Modules For Zigbee / Ieee 802.15.4 Evaluation Kit Available Zfsm-201-kit-1
• Manufacturer: California Eastern Laboratories

MICROPROCESSOR
The primary component of the FreeStar Pro module is Freescale’s third generation ZigBee platform. It incorporates a
complete, low power, 2.4 GHz radio frequency transceiver, 32-bit ARM7TDMI-based microprocessor, hardware acceleration
for both IEEE 802.15.4 MAC and AES security plus a full suite of processor peripherals.
The MC13224V architecture offers superior processing power for ZigBee applications. The core operates up to 26 MHz.
An 80 kByte ROM is utilized for the low level IEEE 802.15.4 MAC and PHYsical layer commands. This off loads the Flash
memory, leaving more space for the end user application. The MC13224V supports 128 kBytes of Flash memory. The
program code is mirrored in 96 kBytes of RAM for faster execution by the processor core. A full set of peripherals and Direct
Memory Access (DMA) capability for transceiver packet data are also included.
In addition, the MC13224V provides extensive power savings options, including low current sleep modes allowing for
maximum operating life when battery-powered.
ANTENNA
FreeStar Pro modules include an integrated PCB trace antenna. An optional MMCX connector can be specified, enabling
connection to a 50-ohm external antenna of the user’s choice. See Ordering Information on page 1.
The PCB antenna employs an F-Antenna topology that is compact and supports an omni-directional radiation pattern.
To maximize antenna efficiency, an adequate ground plane must be provided on the host PCB. Correctly positioned, the
ground plane on the host board under the module will contribute significantly to antenna performance.
The position of the module on the host board and overall design of the product enclosure contribute to antenna perfor-
mance. Poor design affects radiation patterns and can result in reflection, diffraction, and/or scattering of the transmitted
signal.
Here are some design guidelines to help ensure antenna performance:
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Never place the ground plane or route copper traces directly underneath the antenna portion of the module.
Never place the antenna close to metallic objects.
In the overall design, ensure that wiring and other components are not placed near the antenna.
Do not place the antenna in a metallic or metallized plastic enclosure.
Keep plastic enclosures 1cm or more from the antenna in any direction.
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ZFSM-201 Series