SkyeModule Nova Datasheet
-
Preliminary
Page
|
33
Skyetek Inc
1732 Wazee St. Ste 202
Denver, CO 80202
www.skyetek.com
Main 720.328.3425 Fax:720.228.2400
A timing diagram illustrating the I
2
C data transfer is shown in the figure below:
SCL
SDA
Start
7-bit Address
R/W
ACK
8-bit Data
ACK
8-bit Data
ACK/NACK
1 - 7
8
9
1 - 8
9
1 - 8
9
Stop
Figure 10-9: I
2
C Timing Diagram
NOTE
–
Not reading the entire response before sending another command can cause undesired behavior. Always
make sure to read the entire response when using the I
2
C interface.
11
SkyeModule Nova Antenna Options
The SkyeModule Nova has 2 antenna ports to connect external antennas. The ports use an Ultra Miniature
Connector (U.FL) to save space and cost. Any 50 ohm antenna in the appropriate frequency band (865-
868MHz for Europe, 920-928MHz for North America) can be used with the Nova, however to maintain
compliance with FCC/IC regulations, we recommend using those (or similar type) antennas specified in
section 9 of this document in the USA and Canada.
The SkyeModule Nova also uses an advanced Adaptive Antenna Tuning circuit to ensure a quality impedance
match with any antenna. The user can take advantage of this feature by first attaching the antenna to the
port they would like to use, then sending a SkyeTek Protocol command to the Nova for it to execute its tuning
sequence. The Nova will measure the reflected power caused by impedance mismatch and then will
automatically compensate, delivering the maximum power to the antenna while reducing noise in the
system.
NOTE
–
Read range depends on antenna choice and operating environment. Range can vary widely, depending on
your choice of tag inlay and antenna gain.
