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XE900

Miniature Spread Spectrum Transceiver

Xecom 

Using the XE900SL10 Power Saving Modes

The XE900SL10 includes three low power operating

modes (RF Monitor, Sleep and Power-Down Modes) to

allow the host application to make maximum use of the

available power. The #P command determines how the

transceiver will operate when not being asked to

transmit or receive an RF signal. Below are descriptions

of all of the XE900SL10 operating modes.

IDLE: In Idle Mode all circuits within the XE900SL10 are

powered and available for immediate action. This

includes the RF receiver which actively monitors the air

for an incoming communications request. Current draw

in Idle Mode is typically 18 milliamps.

SLEEP: In Sleep Mode all circuits within the XE900SL10

are powered-down to reduce consumption. The

XE900SL10 will not accept commands or respond to

incoming RF communications requests. Any input on

the TXD line will wake the transceiver and return it either

the Idle or Power-Down Mode which ever mode it was

last in before being put into Sleep Mode. Current draw in

Sleep Mode is less than 40 microamps.

RF Monitor Mode: The XE900SL10 RF monitor mode

has 4 settings. At each of these settings the transceiver

sits in power down mode for a prescribed period of time.

The transceiver then wakes up, turns on its receiver and

checks for incoming messages. If no messages are

received the transceiver returns to power down mode

after about 200 milliseconds. If a carrier is detected, the

transceiver completes the transaction before returning

to power down mode. Intervals of 2 seconds (#P3), 4

seconds (#P4), 8 seconds (#P5) and 16 seconds (#P6)

can be chosen.

RF Receive Mode: In RF Receive Mode the XE900SL10

is actively receiving an incoming 900 MHz data signal.

Current draw in RF Receive Mode is less than 30

milliamps.

RF Transmit Mode: In RF Transmit Mode the

XE900SL10 is actively transmitting a 900 MHz data

signal. Current draw in Transmit mode is no more than

55 milliamps with the transmit output power set to

maximum, 10 milliwatts.

Power-Down: In Power-Down Mode all RF circuitry is

shut down but the communications controller remains

active to accept AT commands. In this mode the

XE900SL10 cannot respond to incoming RF

communications requests. If a Transmit RF or Receive

RF command is received, the XE900SL10 can activate the

RF section in under 200 microseconds. Current draw in

Power-Down Mode is less than 500 microamps.

AT Command Control

The low power modes are controlled by the AT#Pn

command, see below.

AT#P0 - Sets the transceiver to Idle mode.

AT#P1 - Sets the transceiver to Sleep Mode.

AT#P2 - Sets the transceiver for Power-Down Mode.

AT#P3 - RF Monitor Mode (2 second interval)

AT#P4 - RF Monitor Mode (4 second interval)

AT#P5 - RF Monitor Mode (8 second interval)

AT#P6 - RF Monitor Mode (16 second interval)

XECOM

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XE900SL10

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