SI4431-A0-FM Silicon Laboratories Inc, SI4431-A0-FM Datasheet - Page 21

• Manufacturer Part Number: SI4431-A0-FM
• Description: IC TXRX ISM 930MHZ 3.6V 20-QFN
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4431-A0-FM

• Package / Case: 20-QFN
• Mfg Application Notes: Transitioning SI4430/31 to Rev B
• Frequency: 240MHz ~ 930MHz
• Data Rate - Maximum: 128kbps
• Modulation Or Protocol: FSK, GFSK, OOK
• Power - Output: 13dBm
• Sensitivity: -118dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 18.5mA
• Current - Transmitting: 28mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Number Of Receivers: 2
• Number Of Transmitters: 1
• Wireless Frequency: 240 MHz to 930 MHz
• Output Power: 13 dBm
• Operating Supply Voltage: 1.8 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Supply Current: 28 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK, GFSK, OOK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Memory Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant
• Other names: 336-1633-5

3.2. Operating Mode Control
There are four primary states in the Si4431 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.
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]
Si4431
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