MRF24XA_15 Datasheet, PDF (239/258 Pages) Microchip Technology – Low-Power, 2.4 GHz ISM-Band IEEE 802.15.4™ RF

MRF24XA
FIGURE 10-1:
MRF24XA POWER MODES DURING DATA POLLING (MESSAGE SEQUENCE
CHART)
Coordinator
(mains powered)
Low-power
(battery-powered)
Duration is...
Listen/
Receive
Deep Sleep
Wake-up
Clear channel
assessment
maximized
minimized
minimized
by sensitive
detector
POLL for pending data
(+ optional piggyback data)
TX/RX OFF
Acknowledge
+ indicate if data is pending
MCU retrieves
the data to send and
loads it for transmission
Waits for data
retrieval (fixed
duration)
RX-to-TX
minimized by zero-
IF architecture
Transmit
minimized by
high data rate and low
framing overhead
TX-to-RX
minimized by
zero-IF
architecture
Listen/
Receive
minimized by
high data rate and low
framing overhead
If data is NOT pending
then Deep Sleep
else
TX/RX OFF
Pending DATA
Listen/Receive
Acknowledge
TRXOFF-to-RX
(start PLL)
Listen/
Receive
RX-to-TX
Transmit
minimized by
high data rate and low
framing overhead
minimized by zero-
IF architecture
minimized by
high data rate and low
framing overhead
 2015 Microchip Technology Inc.
Preliminary
DS70005023C-page 239