ZALM-301-1 Datasheet, PDF (5/19 Pages) California Eastern Labs – APEX LT SERIES TRANSCEIVER MODULES

ZALM-300 Series
APEX LT MODULE microprocessor
APEX LT modules provide a connection to the Ember Serial API over the SPI allowing the application development to be
completed on a host microprocessor of your choice. In addition to the SPI signals, two additional signals (nHOST_INT and
nWAKE) provide a handshake mechanism. The module provides a slave device with all transactions initiated by the host.
Please consult the EM260 datasheet for details on the SPI Protocol including:
• Physical Interface Configuration
• SPI Transactions
• SPI Protocol Timing Parameters & Waveforms
• Data Formatting
• SPI Commands & Responses
D ^{• Handling Resets and Power Cycling}
• Transaction Examples
DE _{TOP VIEW}
N ^{N ANTENNA}
APEX and APEX LT modules include an integrated PCB trace antenna.
An optional MMCX connector can be specified, enabling connection to
E _{IG a 50-ohm external antenna of the user’s choice. See Ordering}
Information.
TOP VIEW
TOP VIEW
M _{S 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
M ^E _{on the host PCB. If positioned correctly, the ground plane on the host board under the module can contribute significantly}
to antenna performance.
O ^D _{The position of the module on the host board and overall design of the product enclosure contribute to antenna perfor-}
mance. Poor design effects radiation patterns and can result in reflection, diffraction, and/or scattering of the transmitted
C _{signal. Measured radiation patterns of these modules are available from California Eastern Labs and can be used to}
E ^{W benchmark design performance.}
E _{Here are some design guidelines to help ensure antenna performance:}
R _{N • 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.
T _{• In the overall design, ensure that wiring and other components are not placed near the antenna.}
O ^{R • Do not place the antenna in a metallic or metallized plastic enclosure.}
N _FO ^{• Keep plastic enclosures 1cm or more from the antenna in any direction.}