Texas Instruments Chipcon CC2420DK, User Manual

Page: 13 / 32

SWRU045 Page 13 of 32
Jumpers
Name Default setting Description
VIO Between pins
6 and 8
Determines how the I/O supply of the CC2420 is supplied
with power. If the jumper is connected between pins 8 and
6, the 1.8V supply is used. If the jumper is connected
between pins 8 and 10, the 3.3V supply is used. If the
jumper is connected between pins 8 and 7, the I/O supply is
driven by the external voltage present on the ExtI pin on the
power connector.
VC Between pins
3 and 5
Determines how the core supply of the CC2420 is supplied
with power. If the jumper is connected between pins 3 and
5, power is supplied by the 1.8V regulator. If the jumper is
connected between pins 3 and 1, the core supply is driven
by the external voltage present on the ExtC pin on the
power connector.
C Between pins
4 and 6
Determines how power is supplied to the board. If the
jumper is connected between pins 4 and 6, the EB is
powered from the power connected to the power connector
or the power jack. If the jumper is connected between pins
6 and 8, the EB is powered from the USB bus. In this case,
the USB port the EB is connected to must be able to supply
500 mA current.
EEPROM
En. Present Determines if USB configuration information is loaded from
EEPROM memory. If removed, the CC2400EB will report
itself as a default USB device. This jumper should always
be present during normal operation.
Microcontroller and FPGA
The CC2400EB has been built around a Cypress USB microcontroller and a Xilinx Spartan II
200E FPGA. This has been done to ensure maximum flexibility and is not representative for a
low-cost CC2420 application.
Both the microcontroller and the FPGA are RAM-based devices, and their configuration is
loaded via the USB interface on power-up. The CC2400EB must therefore be connected to a
PC to function properly.
Four LEDs and two buttons are included on the board for user interface purposes. The LEDs
are driven by the FPGA, while the buttons are connected to both the FPGA and the
microcontroller.
A reset button is provided, which will reset both the microcontroller and the USB interface.
The LEDs are used to indicate status when the CC2400EB is used together with SmartRF
®
Studio.