SWRU125 Page 5
Figure 2: Power switch setting
The Power Switch S3 must be set according to what power source is used. If DC jack or USB
power is applied, the switch should be set to the USB position. If the board is powered from
batteries, the switch should be set to the BATT position as shown in Figure 2. When either
DC power or batteries are used to power the board, the switch can be used as an on/off
switch.
When powering the CC2430DB from batteries, the CC2430 will work down to 1.8V. Please
note that when using USB, the voltage range is limited to 3.0V – 3.6V. The CC2430DB has
been designed for a temperature range of –40
°
C to +85
°
C.
5.2 USB Interface
The USB interface is used to interface to a PC to run the In-Circuit Emulator in the IAR
Embedded Workbench (IAR EW) and using SmartRF
®
Studio. The IAR EW can also be used
to reprogram the CC2430DB (see the IAR EW manual for more details).
Furthermore, it is also possible to reprogram the CC2430DB via the USB interface with the
Chipcon programming software, or to use the board for the Chipcon packet sniffer.
When connected to the USB port the CC2430DB is powered from the USB and no other
voltage supplies are required.
Please refer to the Chipcon Flash Programmer User Manual installed with SmartRF
®
Studio
for a detailed description of how to reprogram the CC2430DB.
5.3 User interface
The CC2430DB includes a joystick and a push button as user input devices, and two LEDs as
user output devices.
5.4 EEPROM
A 32Kbit EEPROM is included for non volatile storage of data that is frequently updated. The
EEPROM has 1 Million guaranteed write cycles.
5.5 Accelerometer
The accelerometer can be used to measure movements in 2 axes. It can also be used for tilt
measurements by measuring the earth’s gravitation. The accelerometer has a 20 ms start-up
time after power on. See the Analog Devices ADXL321 datasheet for details about the
accelerometer.
5.6 Potentiometer
The potentiometer controls the voltage on the analog input pin P0_7 of the CC2430. The
voltage, and thus the potentiometer position, can be measured with the CC2430 A/D
converter.