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Operation
SP (Cyclic Sleep Period)
n
DP (Disassociated Cyclic Sleep Period)
n
Sleep current
The following table shows the sleep current during the XBee/XBee-PRO S2C 802.15.4 RF Module sleep
modes.
Sleep mode
Pin sleep
Cyclic sleep
Cyclic sleep with pin wake-up
You can make devices use low sleep current by driving PWM outputs high during sleep and by using
internal pull-ups/pull-downs on disabled/unused pins. The sleep pins are set up for sleeping as
specified in
Sleep
pins. Additionally, pins that are outputs (other than PWM outputs) continue to output
the same levels during sleep. Normally, this means that pins configured for output high or low will
output high or low accordingly. However, if the output is overridden by I/O line passing, then the
overridden output level is maintained during the sleep time.
Sleep pins
The following table describes the three external device pins associated with sleep. For more details
about the pins, see
Pin
Pin name
number Description
SLEEP_
TH pin
RQ
9/SMT
pin 10
CTS
TH pin
12/SMT
pin 25
ON_
TH pin
SLEEP
13/SMT
pin 26
Direct and indirect transmission
There are two methods to transmit data:
Direct transmission: data is transmitted immediately to the Destination Address
n
Indirect transmission: a packet is retained for a period of time and is only transmitted after the
n
destination device (source address = destination address) requests the data.
XBee/XBee-PRO S2C 802.15.4 RF Module User Guide
Pin
signals.
For SM = 1, high puts the device to sleep and low wakes it up. For SM = 5, a
high to low transition wakes the device up for ST time. The device ignores a
low to high transition in SM = 5.
If D7 = 1, high indicates that the device is asleep and low indicates that it is
awake and ready to receive serial data.
Low indicates that the device is asleep and high indicates that it is awake and
ready to receive serial data. For the XBee/XBee-PRO S2C 802.15.4 RF Module,
this pin cannot be configured to anything different.
SM command setting
1
4
5
Sleep support
Sleep current
<1 µA @ 25ºC
<1 µA @ 25ºC
<1 µA @ 25ºC
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