Specifications
XBee®/XBee‐PRO®SERFModules
©2009DigiInternational,Inc. 13
20 can enable various join functions without having to send UART commands. Please see the
commissioning pushbutton and associate LED section in chapter 7 for more details. The source
and sink capabilities are limited to 4mA for all pins on the module.
The VREF pin (pin 14) is not used on this module. For compatibility with other XBee modules, we
recommend connecting this pin to a voltage reference if analog sampling is desired. Otherwise,
connect to GND.
Board Layout
XBee modules do not have any specific sensitivity to nearby processors, crystals or other PCB
components. Other than mechanical considerations, no special PCB placement is required for
integrating XBee radios. In general, Power and GND traces should be thicker than signal traces
and be able to comfortably support the maximum currents.
The radios are also designed to be self sufficient and work with the integrated and external
antennas without the need for additional ground planes on the host PCB. Large ground planes on a
host PCB should not adversely affect maximum range, but they may affect radiation patterns of
onboard XBee antennas.
Electrical Characteristics
Smart Energy: What It Means to You
The concept of Smart Energy is to provide utility companies and consumers with the means to
manage consumption with the power and flexibility of wireless networking.
A workgroup of the ZigBee Alliance, known as the Advanced Metering Initiative (AMI) workgroup,
has developed the ZigBee Smart Energy Profile Specification.
A Smart Energy Network consists of a number of devices communicating over a ZigBee mesh
network. Meters, thermostats, switches, appliances, and displays are equipped with wireless RF
transceivers to exchange control and data messages with each other.
A special device manages the network which supports a non-ZigBee gateway interface with the
utility company. Metering data is polled from the Smart Energy network by the utility company for
billing purposes.
Pricing information, alert messages, and load requests are sent by the utility company to the
network.
The consumer interacts with the network by sending control commands and reading messages
from the devices and the utility company.
Security is an important aspect of Smart Energy. Special methods are used to protect the network
from interference or tampering. The Smart Energy RF Module provides each module with means to
communicate with the network's Trust Center. The Trust Center requires other nodes to
authenticate themselves before allowing them to join the network.
See chapter 3 for details.
DCCharacteristicsoftheXBee‐PRO(VCC=3.0‐3.4VDC).
Symbol Parameter Condition Min Typical Max Units
VIL Input Low Voltage All Digital Inputs - - 0.2 * VCC V
V
IH
Input High Voltage All Digital Inputs 0.8 * VCC - - V
V
OL
Output Low Voltage
I
OL
= 2 mA, VCC >= 2.7 V
- - 0.18*VCC V
V
OH
Output High Voltage
I
OH
= -2 mA, VCC >= 2.7 V
0.82*VCC - - V
II
IN
Input Leakage Current
V
IN
= VCC or GND, all inputs, per pin
- - 0.5uA uA