Digi XBee Product Manual

Modes of operation for the XBee/XBee-PRO RF Modules
XBee / XBee-PRO RF Modules 802.15.4 Product Manual 31
Note Customers in Europe who have the XBee 802.15.5 module must manage their CCA settings.
See the ATCA command for CA values.
Acknowledgment
If the transmission is not a broadcast message, the module will expect to receive an acknowledgment
from the destination node. If an acknowledgment is not received, the packet will be resent up to
three more times. If the acknowledgment is not received after all transmissions, an ACK failure is
recorded.
Sleep Mode
Sleep Modes enable the RF module to enter states of low-power consumption when not in use. In
order to enter Sleep Mode, one of the following conditions must be met (in addition to the module
having a non-zero SM parameter value):
• Sleep_RQ (pin 9) is asserted and the module is in a pin sleep mode (SM = 1, 2, or 5)
• The module is idle (no data transmission or reception) for the amount of time defined by the ST
(Time before Sleep) parameter.
Note ST is only active when SM = 4-5.
Table 9: Sleep Mode configurations
Sleep Mode
Setting
Transition into Sleep
Mode
Transition out of Sleep
Mode (wake) Characteristics
Related
Commands
Power
Consumption
Pin
Hibernate
(SM = 1)
Assert (high)
Sleep_RQ (pin 9)
De-assert (low)
Sleep_RQ
Pin/Host-controlled
/ NonBeacon
systems only /
Lowest Power
(SM) < 10 μA (@3.0
VCC)
Pin Doze
(SM = 2)
Assert (high)
Sleep_RQ (pin 9)
De-assert (low)
Sleep_RQ
Pin/Host-controlled
/ NonBeacon
systems only /
Fastest wake-up
(SM) < 50 μA
Cyclic Sleep
(SM = 4)
Automatic transition
to Sleep Mode as
defined by the SM
(Sleep Mode) and ST
(Time before Sleep)
parameters.
Transition occurs after
the cyclic sleep time
interval elapses. The
time interval is defined
by the SP (Cyclic Sleep
Period) parameter.
RF module wakes
in pre-determined
time intervals to
detect if RF data is
present / When SM
= 5
(SM), SP, ST < 50 μA
when
sleeping
Cyclic Sleep
(SM = 5)
Automatic transition
to Sleep Mode as
defined by the SM
(Sleep Mode) and ST
(Time before Sleep)
parameters or on a
falling edge
transition of the
SLEEP_RQ pin.
Transition occurs after
the cyclic sleep time
interval elapses. The
time interval is defined
by the SP (Cyclic Sleep
Period) parameter.
RF module wakes
in pre-determined
time intervals to
detect if RF data is
present. Module
also wakes on a
falling edge of
SLEEP_RQ
(SM), SP, ST < 50 μA
when
sleeping

Digi XBee Specifications

General

Operating Frequency	2.4 GHz
RF Data Rate	250 kbps
Model	XBee S2C
Category	Control Unit
Operating Voltage	2.1 to 3.6V DC
Operating Temperature	-40 to +85 °C
Interface	UART
Dimensions	24.38 x 27.61 x 9.14 mm