SI4431-B1-FMR Silicon Laboratories Inc, SI4431-B1-FMR Datasheet - Page 17

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

Specifications of SI4431-B1-FMR

• 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
• Package / Case: 20-VQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -

2.1. Operating Modes
The Si4430/31/32 provides several operating modes which can be used to optimize the power consumption for a
given application. Depending upon the system communication protocol, an optimal trade-off between the radio
wake time and power consumption can be achieved.
Table 9 summarizes the operating modes of the Si4430/31/32. In general, any given operating mode may be
classified as an active mode or a power saving mode. The table indicates which block(s) are enabled (active) in
each corresponding mode. With the exception of the SHUTDOWN mode, all can be dynamically selected by
sending the appropriate commands over the SPI. An “X” in any cell means that, in the given mode of operation,
that block can be independently programmed to be either ON or OFF, without noticeably impacting the current
consumption. The SPI circuit block includes the SPI interface hardware and the device register space. The 32 kHz
OSC block includes the 32.768 kHz RC oscillator or 32.768 kHz crystal oscillator and wake-up timer. AUX
(Auxiliary Blocks) includes the temperature sensor, general purpose ADC, and low-battery detector.
*Note: Using Si4430/31 at +13 dBm using recommended reference design.
TRANSMIT
STANDBY
RECEIVE
SENSOR
TUNING
READY
SLEEP
SHUT-
DOWN
Name
Mode
OFF (Register
contents lost)
ON (Register
Digital LDO
retained)
contents
OFF
SPI
ON
ON
ON
ON
ON
ON
ON
32 kHz OSC
Table 9. Operating Modes
OFF
OFF
ON
X
X
X
X
X
Circuit Blocks
Rev 1.1
AUX
OFF
OFF
ON
X
X
X
X
X
30 MHz
XTAL
OFF
OFF
OFF
OFF
ON
ON
ON
ON
Si4430/31/32-B1
OFF
OFF
OFF
OFF
OFF
PLL
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
PA
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
RX
18.5 mA
30 mA*
450 nA
800 µA
8.5 mA
15 nA
1 µA
1 µA
I
VDD
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