RF31 Hope Microelectronics co., Ltd, RF31 Datasheet - Page 16

• Manufacturer Part Number: RF31
• Description: Rf31 Ism Receiver
• Manufacturer: Hope Microelectronics co., Ltd

3.2. Operating Mode Control
There are three primary states in the RF31 radio state machine: SHUTDOWN, IDLE, 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 chip to the applications needs.
"Register 07h. Operating Mode and Function Control 1" controls which operating mode/state is selected. The RX
state may be reached automatically from any of the IDLE states by setting the rxon bit in "Register 07h. Operating
Mode and Function Control 1". Table 10 shows each of the operating modes with the time required to reach RX
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.
Idle States:
Shut Down State
State/Mode
Standby Mode
Sensor Mode
Sleep Mode
Ready Mode
Tune Mode
RX State
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xtal
X
0
0
0
1
1
1
pll
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X
0
0
0
0
1
1
Figure 6. State Machine Diagram
Table 10. Operating Modes
wt
X
X
X
X
X
0
1
LBD or TS
X
X
X
X
0
0
1
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Response Time to RX
16.21 ms
1.21 ms
210 μs
200 μs
NA
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R F 3 1
Current in State
/Mode [μA]
18.5 mA
400 nA
800 nA
600 μA
9.5 mA
10 nA
1 μA
16