SI4431-B1-FM Silicon Laboratories Inc, SI4431-B1-FM Datasheet - Page 20

• Manufacturer Part Number: SI4431-B1-FM
• Description: IC TXRX 240-930MHZ -8-13DB 20QFN
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4431-B1-FM

• Package / Case: 20-VQFN
• Mfg Application Notes: Transitioning SI4430/31 to Rev B
• Frequency: 240MHz ~ 930MHz
• Data Rate - Maximum: 256kbps
• Modulation Or Protocol: FSK, GFSK, OOK
• Applications: General Purpose
• Power - Output: 13dBm
• Sensitivity: -121dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 18.5mA
• Current - Transmitting: 30mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• 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: 30 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK, GFSK, OOK
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 4mm
• Product Length (mm): 4mm
• Operating Supply Voltage (min): 1.8V
• Operating Supply Voltage (typ): 3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Si4430/31/32-B1
3.2. Operating Mode Control
There are four primary states in the Si4430/31/32 radio state machine: SHUTDOWN, IDLE, TX, and RX (see
Figure 7). 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
with the exception of SHUTDOWN which is controlled by SDN pin 20. 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 Si4430/31/32 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. The main digital regulator is automatically enabled
in all other modes.
20
Shut Down State
Idle States:
TX State
RX State
Standby Mode
Sleep Mode
Sensor Mode
Ready Mode
Tune Mode
State/Mode
TX
Table 11. Operating Modes Response Time
Figure 7. State Machine Diagram
*Five Different Options for IDLE
16.8 ms
800 µs
800 µs
800 µs
200 µs
200 µs
200 µs
Response Time to
NA
TX
SHUT DWN
SHUTDOWN
Rev 1.1
IDLE*
16.8 ms
800 µs
800 µs
800 µs
200 µs
200 µs
200 µs
RX
NA
Current in State /Mode
30 mA @ +13 dBm
18.5 mA
800 µA
450 nA
8.5 mA
15 nA
1 µA
1 µA
[µA]
RX