SI4431-A0-FM Silicon Laboratories Inc, SI4431-A0-FM Datasheet - Page 104

• 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 1Ah. Low Battery Detector Threshold
Register 1Bh. Battery Voltage Level
Si4431
Reset value = xxx10100
Reset value = xxxxxxxx
104
Name
*Note: The threshold can be calculated as V
Name
Type
Type
Bit
Bit
7:5
4:0
7:5
4:0
Bit
Bit
Reserved
Reserved
vbat[4:0]
lbdt[4:0]
Name
Name
D7
D7
Reserved
Reserved
Reserved.
Low Battery Detector Threshold.
This threshold is compared to Battery Voltage Level. If the Battery Voltage is less than the
threshold the Low Battery Interrupt is set. Default = 2.7 V.*
Reserved.
Battery Voltage Level.
The battery voltage is converted by a 5 bit ADC. In Sleep Mode the register is updated in
every 1 s. In other states it measures continuously.
D6
D6
R
R
D5
D5
threshold
Preliminary Rev. 0.4
= 1.7 + lbdt x 50 mV.
D4
D4
Function
Function
D3
D3
vbat[4:0]
lbdt[4:0]
R/W
D2
D2
R
D1
D1
D0
D0