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Si4313-B1
3.2. Operating Mode Control
There are three primary states in the Si4313 radio state machine: SHUTDOWN, IDLE, and RECEIVE. The
SHUTDOWN state is designed to completely shut down the radio to minimize current consumption. There are five
different configurations/options for the IDLE state that can be selected to optimize the Si4313 for the application
requirements.
"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 Si4313 includes a low-power digital regulated supply (LPLDO), which 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, 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.
SHUTDOWN
IDLE*
RX
*Five different options for IDLE
Figure 6. State Machine Diagram
Table 10. Operating Modes Response Time
State Mode
Shut Down State
Idle States
Standby Mode
Sleep Mode
Sensor Mode
Ready Mode
Tune Mode
RX State
Response Time to RX
16.8 ms
800 μs
800 μs
800 μs
200 μs
200 μs
N/A
Rev. 1.0
Current in State/Mode (μA)
15 nA
450 nA
1 μA
1 μA
800 μA
8.5 mA
18.5 mA
19
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