XECOM
(3)
XE24S100
Using the XE24S100 Power Saving Modes
The XE24S100 includes three low power operating
modes (Sleep, Power-Down and RF Monitor) to
allow the host application to make maximum use of
the available power. The #P command selects the
transceiver operating mode when it is not actively
transmitting
or
receiving
data.
Below
are
descriptions of all of the available selections.
IDLE: In Idle Mode all XE24S100 circuits are
powered and available for immediate action. This
includes the RF receiver which actively monitors
the air for an incoming communications request.
SLEEP: In Sleep Mode all XE24S100 circuits are
powered-down to minimize power consumption.
The XE24S100 cannot accept commands or
respond to incoming RF communications requests
from Sleep mode. Any input on TXD will wake the
transceiver and return it to the previous mode,
either the Idle or Power-Down Mode Current
draw in Sleep Mode is less than 50 microamps.
POWER-DOWN: In Power-Down Mode all RF
circuitry is shut down but the communications
controller remains active to accept AT commands.
The XE24S100 cannot respond to incoming RF
communications requests. If a transmit RF or
receive RF command is received, the XE24S100
can activate the RF section in under 200
microseconds. Current draw in Power-Down
Mode is less than 2 milliamps.
RF MONITOR MODE: RF Monitor Mode holds
the transceiver in power down mode for an interval
set by Register S110. The transcevier then
activates, turns on its receiver, and checks the air
for incoming messages. If no messages are
detected within 200 milliseconds, the transceiver
returns to power down mode. If carrier is detected,
the transceiver completes the transaction before
returning to power down mode. S110 selects an
interval of 1 to 60 seconds. Power consumption in
RF Monitor Mode ranges from 1 to 10 milliamps
depending upon the activation interval.
AT COMMAND CONTROL
The XE24S100 power saving modes are controlled
by the AT#Pn command as described below.
AT#P0
Select Idle mode.
AT#P1
Select Sleep Mode.
AT#P2
Select Power-Down Mode.
AT#P3
Select RF Monitor Mode
RF MONITOR INTERVAL: S110=n
Values of 1 to 60 set the RF Monitor interval in 1
second increments
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