Texas Instruments CC400DK, Руководство пользователя, Страница: 19 / 22

CC400DK Development kit (rev. 1.5) 2002-09-17 Page 19 of 22
Using the Development Kit
The purpose of the Development Kit is to give users of the integrated transceiver CC400
hands-on experience with the chip. A typical set-up of the evaluation board is shown below.
Each of the evaluation boards is connected to a PC to be programmed by the software.
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How to set up a transmitter.
The data signal that you want to send in transmit mode must be Manchester coded. If you
don’t have Manchester coded signals available, a square wave from a function generator can
be used instead. The signal source shall be connected to the Data I/O port (DIO) at the
evaluation board. The signal must be a square wave from 0 to 3V as shown. Do not apply a
5V signal because it can damage the CC400 chip. The signal from the function generator will
represent either zeroes or ones, and the bit rate will be 1/T, where T is the period time. For
example, when 1.2 kbit/s is used, set the function generator frequency to 1.2 kHz as this will
give a 1.2kbit/s Manchester coded bit stream.
The transmitted signal can be studied on a spectrum analyser, sent out on the antenna (see
note below) or sent to the receiver via a cable with an attenuator attached.
Figure: Equipment set-up in transmit mode.
Antenna
Circuit board
PC
4-10V
Spectrum analyser
DIO
Function generator
3V
0V
T