RFM73 Datasheet, PDF (6/27 Pages) List of Unclassifed Manufacturers – Low Power High Performance 2.4 GHz GFSK Transceiver

RFM73 V2.0
4 State Control
4.1 State Control Diagram
 Pin signal: VDD, CE
 SPI register: PWR_UP, PRIM_RX,
EN_AA, NO_ACK, ARC, ARD
 System information: Time out, ACK
received, ARD elapsed, ARC_CNT, TX
FIFO empty, ACK packet transmitted,
Packet received
RFM73 has built-in state machines that
control the state transition between different
modes.
When auto acknowledge feature is disabled,
state transition will be fully controlled by
MCU.
Power Down
PWR_UP=1
Start up time 1.5ms
PWR_UP=0
Time out or ACK received
RX
Standby-I
TX FIFO not empty
CE=1 for more than 15us
ARD elapsed and ARC_CNT<ARC
TX setting 130us
TX finished
CE=0
TX FIFO not empty
CE=1
TX setting 130us
TX
Standby-II
TX FIFO empty
CE=1
EN_AA=1
NO_ACK=0
RX setting 130us
Figure 3 PTX (PRIM_RX=0) state control diagram
Page 6 of 27
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