si4330 Silicon Laboratories, si4330 Datasheet - Page 18

• Manufacturer Part Number: si4330
• Description: Si4330 Ism Receiver
• Manufacturer: Silicon Laboratories

Si4330
3.2. Operating Mode Control
There are three primary states in the Si4330 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.
18
Shut Down State
Idle States:
RX State
Standby Mode
Sleep Mode
Sensor Mode
Ready Mode
Tune Mode
State/Mode
xtal
X
0
0
0
1
1
1
SHUT DWN
pll
X
0
0
0
0
1
1
Figure 6. State Machine Diagram
wt
X
X
X
X
X
0
1
Table 10. Operating Modes
*Four Different Options for IDLE
LBD or TS Response Time to RX Current in State /Mode [µA]
Preliminary Rev 0.2
X
X
X
X
0
0
1
IDLE*
16.21 ms
1.21 ms
210 µs
200 µs
NA
RX
18.5 mA
400 nA
800 nA
600 µA
9.5 mA
10 nA
1 µA