si4430 Silicon Laboratories, si4430 Datasheet - Page 20

• Manufacturer Part Number: si4430
• Description: Si4430 Ism Transceiver
• Manufacturer: Silicon Laboratories

Si4430
3.2. Operating Mode Control
There are four primary states in the Si4430 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 chip 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.
20
Shut Down State
Idle States:
TX State
RX State
Standby Mode
Sleep Mode
Sensor Mode
Ready Mode
Tune Mode
State/Mode
xtal
X
0
0
0
1
1
1
1
TX
pll
X
0
0
0
0
1
1
1
Figure 6. State Machine Diagram
Table 11. Operating Modes
*Five Different Options for IDLE
wt
X
X
X
X
X
X
0
1
Preliminary Rev. 0.4
SHUT DWN
LBD or
TS
X
X
X
X
X
IDLE*
0
0
1
16.21 ms
1.21 ms
210 µs
200 µs
200 µs
Response Time to
NA
TX
16.21 ms
1.21 ms
210 µs
200 µs
200 µs
RX
NA
RX
Current in State /Mode
28 mA @ +13 dBm
18.5 mA
600 µA
400 nA
800 nA
9.5 mA
10 nA
1 µA
[µA]