ZAURA Datasheet, PDF (26/99 Pages) –

ZAURA RF Wireless Library
Programmer’s Reference Manual
14
ACK will be transmitted without performing a carrier sense to determine
if the channel is busy.
Radio States
The ZAURA RF Module’s radio features five different operating states:
Sleep, Standby, Frequency Synthesis, Receive and Transmit. Because the
ZAURA RF Wireless Network is half duplex, it is only possible to send
data while the radio is in the Transmit state, and it is only possible to
receive data while the radio is in the Receive state. Transmit and Receive
states are the two active modes of operation for the radio. The remaining
states are power-saving modes that can be used to reduce the current con-
sumption of the radio when it is not required for active operation.
The radio consumes the least amount of current in the Sleep state (approx-
imately 80 µA) and the most amount of current in the Transmit state (up to
35 mA). The ZAURA RF Library includes API functions to query and set
the state of the radio. The Library automatically transitions the radio to
the Transmit state from whatever state it is currently in when the
ZAURA_RF_Transmit API is called.
The amount of time it takes to initiate a transmit operation depends on the
current state of the radio. If the radio is in a very low power mode (Sleep
state), it will take the ZAURA RF Library longer to initiate the transmit
operation than if the radio is in a medium power state (Frequency Synthe-
sis or Receive). Similarly, it will take longer to transition the radio to the
Receive state from the Sleep state than it will from Standby state.
When the ZAURA RF Wireless Library completes a transmit operation it
automatically transitions the radio to a state corresponding to the value of
the ZAURA_RF_IdleState configuration variable. By default, this vari-
able is set to ZAURA_RF_RECEIVE. However, the application can mod-
ify the value of the ZAURA_RF_IdleState configuration variable to use a
different state such as ZAURA_RF_SLEEP or ZAURA_RF_STANDBY
to reduce the radio’s current consumption.
The ZAURA RF Wireless Library
RM006003-1011