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9XTend? ? OEM ? RF ? Module ?‐? Product ? Manual ? v2.x4x ? [2007.01.04]
Chapter ? 2 ?‐? RF ? Module ? Operation
Once in Pin Sleep, CTS (GPO1) is de-asserted (high), indicating that data should not be sent to the
module. The PWR pin is also de-asserted (low) when the module is in Pin Sleep Mode.
Note: The module will complete a transmission or reception before activating Pin Sleep.
Serial Port Sleep (SM = 2)
? Wake on serial port activity
? Typical power-down current: < 10 mA
Serial Port Sleep is a Sleep Mode in which the module runs in a low power state until serial data is
detected on the DI pin.
The period of time the module sleeps is determined by ST (Time before Sleep) Command. Once a
character is received through the DI pin, the module returns to Idle Mode and is fully operational.
Cyclic Sleep (SM = 4-8)
? Typical Power-down Current: < 1.6 mA (when asleep)
Cyclic Sleep Modes allow modules to periodically wake and check for RF data. The module wakes
according to the times designated by the Cyclic sleep settings. If the module detects a wake-up
initializer during the time it is awake, the module synchronizes with the transmitting module and
receives data after the wake-up initializer runs its duration. Otherwise, the module returns to
Sleep Mode and continues to cycle in and out of activity until a wake-up initializer is detected.
While the module is in Cyclic Sleep Mode, CTS (GPO1) is de-asserted (high) to indicate that data
should not be sent to the module. When the module awakens to listen for data, GPO1 is asserted
and any data received on the DI Pin is transmitted. The PWR pin is also de-asserted (low) when
the module is in Cyclic Sleep Mode.
The module remains in Sleep Mode for a user-defined period of time ranging from 0.5 seconds to
16 seconds (SM parameters 4 through 8). After this interval of time, the module returns to Idle
Mode and listens for a valid data packet for 100 ms. If the module does not detect valid data (on
any frequency), the module returns to Sleep Mode. If valid data is detected, the module transi-
tions into Receive Mode and receives the incoming RF packets. The module then returns to Sleep
Mode after a period of inactivity determined by the ST "Time before Sleep" parameter.
The module can also be configured to wake from cyclic sleep when the SLEEP pin is de-asserted.
To configure a module to operate in this manner, PW (Pin Wake-up) Command must be issued.
Once the SLEEP pin is de-asserted, the module is forced into Idle Mode and can begin transmitting
or receiving data. It remains active until data is no longer detected for the period of time specified
by the ST Command, at which point it resumes its low-power cyclic state.
Cyclic Scanning . Each RF transmission consists of an RF Initializer and payload. The RF initializer
contains initialization information and all receiving modules must wake during the wake-up initial-
izer portion of data transmission in order to be synchronized with the transmitting module and
receive the data.
The cyclic interval time defined by the SM (Sleep Mode) command must be shorter than the interval
time defined by LH (Wake-up Initializer Timer) command.
Figure ? 2 ‐ 08. Correct ? Configuration ? (LH ? > ? SM): ?
The ? length ? of ? the ? wake ‐ up ? initializer ? exceeds ? the ? time ? interval ? of ? Cyclic ? Sleep. ? The ? receiver ? is ?
guaranteed ? to ? detect ? the ? wake ‐ up ? initializer ? and ? receive ? the ? accompanying ? payload ? data.
? ? 2007 ? MaxStream, ? Inc.
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