SI4431-A0-FM Silicon Laboratories Inc, SI4431-A0-FM Datasheet - Page 119

• 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

Register 34h. Preamble Length
Register 35h. Preamble Detection Control 1
Reset value = 00001000
Reset value = 00101010
Name
Name
Type
Type
Bit
Bit
7:0
7:3
2:0
Bit
Bit
rssi_offset[2:0] rssi_offset[2:0]
prealen[7:0]
preath[4:0]
Name
Name
D7
D7
Preamble Length.
The value in the prealen[8:0] register corresponds to the number of nibbles (4 bits) in the
packet. For example prealen[8:0] = ‘000001000’ corresponds to a preamble length of 32
bits (8 x 4bits) or 4 bytes. The maximum preamble length is prealen[8:0] = 111111111
which corresponds to a 255 bytes Preamble. Writing 0 will have the same result as if writ-
ing 1, which corresponds to one single nibble of preamble.
Number of nibbles processed during detection.
Value added as offset to RSSI calculation. Every increment in this register results in an
increment of +4 dB in the RSSI.
D6
D6
preath[4:0]
R/W
D5
D5
Preliminary Rev. 0.4
D4
D4
prealen[7:0]
R/W
Function
Function
D3
D3
D2
D2
rssi_offset[2:0]
R/W
D1
D1
Si4431
D0
D0
119