RFM23
3.2. Operating Mode Control
There are four primary states in the RFM23 radio state machine: SHUTDOWN, IDLE, TX, and RX (see Figure 6).
The SHUTDOWN state completely shuts down the radio to minimize current consumption. There are five different
configurations/options for the IDLE state which can be selected to optimize the module to the applications needs.
"Register 07h. Operating Mode and Function Control 1" controls which operating mode/state is selected. The TX
and RX state may be reached automatically from any of the IDLE states by setting the txon/rxon bits in "Register
07h. Operating Mode and Function Control 1". Table 11 shows each of the operating modes with the time required
to reach either RX or TX mode as well as the current consumption of each mode.
The output of the LPLDO is internally connected in parallel to the output of the main digital regulator (and is
available externally at the VR_DIG pin); this common digital supply voltage is connected to all digital circuit blocks,
including the digital modem, crystal oscillator, and SPI and register space. The LPLDO has extremely low
quiescent current consumption but limited current supply capability; it is used only in the IDLE-STANDBY and
IDLE-SLEEP modes.
Figure 6. State Machine Diagram
Table 11. Operating Modes
Response Time to
Current in State
State/Mode
xtal
pll
wt
LBD or TS
/Mode [μA]
TX
RX
Shut Down State
X
X
X
X
16.21 ms
16.21 ms
10 nA
Idle States:
Standby Mode
Sleep Mode
Sensor Mode
Ready Mode
Tune Mode
TX State
0
0
0
1
1
1
1
0
0
0
0
1
1
1
0
1
0
0
1.21 ms
1.21 ms
400 nA
800 nA
X
X
X
X
X
1
1 μA
X
X
X
X
210 μs
200 μs
NA
210 μs
200 μs
200 μs
NA
600 μA
9.5 mA
28 mA @ +13 dBm
18.5 mA
RX State
200 μs
16
Tel: +86-755-82973805
Fax: +86-755-82973550
E-mail: sales@hoperf.com
http://www.hoperf.com
HOPERF [ HOPERF ]
