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XE5690G

Smart Spread Spectrum Transceiver

Xecom 

Using the XE900S-500 Power Saving Modes

The XE900S-500 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 determines how the

transceiver will operate when not being asked to

transmit or receive an RF signal. Below are descriptions

of all of the XE900S-500 operating modes.

IDLE: In Idle Mode all circuits within the XE900S-500 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 23 milliamps.

SLEEP: In Sleep Mode all circuits within the XE900S-500

are powered-down to reduce consumption. The

XE900S-500 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 100 microamps.

RF Monitor Mode: The XE900S-500 includes 4 RF

monitor modes. In each of these RF Monitor modes 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 selected.

RF Receive Mode: In RF Receive Mode the XE900S-500

is actively receiving an incoming 900 MHz data signal.

Current draw in RF Receive Mode is typically 35

milliamps.

RF Transmit Mode: In RF Transmit Mode the XE900-500

is actively transmitting a 900 MHz data signal. Current

draw in Transmit mode is no more than 1000 milliamps

with the transmit output power set to maximum, 500

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

XE900S-500 cannot respond to incoming RF

communications requests. If a transmit RF or Receive RF

command is received, the XE900S-500 can activate the

RF section in under 200 microseconds. Current draw in

Power-Down Mode is less than 800 microamps.

AT Command Control

The power saving 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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XE900S-500

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