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Hardware Overview
The hardware platform of CC2420 ZigBee DK is based on already established Chipcon
CC2420 kits. Detailed information about the hardware and software included in this kit can be
downloaded from the Chipcon CC2420 product site.
http://www.chipcon.com/index.cfm?kat_id=2&subkat_id=12&dok_id=115
Power Supply Section
The power supply section contains two voltage regulators. One is an external 3.3 V regulator
for use by the microcontroller and the I/O pins of the CC2420. The second is an internal
regulator of CC2420 used to generate the 1.8 V supply applied for powering of the CC2420
core.
A diode prevents permanent damage if wrong polarity is applied to the board. There are two
power connectors; a 2.5mm DC jack-type connector allows you to connect an unregulated
battery eliminator easily (the positive supply is on the center pin), and a connector for a 9V
battery on the bottoms side of the PCB. We recommend that 3 or 4 AA or AAA alkaline cells
are used to power the CC2420DB if a suitable battery pack is used.
RS-232 Interface
A serial port is included on the CC2420DB. This port can be used with the Figure 8 Wireless
Z-Trace. The port includes support for RTS/CTS-type hardware flow control (handshaking).
This port is per default always enabled by a jumper. See the jumper settings for
demonstration board control.
Microcontroller and User Interface
The microcontroller used is an AVR ATmega128L from Atmel. This controller has 128 kB of
Flash program memory, 4 kB of SRAM data memory and 4 kB of non-volatile EEPROM data
memory. The controller is interfaced to the CC2420 via its built-in SPI interface as well as few
general-purpose I/O pins.
The MCU is also connected to four LEDs, a joystick and an extra button for user interface
purposes. The different examples use these peripherals differently. An analogue temperature
sensor, a potentiometer and 32 kB of external RAM are also included.
An ISP and a JTAG ICE connector are provided for programming the AVR without using the
serial port. In this case an Atmel AVR JTAG or ISP programmer should be connected to their
respective connectors.
All of the I/O pins are connected to footprints for 2 x 10 pin-row connectors, P3 and P4. These
connectors are compatible with Agilent logic analyzer probes, and can be used either for
testing or for prototyping. For instance, it is possible to add a daughter board containing
additional circuitry using these connectors.
Pin
Signal name in
number
schematic
1
Not Connected
(NC)
2
3
FORCE_ON
Connector P3 pinout
Pin usage
Not Applicable (N/A)
Unregulated supply voltage
(Insert R101 to connect)
RS-232 Force On
SWRU034
AVR pin
N/A
N/A
N/A
Page 10/ 28
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